Navajo Unit April Operations Meeting Minutes and Slides — Reclamation #SanJuanRiver #ColoradoRiver #COriver #aridification

Aerial view of Navajo Dam and Reservoir. Photo credit: USBR

From email from the Western Colorado Area Office:

April 26, 2024

Please see the links below for the Meeting Summary and Slides from the April Operations Meeting of the Navajo Unit. 

Meeting Summary: https://www.usbr.gov/uc/wcao/water/rsvrs/mtgs/pdfs/archives/nm2024_04.pdf

Meeting Slides: https://www.usbr.gov/uc/wcao/water/rsvrs/mtgs/pdfs/archives/nmho2024_01.pdf

Arizonans Celebrate #ColoradoRiver Tribes’ Landmark Water Agreement — #Arizona Department of Water Resources #COriver #aridfication

Amelia Flores, chairwoman of the Colorado River Indian Tribes. (Source: CRIT)

Click the link to read the article on the Arizona Department of Water Resources website:

April 26, 2024

Arizona’s Governor and ADWR Director joined with the Colorado River Indian Tribes and top federal officials on Friday in signing documents implementing an agreement allowing the tribes to market portions of their Colorado River allocation to water users off-reservation.

The signing event represents a critical step to implement the Colorado River Indian Tribes Water Resiliency Act of 2022.

Present at the event to execute the agreements at the Bluewater Resort on the CRIT reservation near Parker were Arizona Governor Katie HobbsU.S. Senator Mark Kelly of Arizona, as well as Secretary of the Interior Deb HaalandBureau of Reclamation Commissioner Camille Calimlim Touton and Tom Buschatzke, Director of the Arizona Department of Water Resources.

Both Governor Hobbs and Director Buschatzke participated in the signing ceremony.

In her remarks at the event, Governor Hobbs gave a gracious nod to Director Buschatzke “and your entire team” for the Department’s years of effort to help make the marketing agreements a reality.

From left: ADWR Director Tom Buschatzke, Bureau of Reclamation Commissioner Camille Calimlim Touton, and U.S. Sen. Mark Kelly. Photo credit: Arizona Department of Water Resources

“Director Buschatzke, I feel like this is the 100th time I’ve said this since I took office, but we are lucky to have you leading the Arizona Department of Water Resources and I want to thank you and your entire team who have spent years working on this,” the Governor said.

According to a statement released by the tribes, the agreements signed on Friday “will move CRIT one step closer to strengthening its sovereignty over its water resources to improve the lives of future generations of CRIT members while protecting the life of the river.”

Governor Hobbs observed that the agreements bring an end to “an outdated framework” that restricted the tribes from making choices about allocating their own water resources.

“The celebration today is the beginning of a new chapter for tribal sovereignty and self-determination, where tribal leaders have the freedom to manage their resources, and by extension, their futures,” said Governor Hobbs.

She also noted the important role the tribes played “as a partner in protecting the Colorado River” when they participated in the 2019 Drought Contingency Plan to help stabilize Lake Mead.

The CRIT reservation stretches along the Colorado River on both the Arizona and California side. It includes approximately 300,000 acres, with the river serving as the focal point and lifeblood of the area.

Native America in the Colorado River Basin. Credit: USBR

A Future for Birds and People in the #ColoradoRiver Basin: Audubon and partner NGOs propose an alternative for post-2026 operations — Audubon #COriver #aridification

Adult Yellow-billed Cuckoo. Photo: Andy Reago and Chrissy McClarren/Flickr (CC-BY-2.0)

Click the link to read the release on the Audubon website (Jennifer Pitt):

March 29, 2024

Audubon has joined partner conservation organizations to propose “Cooperative Conservation” as an alternative for the federal Bureau of Reclamation (Reclamation) to study as they consider how to manage the Colorado River after 2026, when current management rules expire. Reclamation has initiated a process expected to assess multiple alternatives before they establish new operational rules.

In recent weeks the Upper Basin (Colorado, New Mexico, Utah and Wyoming) and Lower Basin (Arizona, California and Nevada) have each submitted proposals of their own. They appear to be in broad agreement that Colorado River water uses need to be reduced, not only because the Colorado River’s water is over-allocated, but also because climate change is shrinking the river. But alignment between the Upper Basin and Lower Basin ends there, with significant dispute over whose water uses should be reduced.

Cooperative Conservation has a different focus. It prioritizes stabilizing the Colorado River water supply, provides opportunities to make management more equitable, and creates mechanisms to improve environmental outcomes [ed. emphasis mine]:

  • Water supply reliability would be improved by consideration of recent trends as well as assessing the health of the entire system, departing from the current operations that have not kept up with changing conditions such that in 2022 federal managers were worried about the continued ability release water through the dams.
  • Ecosystem health would be addressed with stewardship and mitigation provisions. Today’s operations are based on a policy framework that has not prioritized Colorado River habitats, leaving many used by birds such as Yuma Ridgeway’s Rails and Yellow-billed cuckoos degraded and vulnerable.
  • Colorado River Delta habitats and flows have been restored in recent United – States Mexico agreements, and the opportunity for future binational agreements to extend and expand commitments to these resources would be preserved. Most of Colorado’s Delta was desiccated as the river was developed through the 20th century, and these agreements have developed a path towards restoring some of what was lost.
  • Conservation Reserve program to incentivize water conservation, that improves on the current system of “Intentionally Created Surplus” by adding to the stability of water supplies, offering an opportunity for state and federal governments to forge an agreement with Colorado River Basin Tribes looking to realize greater benefits from their water rights, and create ecological benefits through flexible management that puts water where it is needed in the Colorado River.

These innovations could help the diversity of birds and wildlife and more than 35 million people who depend on the Colorado River. But Reclamation will not be able to move forward with them if the states cannot answer important questions about who should reduce water uses to bring demands into balance with supplies. Without consensus, Colorado River management could be headed to the courts, and opportunities for improved management will be lost. We remain optimistic that over the coming months the states will negotiate a solution, and urge them to recognize that reaching agreement on how to share water shortages is essential.

In the meantime, Audubon will be promoting Cooperative Conservation and all that it offers. Reclamation is expected to publish their analysis of Colorado River management alternatives by the end of 2024.

DOWNLOADABLE RESOURCES

Cooperative Conservation Alternative 20240329.pdf

Map credit: AGU

New Agreement to Improve River Flows in Grand County — @Northern_Water

Willow Creek, at the headwaters of the Colorado River, on April 2, 2021. Photo/Allen Best

Here’s the release from the Northern Colorado Water Conservancy District (Christine Travis and Jeff Stahla):

April 23, 2024

Grand County and Northern Colorado Water Conservancy District (Northern Water) have agreed to a unique and first-of-its-kind Operational Framework that provides Grand County with the ability to have as much as 7,000 acre-feet of additional controllable water to release from the Colorado-Big Thompson (C-BT) Project for stream enhancement and other purposes that will benefit Grand County’s recreation and agriculture industries. The volume available for streamflow improvement will be dependent on annual river conditions and C-BT Project storage levels.

Approved Tuesday [April 23, 2024] by the Grand County Commissioners, the agreement outlines a methodology to determine the water that will be available to the County each year. Water made available under this agreement to the County will be released to Willow Creek, or to the Colorado River, will supplement existing flows, and could accumulate to nearly 40,000 acre-feet over the course of a decade. Prior to 2005, this water was used for irrigation of hay fields near the Town of Granby. Since that time, the underlying lands have been removed from agricultural production and converted to residential and commercial development. Without this agreement, the water will continue to be captured by the C-BT Project and available to Northern Water for uses in Northeastern Colorado.

“The Operational Framework Agreement will provide the County with an additional water management tool to improve and enhance flows on the Colorado River,” said Grand County Commissioner Chair Merrit Linke. “The Colorado River is the life blood to sustaining our agriculture and recreation industries that are critically important to our local economy as well as all of the West Slope.”

Grand County and Northern Water will, in coming months, consult and coordinate with the U.S. Bureau of Reclamation regarding the implementation of the agreement.

New #ColoradoRiver proposals put environmental needs front and center in deciding river’s future — Fresh Water News #COriver #aridification

Colorado River. Photo credit: Abby Burk via Audubon Rockies

Click the link to read the article on the Water Education Colorado website (Shannon Mullane):

April 17, 2024

Environmental groups and water experts say the U.S. Bureau of Reclamation should give nature a say in how it manages the Colorado River for years to come.

In March, seven states, including Colorado, released two competing proposals for how to manage two enormous reservoirs in the Colorado River Basin and make painful decisions about cutting back on water use once current operating rules expire in 2026.

But they’re not the only ones throwing out ideas: Water experts and environmental advocates have submitted two proposals of their own. They want to make sure endangered fish, Grand Canyon ecosystems, and more aren’t left out of the conversation.  

The experts hope their proposals, which highlight changing climate data and environmentally focused reservoir releases, help inform the Bureau of Reclamation’s final report for how the river should be managed after 2026. A draft of that report is expected in December.

“If you don’t care about the environment, then the whole system crashes,” said John Berggren, a regional policy manager with Western Resource Advocates. “That’s not to say the environment takes priority over water supply and other issues, but rather they can be integrated.”

The current operating rules, established in 2007, focus on how water is stored in Lake Powell on the Utah-Arizona border, released to Lake Mead on the Nevada-Arizona border, and then released to millions of water users in the Lower Basin states of Arizona, California and Nevada.

Together, lakes Powell and Mead make up about 92% of storage capacity, about 58.48 million acre-feet, in the Colorado River Basin. Both are about one-third full.

One acre-foot roughly equals the annual water use of two to three households.

High-stakes negotiations stalled early this year with states at loggerheads over how to share water cuts. The four Upper Basin states — Colorado, New Mexico, Utah and Wyoming — only included cuts to the Lower Basin’s water use, although the states promised to pursue voluntary conservation programs. The three Lower Basin states called on all seven states to make cuts when the amount of available water falls below 38% of the total capacity in seven federal reservoirs.

Several tribal nations submitted their own proposal to advocate for tribal water rights in the federal process.

These proposals have the potential to impact water users across the basin, which provides water to 40 million people, more than 5 million acres of farmland, two states in Mexico, and cities including Los Angeles, Las Vegas, Phoenix and Denver.

One perspective all of the proposals have in common: The status quo operations aren’t going to work in the future.

“We need to use less water, and there’s going to be shortages for the Colorado River going forward,” Berggren said. “We wanted ours to focus more on how to integrate environmental considerations regardless of who’s taking shortages.”

Giving nature a seat at the table

Neither proposal from the basin states places a heavy emphasis on incorporating environmental concerns into how lakes Powell and Mead are managed, and there are plenty of environmental hotspots in the basin.

The Grand Canyon sits below Lake Powell, and its ecosystems and landscape can be helped or hurt by the reservoir’s releases. In 2011, water officials released an 11 million-acre-foot surge of water into the canyon — the right amount of water according to the current rules — that was too big and ended up eroding sandbars where people camp and view the national park. That sand is hard to replace since most of the Colorado River’s sediment is trapped in Lake Powell.

The Upper Colorado River Endangered Fish Recovery Program is trying to boost endangered fish populations in the face of growing numbers of predatory, invasive fish. The Salton Sea in California is shrinking, exposing dry shorelines with toxic dust particles to the wind. The once-vibrant ecosystem in the Colorado River Delta, where the river meets the Gulf of California, is now diminished.

With these areas in mind, one environmental proposal advocates for linking environmental priorities to how the reservoirs operate. It also suggests using updated climate data, in addition to reservoir storage, to determine releases from lakes Mead and Powell.

This proposal was put forward by Western Resource Advocates, Audubon, American Rivers, Environmental Defense Fund, The Nature Conservancy, Trout Unlimited and the Theodore Roosevelt Conservation Partnership.

Since 2007 under the current guidelines, when the water in lakes Mead and Powell dropped to pre-decided water levels, officials knew to release a predetermined amount of water.

Another environmental proposal suggests a more flexible approach: On an annual basis, the secretary of the Interior would decide how much water to release from Lake Powell based on the environmental, recreational, water supply and hydropower goals for that year — rather than using a fixed rule for years to come.

This adaptive-management proposal was submitted by well-recognized Colorado River experts Jack Schmidt, former chief of the federal Grand Canyon Monitoring and Research Center; Eric Kuhn, former Colorado River District general manager and author of “Science be Dammed”; and Kuhn’s co-author John Fleck, a journalist-turned academic at the Utton Transboundary Resources Center at the University of New Mexico School of Law.

“What I have learned in a 40-year career in the Grand Canyon is that scientific understanding evolves, changes and improves,” said Schmidt, currently the director of the Center for Colorado River Studies at Utah State University. “Going forward, we’re making a mistake to define hard and fast rules for what the releases from Lake Powell to Lake Mead would be.”

Big ideas and key questions

Environment and water experts say they are mainly trying to elevate their concerns and the role of nature in the federal process. When it comes to the nitty-gritty, however, each of the proposals raises some key questions for other Colorado water experts.

The joint environmental proposal, which Berggren helped with, identifies several environmental hotspots, like the Grand Canyon, Salton Sea and endangered fish programs, and proposes incorporating them into how lakes Mead and Powell are managed in the future.

For example, the post-2026 operating rules could include minimum flows from Powell into the Grand Canyon of 4.34 million acre-feet per year to ensure that ecosystems, from the lower canyon’s Sonoran Desert to the North Rim’s coniferous forest, stay healthy.

“You incorporate environmental considerations, and suddenly you have a more healthy, flowing Colorado River, which allows the basin states to have a more reliable water supply,” Berggren said.

But incorporating so many different environmental concerns in one document was a big “red flag” for Jennifer Gimbel, a senior water policy scholar at the Colorado Water Center and former deputy commissioner for the Bureau of Reclamation.

How officials manage each of these environments is tied to years of work by programs, rulemaking documents, legislation and more. Reservoir releases that aim to help the environment are often wrapped into established rules that govern how each reservoir operates.

“That is one scary document if we’re looking at how to manage everything on the river,” Gimbel said. “I’m not sure how practical they are with trying to move that forward.”

The environmental groups’ joint proposal also suggested that officials look at both total reservoir storage and updated climate data to guide operations at lakes Mead and Powell.

The climate data would come from a federal three-year climate model that factors in temperature, precipitation, snow and more to guide operations at lakes Mead and Powell. The total reservoir storage would be based on the amount of water stored in seven reservoirs, including federal reservoirs in the Upper Basin such as Flaming Gorge, Blue Mesa and Navajo reservoirs. That’s similar to the Lower Basin states’ proposal.

Considering both factors together would help avoid unreliable forecasting and adjust to changing conditions, according to the proposal. Upper Basin reservoirs would help with calculations but would not be used to move water from one reservoir to another, Berggren emphasized.

But including Upper Basin reservoirs in how lakes Mead and Powell operate is a flashpoint in the Colorado River negotiations.

Officials like Becky Mitchell, Colorado’s top Colorado River negotiator, have been fighting attempts to include these reservoirs in the operations for Lake Powell and Lake Mead. Flaming Gorge and Blue Mesa, Colorado’s largest reservoir, had to release water to boost Lake Powell’s historically low water levels in 2021, and then Flaming Gorge released more in 2022.

“These reservoirs are not intended to protect Lake Mead or provide for additional Lower Basin supply, but are for Upper Basin uses and environmental flows, among other purposes,” Mitchell said in a written statement, adding that her team was still analyzing the proposal. “They are also essential to the success of the recreational and tourist economies in the region.”

Considering both factors together would help avoid unreliable forecasting and adjust to changing conditions, according to the proposal. Upper Basin reservoirs would help with calculations but would not be used to move water from one reservoir to another, Berggren emphasized.

But including Upper Basin reservoirs in how lakes Mead and Powell operate is a flashpoint in the Colorado River negotiations.

Officials like Becky Mitchell, Colorado’s top Colorado River negotiator, have been fighting attempts to include these reservoirs in the operations for Lake Powell and Lake Mead. Flaming Gorge and Blue Mesa, Colorado’s largest reservoir, had to release water to boost Lake Powell’s historically low water levels in 2021, and then Flaming Gorge released more in 2022.

“These reservoirs are not intended to protect Lake Mead or provide for additional Lower Basin supply, but are for Upper Basin uses and environmental flows, among other purposes,” Mitchell said in a written statement, adding that her team was still analyzing the proposal. “They are also essential to the success of the recreational and tourist economies in the region.”

The three water experts’ proposal says the post-2026 rules should include instructions on how to reduce water use when available water is unusually low. But the rules should not include prescriptive annual releases from Lake Powell.

“Because the science on which those rules were developed is going to change in the next 20 years, and then you’re going to have to renegotiate the whole damn thing again,” Schmidt said.

Instead, the annual releases from Powell can fluctuate, as long as they comply with water law. For example, instead of releasing too much water from Powell because the rules say so — and harming the Grand Canyon’s landscape in the process — the Secretary of the Interior could have more flexibility to decide how much water to release.

Deciding releases annually, instead of setting up fixed rules, has caused other water officials to balk, according to Schmidt.

“I have already had behind-the-scenes, off-the-record conversations with some state people, and they basically said, ‘you’re out of your mind. We need certainty,’” he said.

But if water managers do not create rules that are flexible enough to adapt to changing conditions in the river basin, they will continue to run into problems, Schmidt said.

“How do you incorporate flexibility in a water supply negotiation that seeks certainty?” he said. “That is the fundamental problem.”

Map credit: AGU

What Happens if there is no Agreement on Post-2026 #ColoradoRiver Operations? — Eric Kuhn (InkStain.net) #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Click the link to read the article on the InkStain.net website (Eric Kuhn):

April 15, 2023

Given how far apart the competing proposals from the Colorado River Upper and Lower Division States are, a legitimate question is – “what happens if we get to the summer of 2026 and there is still no agreement on the post-2026 operational guidelines?” Well, believe it or not, that is a question upon which the seven basin states and the Secretary of the Interior already agree.  The Upper Division States made the following comment in their proposal:

The language quoted by the Upper Division States letter comes from the Record of Decision (RoD) for 2007 Interim Guidelines (Section 8. C.). This termination language was included with the consent of the states. So, the obvious questions are – if the operating criteria are to revert to the LROC, what are the LROC, and what specifically do they mean for the operation of Lakes Mead and Powell?

WHAT IS THE LROC?

The long-range coordinated operating criteria or “LROC” are a requirement of the 1968 Colorado River Basin Project Act, the federal legislation that, among many other things, authorized the Central Arizona Project (CAP). Prior to the creation of the 2007 Interim Guidelines for the coordinated operation of Glen Canyon and Hoover dams, the LROC created the framework for determining how much water to release from Lake Powell to Lake Mead each year.

The 60s were a turbulent decade for the Colorado River Basin.  In 1962 Flaming Gorge and Navajo Reservoirs began filling, then in 1963, Lake Powell began filling. To manage the filling of over 30 million acre-feet of vacant space (25 maf in Lake Powell), in 1962 the Secretary issued filling criteria. And, as luck would have it, the 1960s were relatively dry. The filling criteria were controversial in both basins. A significant concern was power generation. The Upper Basin wanted to fill the reservoirs as fast as possible so the Upper Basin fund would begin accruing revenues that would be used to subsidize irrigation projects under the 1956 Colorado Storage Project Act. The Lower Basin was concerned with the impact of power generation at Hoover Dam – the revenues from which were being used to repay the federal treasury for Hoover Dam and other projects on the lower river.

The Upper Division States became concerned that the Lower Division States would continually interfere with the storage of water in the Upper Basin Reservoirs using Article III(e) of the Colorado River Compact, which states:

The Upper Division States (via the UCRC) decided they needed to use the federal legislation then pending before Congress to authorize the CAP to clarify the rules under which water would be stored and released from Lake Powell and the other CRSP storage reservoirs. A critical question that needed to be answered was how much holdover storage the Upper Division States would need to meet their compact obligations under Articles III(c) and III(d) of the compact. This was a difficult question to answer given that the two basins had very different interpretations of these provisions, especially the obligation off the Upper Division States to Mexico under the 1944 Treaty. Today the two basins still have very different interpretations of these provisions.

The specific language of Section 6 of the 1968 Act was negotiated by the states with input from Reclamation. With Congressman Aspinall (the House Interior and Insular Affairs Committee Chair from Western Colorado) insisting that operating language be included in any legislation, the UCRC had the better hand. Colorado’s Felix Sparks (its CWCB Director and UCRC Commissioner) said “we wrote every word of Section 6.”

The requirement for the LROC is included in Section 602(a):

Section 602(b) required that the Secretary submit draft criteria to the states by January 1, 1970, and, after receipt of comments, adopt criteria by July 1, 1970.

The language of the first two priorities for releases from Glen Canyon Dam appears straight forward, but there are still implementation questions. The first priority is to release water to meet the obligation of the Upper Division States to Mexico, if any. Today, the Upper Division States believe they have no obligation to Mexico, but the Lower Division States believe it’s at least 750,000 af per year. Thus, lacking either an agreement among the states or an interpretation of Article III(c) by the Supreme Court, this priority is unquantified. The second priority is to meet the Upper Division State’s 75 maf every ten years non-depletion obligation under III(d). It’s an average of 7.5 maf per year, but the language does not require a specific flow amount in any one year. To add uncertainty, the Upper Division States believe that if climate change, not Upper Basin depletions, is a cause of ten-year flows falling below 75 maf, there is no violation of Article III(d).

The third priority is more complicated (perhaps convoluted). It’s designed to address the question of how much holdover storage the Upper Basin can keep in the Lake Powell and the other CRSP reservoirs. Although the language may be confusing, the intent is simpler. The Upper Basin may keep as much storage as the Secretary determines necessary to allow the States of the Upper Division to meet their compact obligations during the most critical drought of record. If there is more than that amount in storage, then they must share the extra water with the Lower Basin, but only to the extent necessary to equalize active storage in Lakes Mead and Powell. Thus, was borne the term “equalization.”

A deck of punched cards comprising a computer program. The red diagonal line is a visual aid to keep the deck sorted. By ArnoldReinhold – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16041053

After the 1968 Act passed, the Department of the Interior immediately began an effort to prepare a draft LROC. The effort involved a federal-state task force. It also involved the first comprehensive use of a computer to simulate numerous different reservoir operational scenarios (I wonder how many of us still remember the days of computer punch-card decks?). Interior officials quickly realized that the effort was going to be complicated and contentious. For Interior’s version of the events, see Chapter VII of the 1978 version of the Hoover Dam Documents. The contentious issues were the annual release amount from Glen Danyon Dam and how to calculate the amount of allowable holdover storage (now commonly referred to as “602(a) storage”). Colorado’s Felix Sparks put it this way: “Everything we do at Glen Canyon Dam is ultimately about the Colorado River Compact.”

After numerous meetings and conferences, on June 9, 1970, Secretary Walter Hickel formally approved the first LROC. Much of the language parroted the 1968 Act provisions for the CRSP reservoirs and for Lake Mead, the language of the 1964 decree implementing the 1963 decision in Arizona v. California. For the Upper Division States, however, the Secretary made three decisions that they strongly opposed. First, the LROC included a provision for an annual “minimum objective release” from Glen Canyon Dam of 8.23 maf. The problem was that this number was derived as 7.5 maf plus 750 kaf (the LB’s interpretation of the UB’s Mexican Treaty obligation) less 20 kaf (the mean flow of the Paria River). The Secretary accepted recommendations from the UCRC for language clarifying that the minimum objective release was an “objective” not a “requirement” and that the Secretary was not interpreting the Compact. The second problem was that the Secretary rejected their recommendation that a probability rule curve be used to set the 602(a) level.  Instead, the Secretary determined that the 602 (a) level would be set on an annual basis. Finally, with the adoption of the LROC, the UCRC recommended that the lake Powell filling criteria be terminated. The problem with the filling criteria from the Upper Division States perspective was that it required revenues from power generation at the CRSP units be used to keep the Lower Basin whole for the impact of filling Lake Powell on power generation at Hoover Dam. The Secretary rejected this recommendation and the filling criteria stayed in effect through 1980.

The rejection of its important recommendations left the UCRC members bitter. New Mexico State Engineer and UCRC Commissioner, Steve Reynolds, put in his plain-spoken language – “they crammed it down our throats” (expletive deleted).

SO WHAT HAPPENS IF WE CONTINUE TO USE THE LROC?

So, the big question is – if there is no agreement on post-2026 operating guidelines between the basins and the Secretary determines that the annual operation of Lakes Mead and Powell for Water Year 2027 (and perhaps beyond) will be guided by the LROC, what does this mean for the reservoirs?  For Lake Powell, the answer may be not much. It means an annual release of 8.23 maf (or perhaps 8.1 maf -taking into account the river inflows immediately below the dam). Depending on the runoff in 2025 and 2026, there’s a reasonable chance that this would be the amount released under a continuation of the 2007 Interim Guidelines. The differences are that there would be no balancing of the storage levels in Lakes Mead and Powell as is allowed by the three balancing tiers of the 2007 Interim Guidelines and if the next two years are dry, there could be some debate over whether the Secretary has the authority to reduce releases below 8.23 maf – something that might be needed given the need to protect elevations below 3,500 feet at Lake Powell because of concerns about use of its outlet works.. I believe the answer to this question is clearly yes. In a June 2, 2005, letter, Secretary Norton wrote “the Department retains the authority pursuant to applicable law and the Operating Criteria to adjust releases from Glen Canyon Dam to amounts less than 8.23 million acre-feet per year. Specifically, the Department transmitted the following statement to the Governors of each of the Colorado River Basin States on June 9, 1970: “…(T)he operating Criteria imposes no firm or fixed obligation the 8.23 million acre-feet be released each year from lake Powell. That quantity is stated as an “objective” ….”

As for releases greater than 8.23 maf, under the authority referenced in the June 2, 2005, letter the Secretary might also have the authority to increase releases.  The LROC, however, anticipated that the occasional releases greater than 8.23 maf would be made as equalization releases under the Section 602(a)(iii) third priority. The LROC provides that the Secretary determines the equalization or 602(a) storage level annually, but it appears that in the near to mid-term future, there is very little risk that the storage level in Lake Powell will be anywhere near a level that would require a large equalization release (as happened in 2011). Based on the table in the 2007 Interim Guidelines, the end of water year elevation of Lake Powell would have to exceed 3666’ (100’+ higher, or 10+ maf more than the current level). Further, I would argue that the 3666’ level is no longer current. It assumed that 1954-65 was the critical drought. The recent 2000-2022 drought is every bit as dry and twice as long as the 1954-65 drought, therefore, a better estimate of today’s 602(a) level is “all of the available CRSP storage plus a lot more.” The Upper Division State’s proposal, in fact, does not even include an equalization provision.  Furthermore, in separate studies in 1969 and 2004, Reclamation concluded that in the future, the 602(a) level would exceed the available CRSP storage capacity. This is one of the reasons that in 1970, the Secretary rejected the rule curve. Reclamation modelling concluded that with future Upper Basin development, the result of applying the UCRC’s proposed rule curve (98.4%) meant that all available CRSP storage was needed to protect the Upper Basin. For more information on “602(a),” see Reclamation’s 2004 Environmental Assessment on this subject. The Upper Basin depletions have not achieved the level of development anticipated in either 1969 or 2004, but natural flows have been far less. From Lake Powell’s perspective there is no difference between upstream depletions and climate change caused reductions in natural flow.

For Lake Mead, operating under the LROC may be more complicated. The “70R” criteria is a flood control strategy for Lake Mead. Given the current reservoir levels, the chances of encroaching on the flood control space in Lake Mead is very small. The most pressing problem would be that after the termination of the 2007 Interim Guidelines, there would be no “current” guidance on the specifics of when and how much for the shortage levels that would still need to be imposed on Lower Basin mainstem users in 2027 and beyond.  Under the 1964 Decree, however, the Secretary has the clear authority, if not a mandate, to set shortages. I think it’s likely that the Secretary and three Lower Division States would agree on Lake Mead deliveries. A more difficult question may be the level of the annual deliveries to Mexico. If there is no internal U.S. agreement on the post-2026 guidelines, will Mexico be interested in extending Minute 323?

Operating under the LROC might be manageable

The bottom line is that if there is no agreement among the Basin States for consensus post-2026 operating guidelines, it may not be the ideal outcome the states want but given the broad authority and flexibility the Secretary has under the 1970 LROC, the situation would be manageable. In fact, operating Lake Mead and Lake Powell under the flexibility provided by the 1922 Compact, Section 602 of the 1968 Act, and the 1970 LROC might provide opportunities for a more flexible management approach that can be designed to address a broader range of issues, including balancing recreation resources, and addressing environmental conditions in the Grand Canyon.

Map credit: AGU

Problems with #GlenCanyon Dam could jeopardize water flowing to Western states — The #Utah News-Dispatch

November 2012 High Flow Experiment via Protect the Flows

Click the link to read the article on the Utah News-Dispatch website (Kyle Dunphey):

April 12, 2024

A new memo from the U.S. Bureau of Reclamation is raising concern about the infrastructure at the Glen Canyon Dam and its ability to deliver water downstream should levels at Lake Powell continue to decline. 

Environmental groups are calling it “the most urgent water problem” for the Colorado River and the 40 million people who rely on it. 

Water stored at Lake Powell, the country’s second largest reservoir, typically moves through the Glen Canyon Dam hydropower turbines — the Glen Canyon Power Plant produces about 5 billion kilowatt hours of power each year, distributed to Utah, Wyoming, Colorado, New Mexico, Arizona, Nevada and Nebraska, according to the Bureau of Reclamation. 

Below the turbines are the dam’s river outlet works, a separate set of steel pipes originally designed to release excess water. If Lake Powell were to drop below the elevation of 3,490 feet, the outlet works would be the only way to convey water through the dam and downstream to the 30 million people and billion-plus dollar industries that rely on the lower Colorado River basin. 

In February 2023, lake levels reached an all-time low of 3,521.95 feet, nearly 30 feet away from forcing the bureau to use the outlet works.

The back of Glen Canyon Dam circa 1964, not long after the reservoir had begun filling up. Here the water level is above dead pool, meaning water can be released via the river outlets, but it is below minimum power pool, so water cannot yet enter the penstocks to generate electricity. Bureau of Reclamation photo. Annotations: Jonathan P. Thompson

But a March 26 memo from the Bureau of Reclamation suggests those outlet works aren’t as reliable as previously thought. 

“There are concerns with relying on the river outlet works as the sole means of sustained water releases from Glen Canyon Dam,” the memo reads, noting that the bureau should “not rely” on the outlet works to release water downstream. 

Without upgrades to the dam’s infrastructure, the bureau’s ability to get water downstream to the lower Colorado River basin as required by the Colorado River Compact could be in jeopardy. Even after record-breaking snowfall in 2023 and an above average 2024 winter, Lake Powell remains at about 32% full, according to data from the bureau. And scientists estimate flows in the river have decreased by roughly 20% over the last century, with warming temperatures resulting in a 10% decrease in runoff. 

“We call this the biggest problem in the Colorado River basin,” said Zach Frankel, executive director of the Utah Rivers Council. “What is the chance Lake Powell drops below the hydropower turbine level in the next 10 years? If you ask me, I would say it’s almost guaranteed. We just had the biggest runoff in 40 years in the Colorado River basin a year ago. It’s only been a year since the biggest runoff in almost four decades and Lake Powell is still only at 32% capacity.” 

The Colorado River is pictured near Moab on Sunday, Feb. 18, 2024. (Photo by Spenser Heaps for Utah News Dispatch)

The Bureau of Reclamation’s findings come after officials recently used the outlet works to deliver more water downstream, an effort to boost ecosystems and study the ecology and hydrology of the Colorado River. The outlet works experienced cavitation, which according to the bureau, is a result of bubbles forming in high velocity flows that can damage or erode coatings, concrete and steel. Repairs could include adding a new epoxy lining to the outlet works, which the bureau has scheduled for later this year. Or even a river-level bypass system, which the Utah Rivers Council has advocated for, allowing water to flow around the dam. 

“If we drop everything to solve it, the solution will still take 10 years to implement — so why are we procrastinating?” said Eric Balken, the executive director of Glen Canyon Institute.

The cavitation means the outlet works currently can’t sustain the volume of water required to pass through the dam and deliver the roughly 9 million acre-feet of water allocated to California, Arizona, Nevada and Mexico, should Lake Powell drop below 3,490 feet. 

And if the lower basin doesn’t get its water, it could unravel an already tense situation in the drought-plagued region. Frankel said it could lead to litigation among states, the lower basin demanding the upper basin make substantial cuts, or a depletion of reservoirs in Utah and other upper basin states. The economic impact of not delivering water to the lower basin could have far-reaching ripple effects, possibly reducing agricultural production, impacting urban growth and damaging recreation. 

“This is a big problem that 1 in 8 Americans needs to have resolved,” Frankel said. 

Water managers from Colorado River basin states are currently working on new management plans ahead of 2026, when current guidelines are set to expire. The states have yet to reach an agreement, but Kyle Roerink, executive director of the Great Basin Water Network, said the issues identified at the Glen Canyon Dam should be a part of the planning process. 

“The Bureau has procrastinated solving Glen Canyon Dam’s plumbing problems long enough. This urgent problem needs to be solved ASAP, during the current Interim Guideline process,” Roerink said in a statement. 

Navajo Unit Coordination Meeting April 23, 2024 — Reclamation

The Loss of El Vado Dam — John Fleck (InkStain.net) #RioGrande

El Vado Dam and Reservoir. Photo credit: USBR

Click the link to read the article on the InkStain website (John Fleck):

April 10, 2024

The Bureau of Reclamation’s announcement at Monday’s meeting of the Middle Rio Grande Conservancy District that it is halting work on El Vado Dam repairs raises hugely consequential questions about water management in New Mexico’s Middle Rio Grande Valley.

The short explanation for the halt is that the current approach to repairing the 1930s-era dam wasn’t working. (The meeting audio is here, though at “press time” for this blog post this week’s is not yet up.) I’ll leave it to others to suss out the technical and bureaucratic details of the repair project, and the endless finger-pointing that’s sure to ensue. My interest here is to begin to sketch out the implications here in the Middle Valley of an indefinite period – a decade or more? – without El Vado.

The Middle Rio Grande Conservancy District built El Vado (with substantial federal subsidy) in the 1930s to provide irrigation supplies by storing high spring runoff for use in summer and fall. But while its purpose was irrigation, it completely changed the Middle Valley hydrograph in ways that all the other water uses have adapted to, both human and ecosystem.

Without El Vado (or some interim replacement – see below), we should expect the Rio Grande to routinely go functionally dry in late summer unless propped up by monsoon rains, which are sporadic and unpredictable.

I see impacts in three areas, only one of which is related to El Vado’s initial purpose.

Ristras of varying pod types and ripeness. By Christopher Holden from Albuquerque, United States – Ristras, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=95944700

1: IRRIGATION

This is the obvious one. Until El Vado is repaired or some sort of replacement schemed out, irrigators should expect a high risk of low or no supply in late summer and fall. Alfalfa will remain a reliable if modest crop (it can hunker down and wait out the dry), but the few commercial operators who need a more reliable supply for their crops – think pecans and chile – will have to depend on groundwater, with all the problems that entails.

The Albuquerque, New Mexico International Balloon fiesta. (October 2007). By Danae Hurst from Albuquerque, United States – Ballooning Over Albuquerque, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=6791765

2: MUNICIPAL SUPPLIES

Albuquerque’s use of its imported San Juan-Chama water in summer indirectly depends on El Vado. Without MRGCD water, released from El Vado, as “carriage water”, the Albuquerque Bernalillo County Water Utility has to leave its imported San Juan-Chama water parked in Abiquiu Reservoir, switching to groundwater. This is what we have done over the last few years, and our much-vaunted aquifer recovery has, as a result, stalled.

This poses a huge challenge for the Albuquerque Bernalillo County Water Utility Authority.

Rio Grande Silvery Minnow via Wikipedia

3: ENVIRONMENTAL FLOWS

The idea of an agricultural irrigation dam providing the water for environmental flows seems super weird. But that’s basically the way it’s worked for years here in the Middle Valley. Releases from El Vado, sent downstream to irrigators, provide environmental benefits along the way. For the last couple of years, without El Vado water to supplement flows in late summer, the Rio Grande has operated on a knife’s edge between flowing and dry through Albuquerque.

This poses a huge challenge for efforts to nurse the Rio Grande silvery minnow back from extinction.

Abiquiu Dam, impounding Abiquiu Lake on the Rio Chama in Rio Arriba County, New Mexico, USA. The U.S. Army Corps of Engineers constructed the dam in 1963 for flood control, water storage, and recreation. By U.S. Army Corps of Engineers, photographer not specified or unknown – U.S. Army Corps of Engineers Digital Visual LibraryImage pageImage description pageDigital Visual Library home page, Public Domain, https://commons.wikimedia.org/w/index.php?curid=2044112

STORAGE ALTERNATIVES

First and foremost, there is a fast-moving and scrambling discussion about storage alternatives.

Abiquiu Reservoir, a flood control facility on the Rio Chama built, owned, and managed by the U.S. Army Corp of Engineers, is an obvious replacement. The part in italics yields knowing nods, or perhaps grimaces, from folks who work in Middle Valley water management, because the Corps is well known for an exceedingly cautious interpretation of its statutory mandates. “Filling in as a water storage facility to replace El Vado” is only sorta barely at the edge of that mandate. Getting the Corps on board to help with this fix will be key.

Heron Lake, part of the San Juan-Chama Project, in northern New Mexico, looking east from the Rio Chama. In the far distance is Brazos Peak (left) and the Brazos Cliffs (right), while at the bottom is the north wall of the Rio Chama Gorge. By G. Thomas at English Wikipedia – Transferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=1598784

Heron Reservoir, on a Rio Chama tributary, stores San Juan-Chama water imported through tunnels beneath the continental divide. It physically can’t replace El Vado because it’s in the wrong place. But discussions have already touched on the idea of doing it on paper via accounting swaps – hold back San Juan-Chama water, let SJC customers use native Rio Grande water via an accounting swap, then deliver Heron water as if it had been El Vado water.

Downstream of Elephant Butte Dam (back in the day), water issues get even trickier. By Unknown author – http://www.usbr.gov/power/data/sites/elephant/elephant.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1267389

Elephant Butte? Again, it’s in the wrong place, but accounting swaps here are also on the table.

INSTITUTIONAL FRAMEWORK

The most important subtext is the institutional framework behind all of this. The loss of El Vado is not solely an MRGCD/Bureau of Reclamation problem. It implicates all the Middle Valley’s water stakeholders – especially Albuquerque’s Water Utility Authority, but also the Corps of Engineers, the Fish and Wildlife Service (because of ESA issues), the state water agencies, the communities on the valley floor that have avoided responsibility for any of this by depending on the state’s obscenely permissive domestic well statute.

New Mexico Lakes, Rivers and Water Resources via Geology.com.

Aspinall Unit Coordination Meeting April 18, 2024 #GunnisonRiver #ColoradoRiver #COriver #aridification

Aspinall Unit dams

From email from Reclamation (Erik Knight):

The next coordination meeting for the operation of the Aspinall Unit is scheduled for Thursday, April 18th 2024, at 1:00 pm. 

This meeting will be held at the Western Colorado Area Office in Grand Junction, CO. There will also be an option for virtual attendance via Microsoft Teams. A link to the Teams meeting is below.

The meeting agenda will include a review of operations and hydrology since January, current soil and snowpack conditions, a discussion of hydrologic runoff forecasts, the weather outlook, and planned operations for this water year. 

Handouts of the presentations will be emailed prior to the meeting.

Five Major Proposals for Post-2026 management of the #ColoradoRiver — John Fleck (Inkstain.net) #COriver #aridification

AI image. Credit: Sibley’s Rivers

Click the link to read the article on the Inkstain website (John Fleck):

April 3, 2024

With the submission of two additional proposals last week, we now have five major proposals for post-2026 Colorado River management.

The folks at the Water and Tribes Intitiative have helpfully organized them in a single place. (Click on the
“Proposed Alternatives for Post-2026 Operating Guidelines” bubble.)

TRIBAL PRINCIPLES

A set of guiding principles proposed by 17 of the basin’s sovereign indigenous communities. (click here)

UPPER BASIN PROPOSAL

What the label says, you already know about this one. (click here)

LOWER BASIN PROPOSAL

What the label says, you already know about this one. (press releasealternativepresentation)

ENVIRONMENTAL NGOS

The “Big Seven” Colorado River Basin environmental groups (click here)

LAKE POWELL/GRAND CANYON/LAKE MEAD ECOSYSTEM PROPOSAL

A proposal from Jack Schmidt, Eric Kuhn, and John Fleck suggesting ways to manage the storage and distribution of water to provide more flexibility for environmental and other non-water supply benefits. (click here)

A plumbing issue at this #LakePowell dam could cause big trouble for Western water — KUNC #ColoradoRiver #COriver #aridification

Bob Martin, who manages hydropower at Glen Canyon Dam, shows the effects of cavitation on a decommissioned turbine on Nov. 2, 2022. When air pockets enter the dam’s pipes, they cause structural damage. Water managers recently discovered similar damage in a little-used set of tubes that carry water to the Colorado River. Photo credit: Alex Hager/KUNC

Click the link to read the article on the KUNC website (Alex Hager):

April 12, 2024

This story is part of ongoing coverage of water in the West, produced by KUNC in Colorado and supported by the Walton Family Foundation. KUNC is solely responsible for its editorial coverage.

Conservation groups are calling for changes to the management of Lake Powell, the nation’s second largest reservoir, after the discovery of damaged plumbing within the dam that holds it back.

The damage is to Glen Canyon Dam’s “river outlet works,” a critical set of small tubes near the bottom of the dam that were originally intended to release excess water when the reservoir is nearing full capacity. 

The reservoir is currently only 32% full, beleaguered by climate change and steady demand. Water experts think the river outlet works may soon become the only way to pass water from Lake Powell, situated in far northern Arizona, to the Colorado River on the other side. Experts worry that damage to those tubes could impede the ability to use them regularly.

It’s the latest twist in the saga of Glen Canyon Dam, which has been at the center of recent concern about the shrinking Colorado River, even before news of the damaged pipes came to light. Water experts fear Lake Powell could drop so low that water would be unable to pass through hydropower turbines that generate electricity for about 5 million people across seven states. If it falls even lower, water would be unable to pass through the dam at all, keeping it out of the Grand Canyon just downstream of Lake Powell.

A high desert thunderstorm lights up the sky behind Glen Canyon Dam. Glen Canyon Dam holds back Lake Powell on Nov. 2, 2022. As water levels drop to historic lows, conservation groups are highlighting infrastructure issues inside the dam and calling for new water management policies that bypass the dam entirely. — Photo USBR

The threat of that reality has led nonprofit advocacy groups to sound the alarm.

“I think it’s really important for people to recognize how much of a threat this is to our water delivery system,” said Eric Balken, executive director of the Glen Canyon Institute. “This is a really big infrastructure problem, and it has a big impact on how water is managed throughout this whole basin.”

The implosion of a cavitation bubble causes a high-speed jet of fluid to impact a fixed surface. By User; lidingo – My own drawing, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2913721

The recent damage to the outlet works is the product of a process called “cavitation.” It happens when small air bubbles in the water pop while passing through the dam’s plumbing. That implosion is strong enough to create shock waves that tear away small chunks of protective coating on the insides of pipes.

In recent years, the outlet works has been used to release temporary bursts of water designed to boost ecosystems in the Grand Canyon. The cavitation damage was discovered during inspections of the pipes after a series of those planned water bursts in April 2023.

In an informational webinar on Monday, Reclamation officials explained the damage and said it was not the result of one specific event, but has occurred over time. 

Nick Williams, Upper Colorado River power manager for the Bureau of Reclamation said cavitation damage is more likely when reservoir levels are low. 

The river outlet works can still carry water, but will require repairs – such as a fresh coating of epoxy that is scheduled for either later this year or early 2025. 

Legal risk and harm to fish

Even with a fully functioning river outlet works system, those pipes are only capable of carrying a relatively small amount of water. If the outlet works become the only means of passing water through the dam, the Colorado River’s Upper Basin states – Colorado, Wyoming, New Mexico, and Utah – could fail to meet a longstanding legal obligation to pass a certain amount of water to their downstream neighbors each year.

The Colorado River Compact, a 1922 legal agreement that forms the foundation of modern water management in the arid West, requires the Upper Basin to pass 7.5 million acre-feet of water to the Lower Basin states of California, Arizona and Nevada each year.

An acre-foot is the amount of water needed to fill one acre of land to a height of one foot. One acre-foot generally provides enough water for one to two households for a year.

Lake Powell is often described as the Colorado River’s “savings account,” where the Upper Basin states stash water to make sure there’s always enough to meet their legal requirement to send some downstream. Then, the Lower Basin stores those water deliveries in Lake Mead, its “checking account.” Mead, he nation’s largest reservoir, holds water that will eventually flow to cities such as Las Vegas, Phoenix and Los Angeles, as well as sprawling farm fields in California and Arizona.

The back of Glen Canyon Dam circa 1964, not long after the reservoir had begun filling up. Here the water level is above dead pool, meaning water can be released via the river outlets, but it is below minimum power pool, so water cannot yet enter the penstocks to generate electricity. Bureau of Reclamation photo. Annotations: Jonathan P. Thompson

Conservation groups have cited the limited capacity of the outlet works in previous calls to change the way Lake Powell is managed. The recent damage, they said, could make the outlet works unusable, only worsening the challenge of keeping water flowing downstream from Lake Powell.

“If you lose your job, you don’t go out and buy yourself an elaborate dinner, justifying it by saying, ‘I still have money in my checking account,’” said Zach Frankel, executive director of the Utah Rivers Council. “You go, ‘Wow, I lost my income. I better look at my expense budget and see if it’s time to tighten my belt.’ The Colorado River Basin has not yet learned to do that.”

In recent years, Lake Powell has barely stayed high enough for water to pass through hydropower turbines. That’s the result of a shell game by water managers, who have shuffled water into Lake Powell from upstream reservoirs on an emergency basis.

Damage to the outlet works also raises concern about invasive fish entering a section of the Colorado River that flows through the Grand Canyon. Dropping water levels have allowed invasive smallmouth bass to swim through to the other side, where they can eat native humpback chub, a species protected by the Endangered Species Act.

Recently, federal water managers released plans to help protect those at-risk chubs. Those plans partially hinge on the ability to release cold water through the river outlet works and into the Grand Canyon. Wildlife advocates criticized those plans even before the news of damage to the river outlet works, which could further jeopardize native fish conservation efforts.

Fixes for the future

The seven states which use the Colorado River are currently caught in a standoff about how to cut back on water demand. They are currently negotiating a new set of rules for sharing the river, designed to replace the current guidelines that expire in 2026—but are stuck at an ideological impasse.

That new set of rules could theoretically introduce a long-term plan for managing the West’s major reservoirs sustainably, allowing water managers to move on from a patchwork of emergency measures that have only temporarily staved off problems at Glen Canyon Dam.

Glen Canyon Dam has four bypass tubes, also referred to as river outlet works (ROWs) that can draw water from Lake Powell around elevation 3,370 feet, bypassing the powerplant and sending the water downstream. To send water from the new intake to the city of Page, the bypass tube’s valve is closed, allowing the pipe to fill with water, creating enough head pressure to send the water through the connected piping leading to Page’s water treatment facility. could soon be the only way for water to make it through Glen Canyon Dam. Recently-discovered damage to those tubes has raised questions about their role going forward.

Balken, with the nonprofit Glen Canyon Institute, said policymakers should consider major changes to how the dam is operated.

“If we’re going to update this river system to be climate resilient, and if we’re going to upgrade our infrastructure to deal with what climate change is handing us, we really have to take a hard look at bypassing Glen Canyon Dam,” Balken said.

In March, Upper Basin and Lower Basin states each released competing plans for post-2026 river management. Later a coalition of environmental nonprofits released their own. A group of tribes that use the Colorado River has issued a set of principles it hopes will be incorporated into future water management.

The Biden administration is urging states to find compromise before the end of 2024, in hopes of averting any complication that could be brought on by a change in presidential administration following the November election.

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Memo reveals damage to pipes inside #GlenCanyon Dam, a threat to #ColoradoRiver water supply — 8NewsNow.com #COriver #aridification

The back of Glen Canyon Dam circa 1964, not long after the reservoir had begun filling up. Here the water level is above dead pool, meaning water can be released via the river outlets, but it is below minimum power pool, so water cannot yet enter the penstocks to generate electricity. Bureau of Reclamation photo. Annotation credit: Jonathan P. Thompson

Click the link to read the article on the 8NewsNow.com website (Greg Haas). Here’s an excerpt:

 April 12, 2024

Nearly a year ago, the Colorado River was raging through the Grand Canyon, carrying enough water to raise Lake Mead by an astonishing 2½ feet in just five days. The surge that began on April 25, 2023, was part of a “High Flow Experiment” release from Glen Canyon Dam, churning up sediment to rebuild beaches and sandbars through the canyon. But the pipes used to send that gush of water from Lake Powell through Glen Canyon Dam are in trouble, a memo produced by the U.S. Bureau of Reclamation reveals.

“In summary, at reservoir levels below the minimum power pool (elevation 3,490 ft), there are concerns with relying on the river outlet works as the sole means of sustained water releases from Glen Canyon Dam,” the memo said.

The “river outlet works” is a backup system at Glen Canyon, used infrequently because Reclamation needs to generate as much electricity as possible by sending water through the hydropower penstocks, a much larger set of tubes higher up…A special inspection that happened around last year’s High Flow Experiment found erosion within the four 8-foot pipes of the river outlet works. The evidence of “cavitation” is being described by conservation groups as a new part of the “spectacular water crisis” that demonstrates the magnitude of problems with the dam. Cavitation produces shock waves that are powerful enough to damage steel, according to David Wegner, who worked 20 years as an engineer for Reclamation. He was lead scientist for environmental impact studies of Glen Canyon Dam, and a founding member of the Glen Canyon Institute. Wegner is now a senior staff member for the U.S. House of Representatives Water Resources and Environment Subcommittee. He is also a member of the National Academy of Sciences Water Science and Technology Board.

Glen Canyon Dam high flow release photo 2018.

This new proposal for #ColoradoRiver sharing prioritizes the environment — KUNC

A bird perches upon towering mud banks left behind by a shrinking Lake Powell on July 5, 2022. A new proposal for managing the Colorado River and its reservoirs encourages states to include environmental protections as they draw up water sharing plans. Photo credit: Alex Hager/KUNC

Click the link to read the article on the KUNC website (Alex Hager):

This story is part of ongoing coverage of the Colorado River, produced by KUNC and supported by the Walton Family Foundation. It was produced in partnership with The Water Desk, an independent initiative of the University of Colorado Boulder’s Center for Environmental Journalism.

April 1, 2024

A coalition of environmental groups is proposing a new set of rules for managing the Colorado River after 2026, when the current guidelines expire. Their proposal, which aims to weave environmental protections into river management policy, comes amid heated negotiations about how the shrinking river should be shared in the future.

In March, the seven states which use the river found themselves divided into two camps, each faction publishing its own proposal for managing water. The two groups have promised to work towards consensus and are aiming to agree on a singular plan before 2026. The authors of the new environmentally-focused proposal — a group of seven conservation nonprofits — say they don’t expect their own plan will be adopted in full, but hope to encourage state and federal water managers to consider plants, animals and ecosystems while drawing up their own Colorado River policies.

“If you integrate these ideas into those annual operations, you can have your water security — which the states want — but then you also get these environmental benefits that make sure that you do have a healthy flowing river that is the foundation for the entire system,” said John Berggren, a water policy expert at Western Resource Advocates, one of the conservation groups that co-signed the proposal.

All seven of the organizations that crafted the river management proposal receive funding from the Walton Family Foundation, which also supports KUNC’s Colorado River coverage.

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Current negotiations about how to share the Colorado River are driven by one defining fact: The water supply for 40 million people across the Southwest is shrinking due to climate change. Talks about how to rein in demand accordingly have been contentious since states are reluctant to cut into water supply for the cities, farms and ranches within their borders.

Fish biologist Dale Ryden holds a razorback sucker on Jan. 26, 2024. The native fish species is one of many in the Colorado River protected by the Endangered Species Act. Photo credit: Alex Hager/KUNC

The “Cooperative Conservation Alternative,” as dubbed by the environmental proposal’s authors, offers a series of ideas on how to make sure decisions about the water supply for people and businesses don’t leave the environment behind.

The first idea outlined in the proposal is the implementation of a new way of measuring how much water is stored in reservoirs along the Colorado River, with water releases adjusted accordingly. Among other tweaks to measuring reservoir storage, the proposal suggests adjusting reservoir releases according to recent trends in climate conditions. For example, the new method would take into account snowmelt lost to dry, thirsty soilswhen determining release levels following particularly dry years.

The environmental groups also want to see fish habitats considered as a factor when determining how much water is released from major reservoirs. The proposal cites the health of aquatic ecosystems in the Grand Canyon, where native fish are threatened by predatory invasive species that have been able to travel downstream due to dropping water levels in Lake Powell – the nation’s second largest reservoir.

The proposal also suggests the creation of a “Conservation Reserve,” a program that would allow water users to store some of their supply in major reservoirs. That stored water would be used to help avoid low reservoir levels that could damage infrastructure– including hydropower generators – but would not be counted when determining how much water is released from major reservoirs in a given year. The “Conservation Reserve” would replace the existing “Intentionally Created Surplus” program.

The conservation groups say the ideas in their proposal are designed to benefit the environment, but shouldn’t be seen as objectionable by the water users along the Colorado River or the states which ultimately have the most say in the river’s fate.

“That water supply is available to all of us because of the function of the river as an ecosystem itself,” said Jennifer Pitt, Colorado River program director at the National Audubon Society. “If we ignore that entirely, and the system that sustains that functioning waterway erodes and breaks down, we may lose some of its ability to deliver us water in the first place.”

Pitt also said more robust ecosystem protections can occasionally help water users stay in legal compliance with environmental rules. There are 27 species covered by the Endangered Species Act in the lower Colorado River basin, and water users can face penalties if they’re unable to leave enough water in the river to maintain healthy habitatsfor those protected species.

A toad climbs a rock in a canyon near Lake Powell on July 6, 2022. The authors of a new proposal to protect ecosystems along the Colorado River said a healthy flowing river would benefit human water users as well as plants and animals. Photo credit: Alex Hager/KUNC

The environmental proposal joins prior suggestions from the Colorado River’s upper basin states of Colorado, Utah, Wyoming and New Mexico, and a competing proposal from the lower basin states of California, Arizona and Nevada.

Native America in the Colorado River Basin. Credit: USBR

A number of the 30 federally-recognized Native American tribes that use the Colorado River may also be working on water management proposals. The Gila River Indian Community in Arizona, which has positioned itself as a major tribal player in water management talks, said it did not support the lower basin states’ plan released in March and will soon release its own suggestions for managing the river.

A separate group of 16 tribes sent a letter to the Bureau of Reclamation – the federal agency that manages Western dams and reservoirs – outlining a series of “principles” the tribes want to see reflected in final Colorado River management plans.

While the current rules for sharing the river are set to expire in 2026, the Biden administration’s water officials want to arrive at a final set of replacement rules by the end of 2024 to avoid any complication that could come from a change in presidential administration after the November election.

Map credit: AGU

Gila River Indian Community says it doesn’t support latest #ColoradoRiver sharing proposals — KUNC #COriver #aridification

Stephen Roe Lewis, Governor of the Gila River Indian Community, speaks in Tucson, Ariz. on Mar. 13, 2024. The tribe has been a high-profile partner to federal and state water managers in recent years, but Lewis said it does not support the latest Lower Basin proposal for post-2026 Colorado River management. Credit: Alex Hager/KUNC

Click the link to read the article on the KUNC website (Alex Hager):

March 13, 2024

This story is part of ongoing coverage of the Colorado River, produced by KUNC in northern
Colorado, and supported by the Walton Family Foundation.

The Gila River Indian Community says it does not support a three-state proposal for managing the Colorado River’s shrinking supply in the future. The community, which is located in Arizona, is instead working with the federal government to develop its own proposal for water sharing.

The tribe is among the most prominent of the 30 federally-recognized tribes that use the Colorado River. In recent years, it has signed high-profile deals with the federal government to receive big payments in exchange for water conservation. Those deals were celebrated by Arizona’s top water officials. But now, it is diverging from states in the river’s Lower Basin — Arizona, California and Nevada.

Stephen Roe Lewis, The Gila River Indian Community’s Governor, announced his tribe’s disapproval of the Lower Basin proposal at a water conference in Tucson, Ariz., while speaking to a room of policy experts and water scientists.

“This is not the time to be standing on the sidelines,” Lewis said. “We all have a responsibility to do what we can. And that’s why The Community can’t support the current Lower Colorado River approach as it stands now.”

The announcement adds a new wrinkle to an already-complicated process. Last week, the seven states that use the Colorado River unveiled competing plans for managing its water. The Lower Basin states revealed one, and the Upper Basin states – Colorado, Utah, Wyoming and New Mexico – revealed another. The opposing plans represent stark ideological differences between the two groups of states, marking the latest disagreement between rival camps that have argued over water management for decades.

Lewis, who has positioned his tribe as an ally to the federal government in helping save water, outlined a few major sticking points that led Gila River to work on its own proposal.

Water enters an irrigation canal on the Gila River Indian Reservation on May 7, 2021. The Gila River Indian Community is among the most important tribal players in ongoing negotiations about using water from the Colorado River. Photo by Ted Wood/Water Desk

One issue, Lewis said, is that the Lower Basin’s proposal creates an “unfair burden” on the state of Arizona. Under the proposed plan, all seven states would have to cut back on demand for water if levels in the nation’s largest reservoirs — Lake Mead and Lake Powell — drop below a predetermined trigger in the future. Arizona would take the largest of those cutbacks.

Another, he said, is that the Lower Basin’s plan does not explain how it would mitigate the impact of those potential new water cutbacks. Lewis said he would like to see plans to identify new sources of water away from the Colorado River that could replace water lost to cutbacks, or financial compensation.

States are under pressure to agree on plans to manage the river before 2026, when the current guidelines for sharing its water expire. Both of last week’s plans came just ahead of a deadline from the Bureau of Reclamation, the federal agency which manages the West’s dams and reservoirs. The deadline was an effort to get the ball rolling on new river rules with enough time to implement them before a potential change in administration after the upcoming November election.

Reclamation officials said they expect to work with states over the spring and summer and reach a draft for post-2026 river management rules by the end of 2024.

Now, Lewis and his staff are working with Reclamation on what could potentially be a third competing proposal. He said he hopes a proposal will be released in “weeks,” rather than months.

“It’s potentially not just the Gila River, because this will affect other tribes as well,” Lewis said. “I wouldn’t be surprised if other tribes started to register their concerns as well.”

As states and the federal government draw closer to a new set of river management rules, some tribes have repeatedly expressed frustration about being excluded from negotiations. Tribal communities often lack reliable access to clean water due to aging infrastructure and a history of underinvestment, and many are calling for greater inclusion going forward.

Lewis said that was not the issue in this case, and that the Gila River Indian Community was included in talks.

“We were at the table,” Lewis said. “It’s just the proposal, the finished product as it is right now, doesn’t reflect our concerns.” [ed. emphasis mine]

North American Indian regional losses 1850 thru 1890.

Cooperative Conservation NEPA Alternative: Post-2026 #ColoradoRiver Operations and Strategies — via WaterForColorado.org #COriver #aridification

Click the link to read the proposed guidelines on the Water for Colorado website. Here’s the introduction:

On behalf of our respective organizations, the undersigned conservation groups (Conservation Groups or Groups) submit the Cooperative Conservation Alternative (Cooperative Conservation) to contribute to the ongoing dialogue shaping the future of the Colorado River through the post-2026 NEPA process for developing Colorado River Guidelines and Strategies.

The Groups request the Bureau of Reclamation include Cooperative Conservation in its analysis of post-2026 Colorado River Guideline Operations and Strategies as a forward-looking, comprehensive approach for addressing the pressing and evolving challenges facing the Colorado River Basin, its ecosystems, and the diverse community of sovereigns and stakeholders who rely upon its resources.

Cooperative Conservation is designed to inform and enhance one or more alternatives for consideration in developing the post-2026 Colorado River Operations and Strategies Environmental Impact Statement (EIS). It emerges from a synthesis of lessons learned, a deep understanding of the Basin’s environmental dynamics, and a commitment to collaborative, equitable water management, and endeavors to introduce innovative strategies that balance the needs of human and natural systems under the shadow of climate change and increasing water scarcity. [ed. emphasis mine]

The urgency to redefine the framework for Colorado River operations cannot be overstated. The Bureau of Reclamation’s (Reclamation) notice of intent to prepare an EIS for the post-2026 Colorado River marks a critical step toward addressing the Basin’s future needs (“Notice of Intent To Prepare an Environmental Impact Statement for Post-2026 Colorado River Operational Guidelines and Strategies for Lake Powell and Lake Mead,” 88 Fed. Reg. 12345 (June 16, 2023)). The existing guidelines, while pioneering at the time of their inception, are now recognized as insufficient to navigate the complexities of prolonged drought, escalating impacts of climate change, and pressing needs of a diverse array of sovereigns and stakeholders. Cooperative Conservation is rooted in the recognition that the Colorado River Basin has entered an era of uncertainty, where traditional management approaches must be reevaluated in light of scientific advancements, changing hydrological patterns, and the imperative of sustainability.

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

The significance of this Alternative lies not only in its aim to expand consideration of ways to address the immediate challenges, but also in its vision for a resilient and adaptive future that honors the interdependence of all who share this vital river. By embracing a holistic perspective that integrates scientific insight, stakeholder inclusivity, and environmental stewardship, our alternative is a framework for optimizing every drop of the Colorado River to better ensure it can remain a life-sustaining resource for future generations.

As the Conservation Groups submit this Alternative, we are mindful of the collective effort required to steward the Colorado River through the challenges ahead. We look forward to engaging in a constructive dialogue with Reclamation, the Basin States and Tribes, and all interested stakeholders involved in this essential process, united by our shared commitment to the River that sustains us all.

Map credit: AGU
Native America in the Colorado River Basin. Credit: USBR

Navajo Dam operations update April 5, 2024: Bumping up releases to 500 CFS in the #SanJuanRiver #ColoradoRiver #COriver #aridification

San Juan River Basin. Graphic credit Wikipedia.

From email from Reclamation (Susan Novak Behery):

In response to falling flows in the critical habitat reach, the Bureau of Reclamation has scheduled an increase in the release from Navajo Dam from 400 cubic feet per second (cfs) to 500 cfs for tomorrow, April 5th, at 4:00 AM.

Releases are made for the authorized purposes of the Navajo Unit, and to attempt to maintain a target base flow through the endangered fish critical habitat reach of the San Juan River (Farmington to Lake Powell).  The San Juan River Basin Recovery Implementation Program recommends a target base flow of between 500 cfs and 1,000 cfs through the critical habitat area.  The target base flow is calculated as the weekly average of gaged flows throughout the critical habitat area from Farmington to Lake Powell.  

Romancing the River: To Halve and Have Not — George Sibley (Sibley’s Rivers) #ColoradoRiver #COriver #aridification

AI image. Credit: Sibley’s Rivers

Click the link to read the article on the Sibley’s Rivers website (George Sibley):

In my last post, I reported that the water mavens of both the Upper and Lower Colorado River Basins had each presented the Bureau of Reclamation with plans for managing the river after 2026, when the current, amended ‘Interim Guidelines’ expire.

The Interim Guidelines had been implemented in 2007, remember, when it was obvious that the patchwork of existing ‘Law of the River’ (LOTR) guidelines, laws, treaties, compacts and other measures propping up the Colorado River Compact were failing to constructively guide the extensive storage and distribution systems imposed on the river through the turn-of-the-century drought that had begun six years earlier.

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

The Bureau and the seven states have since cobbled together – with help from a big snowpack in the 2023 water year and a rain of cash from the Biden administration’s infrastructure acts – a set of added interim actions to stagger through the remainder of the interim to 2026. The immediate emergency out of the way, the Bureau asked the water leaders of the seven states, and of the 30 First People nations in the river basin that will no longer allow the states to ignore them, to come up with a plan for managing the river works from 2027 through – well, another interim, maybe another 20 years. In a time of climate change and political chaos, we no longer think ‘in perpetuity’ (which never worked out anyway).

So the water leaders gathered for several meetings, to try to come up with a plan for managing the river after 2027. But they were not succeeding, so the predictable happened: they went home to the two Basins established by the 1922 River Compact, and each group prepared an ‘alternative plan’ for the management of the river.

I’ve created a fairly detailed side-by-side comparison of the actions each alternative proposes when triggered by diminishing levels of storage in the reservoirs; it would not, however, be readable in the format of these posts, so you can click here to bring up a readable copy. Meanwhile, here is a summary of some of the main points, similarities and differences between the two alternatives.

Both alternatives are similar conceptually: they operate on a measure of storage in some of the reservoirs on the river, with changes in the total content of the selected reservoirs triggering reductions in consumptive use by one or both Basins. Each alternative, however, uses a different set of reservoirs as the base – and a different date for measuring the content of the reservoirs.

The Lower Basin alternative wants the measuring standard to be the live storage of the major reservoirs in the river’s storage system: the four large Colorado River Storage Project reservoirs in the Upper Basin (Powell, Flaming Gorge, Blue Mesa and Navajo), and the three mainstem Lower Basin reservoirs (Mead, Mojave behind Davis Dam and Havasu behind Parker Dam) – a total of ~58 million acre-feet (maf) when they are full, which they currently are not. And they want the total system content to be measured on August 1 every year, a time when the reservoirs are still relatively full after runoff. (‘Live storage’ is the volume minus the ‘dead pools’ that cannot be delivered past the dams.)

Lake Mead key elevations. Credit: USBR

The Upper Basin alternative wants to measure only the live storage of Mead and Powell Reservoirs, minus an undefined ‘threshold volume’ for each of them – 4.2 and 4.7 maf respectively (probably the quantity required to keep the reservoir levels up to power-generating capacity?). This would probably be in the neighborhood of 40 maf when both reservoirs are full, which they are not. And they want the annual measure to be on October 1, the beginning of the new water year, a time when storage has been somewhat depleted by agricultural use.

The structural deficit refers to the consumption by Lower Basin states of more water than enters Lake Mead each year. The deficit, which includes losses from evaporation, is estimated at 1.2 million acre-feet a year. (Image: Central Arizona Project circa 2019)

Both alternatives are in agreement that reductions in use have to start with the Lower Basin cutting its use by the amount of the ‘structural deficit’ – the system losses through evaporation, riparian transpiration, et cetera, a total of ~1.5 maf. This decrease starts linearly when total storage as measured by the Lower Basin drops to 70 percent of full and ramps up to 1.5 maf when/if storage drops to 58 percent. The Upper Basin alternative has the Lower Basin starting its 1.5 maf reduction when its measure of storage is at 90 percent of full, and ramps up to 1.5 maf at 70 percent. With storage, however it is measured, chronically well down in the 30 percents these days, the Lower Basin could count on leaving 1.5 maf in Mead for the foreseeable future under either alternative.

The big difference between the two alternatives comes when or if storage drops to 38 percent by the Lower Basin’s measure of total system storage, and 20 percent of Powell-Mead storage by the Upper Basin measure. At that point – basically panic time – the Lower Basin wants both Basins to begin to ramp up to an additional 2.7 maf feet of reductions, to a total of 3.9 maf – basically the 4 maf in reductions the Bureau asked for in the panicky days of 2022.

The Upper Basin, however, wants the Lower Basin to do all of the 2.7 maf in reductions, on top of the 1.5 the Lower Basin will still be doing. Their justification: if river storage drops to those levels, then the Upper Basin, much of which has no storage to rely on, will already have had reductions at least that bad imposed by nature’s ‘hydrologic shortages.’ To make them do additional reductions to send more to the reservoirs would be the equivalent of double taxation.

The Upper Basin Alternative also throws a wild card into the game; it unilaterally grants itself the prerogative to ‘undertake parallel but separate activities that are not a part of this federal action or part of the [UB] Alternative. Parallel activities refer to actions in the Upper Basin that are beyond the scope of the Post-2026 Operations, but may complement those operations.’

The ‘parallel activities’ are briefly described as (but not limited to) activities like retaining the right move waters among the big Colorado River Storage Project reservoirs under pre-existing Records of Decision, and carrying out conservation programs like the Upper Basin’s Pilot System Conservation Program that pioneered the ‘paid reductions’ that are the core of the program to get the river system through 2026 (a pilot program partly paid for by large Lower Basin organizations). It may be too much read into this a kind of ‘declaration of independence’ for the Upper Basin, but it is an independent step toward adaptive management that might make the Lower Basin, accustomed to dependable deliveries from the Upper Basin a little nervous….

September 21, 1923, 9:00 a.m. — Colorado River at Lees Ferry. From right bank on line with Klohr’s house and gage house. Old “Dugway” or inclined gage shows to left of gage house. Gage height 11.05′, discharge 27,000 cfs. Lens 16, time =1/25, camera supported. Photo by G.C. Stevens of the USGS. Source: 1921-1937 Surface Water Records File, Colorado R. @ Lees Ferry, Laguna Niguel Federal Records Center, Accession No. 57-78-0006, Box 2 of 2 , Location No. MB053635.

And there’s one nice thing to see: both alternatives seem to bypass the Colorado River Compact mandate that the Upper Basin ‘will not cause the flow of the river at Lee Ferry to be depleted below’ an annual average of 7.5 maf, come hell or low water, or the big bad Lower Basin will come after your water to make it up. When the live storage drops to the low 20 percents in both alternatives, the releases from Powell drop to 6.0 maf – with no language implying a ‘call’ on the Upper Basin if that amount is unavailable. (Not that any such language ever existed in the Compact.)

Speaking of the Colorado River Compact. Yes, we cannot escape it. It is difficult to look at this situation and not see the Compact at work, and as usual, not in a constructive way.

Forty-seven years ago, in 1977, one of the Colorado River’s droughtier years – an estimated natural flow of 5.8 maf, third lowest since measuring began – I wrote an article about the Colorado River for a magazine that wanted ‘something about the drought.’ Figuring correctly that the drought emergency would be over by the time an article would be published, I wrote a long essay about how the drought was not a problem that year for the Lower Colorado River because of the huge storage it had – but how it could be facing problems in the future if it continued uncontrolled growth. (That article, ‘The Desert Empire,’ is archived on this site.)

The back of Glen Canyon Dam circa 1964, not long after the reservoir had begun filling up. Here the water level is above dead pool, meaning water can be released via the river outlets, but it is below minimum power pool, so water cannot yet enter the penstocks to generate electricity. Bureau of Reclamation photo.

But one thing I observed then as a possible source of future difficulty was the political division of the river into two basins. It was only a ‘paper division’ in the Compact, but it became concrete, as it were, when Glen Canyon Dam began to fill in 1963, finally finishing filling three years after this observation about its impact in that 1977 essay:

Glen Canyon Dam backs up a body of water … which amounts to nearly the equivalent of what flows down the Colorado River in two years. The amount of water that flows out of the lake reflects not the influx from upriver but demands from downriver.

This being the case, it seems just sentimental to continue to think of the Colorado River as a single entity. For all practical purposes there are now two rivers – interdependent, to be sure, but separate, and under separate management…. To describe the two rivers in the simplest possible manner: the Upper Colorado River is generally patterned after a ‘natural’ river, with many sources and a single destination. The Lower Colorado River, on the other hand, is patterned more after, say, a municipal waterworks, with a single primary source and many destinations. [ed. emphasis mine]

Now, a century after the Compact divided the river into two basins, and almost half a century after that observation about the post-dam river(s) – how can we look at this situation in which the water mavens from the (once) whole river sat down together to try to come up with a plan for managing the system imposed on the river(s), but after only a few days’ effort, withdrew to their ‘Upper and Lower Colorado Rivers’ to work out their River’s separate perspective on the problem? This may be the apotheosis of the Colorado River Compact, the completion of the division into two river basins whose users don’t always seem to remember they are all on the same river. Both alternatives express a willingness by their makers to reassemble as one group, but….

Map of the greater Colorado River Basin which encompasses the Colorado Plateau. Credit: GotBooks.MiraCosta.edu

The natural river itself encourages this kind of separation, with a region of mostly uninhabited (if often visited) canyons constituting close to a fourth of the length of the river, separating two regions of human activity. This kind of a ‘devoid’ in the middle part of a river basin is probably just nature in the middle of some of its endless work. The river probably began as two rivers, running off the Colorado Plateau in opposite directions, that eroded into each other and are still in the contentious process of becoming one river (as soon as they are able to completely eliminate the Colorado Plateau through all their magnificent work-in-progress erosions).

The two areas of human activity above and below the canyons have evolved over the past century and a half in ways consistent with the nature of the river that runs through them. Above the canyons, mountains dropping into piedmont plateaus, carved and deposited by many small streams flowing together into larger streams, all encouraging modest scales of cultural development, by individuals or small communities, a refuge for a time for Jefferson’s and Powell’s ‘agrarian counterrevolution.’

Back of Hoover Dam prior to first fill photo via Reclamation.

But the other river, below the canyons, flowed out of the canyons in a powerful seasonal flood or, later, a comparative trickle, a desert river, an anomaly doing nothing for the desert but moving its silt and sand farther toward the ocean. This was a river just waiting for the Industrial Revolution, the Anthropocene juggernaut of nature transformed to the service of humankind. And that revolution arrived, late in the 19th century, growing so fast in the desert that users in the agrarian states upstream feared the entire river might be appropriated out from under them. The Compact commission resulted, to try to quell those fears enough so the Bureau of Reclamation could build the big mainstem dam that would enable California to grow even faster….

The best the Compact commission could do was the division of the river into the two basins, linked only by the mandate for the Upper River water users to not dry up the Lower River users. This did nothing but formalize that ‘natural’  division created by the canyons – and also some of the problems innate to the cultural division between the industrial revolutionaries and the agrarian counterrevolutionaries (now enjoined with the environmental and recreational groups). The long descent toward breakdown, exacerbated by climate changes we never meant to cause, has culminated in the leaders of the two basins breaking off joint negotiations over the future, and going home to their own two rivers to draft up mandates for each other.

Yet they all appear to be committed to hanging onto the Compact, like a drowning man hangs onto a straw.

Meanwhile, however, the people who were here first in the two river basins, and the canyons too, have cleared their throats, and announced again that they will not be ignored in planning the future of the river. Sixteen of the First People nations have submitted their thoughts on the future of the river to the Commissioner of Reclamation, with a list of considerations they want answers for. We will look at that next post, and maybe muse a little further on how to make one river out of two, or thirty-two. Or should we just go with two or more? Suggested reading: Go to your Trump Bible and read First Kings 3:16-28.

Native America in the Colorado River Basin. Credit: USBR

Reclamation announces funding opportunity for Snow Water Supply Forecasting Program #snowpack

This map shows the snowpack depth of Castle and Maroon valleys in spring 2019. The map was created with information from NASA’s Airborne Snow Observatory, which will help water managers make more accurate streamflow predictions. Jeffrey Deems/ASO, National Snow and Ice Data Center

Click the link to read the release on the USBR website (Chelsea Lair):

March 28, 2024

The Bureau of Reclamation is making a minimum of $3 million available for emerging snow monitoring technologies. Each selected project is eligible to receive between $300,000 – $999,999 and must include the implementation of aerial LiDAR snow surveys. 

The funding opportunity is available at www.grants.gov by searching for funding opportunity number R24AS00206. Applications are due on May 6, 2024, at 4 p.m. MDT. 

The funding is through Reclamation’s Research and Development Office and funds will be provided by grant. 

Eligible applicants include water districts, irrigation districts, water associations, universities, state agencies, private sector entities, City/county or township governments, Tribal Government, nonprofit Organizations, non-governmental organizations, and any combination of the entities listed above. 

Applicants can submit projects that meet the following criteria: 

  • Emerging snow monitoring technologies – Demonstrating and/or deploying. 
  • Improvements to existing snow monitoring technologies – Demonstrating and/or deploying. 
  • Deploying snow monitoring technologies in poorly monitored areas. 
  • Improve the use of snow monitoring data to enhance water supply forecasts.  

The Bureau of Reclamation will host a webinar on April 5, 2024, from 11:30 a.m. to 12:30 p.m. MDT to discuss eligible applicants and project types, program requirements, and the evaluation criteria for the Snow Water Supply Forecasting funding opportunity. Please register to attend the webinar. If you are not able to make it, the webinar recording will be available at the challenge website. 

Reclamation’s Snow Water Supply Forecast Program aims to enhance snow monitoring and to advance emerging technologies in snow monitoring and subsequent water supply forecasts. The program activities are working to build climate change resilience by enabling improved water management. To learn more, please visit the program website. 

Upper #ColoradoRiver Basin States Approve the Implementation of the 2024 System Conservation Pilot Program — Upper Colorado River Commission #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Click the link to read the release on the Upper Colorado River Commission website:

On March 4, 2024, the Upper Division States of Colorado, New Mexico, Utah and Wyoming acting through the Upper Colorado River Commission (UCRC) directed implementation of the 2024 System Conservation Pilot Program (SCPP). The 2024 program focuses on projects that support: innovations in water conservation, local drought resiliency and better understanding related to a potential Demand Management program. The 2024 SCPP was developed based on input from water users, water management organizations, and previous SCPP participants. The Commission recommended 115 projects move forward for implementation. These projects will conserve approximately 70,000 acre-feet of Colorado River water across the four Upper Division States, and include participation from Tribal, agricultural, industrial and municipal water users. The SCPP program is funded by the Inflation Reduction Act and is a unique collaboration between the Bureau of Reclamation, the four Upper Division States acting through the UCRC, Upper Basin Tribes, water users, and other stakeholders. The conservation projects are expected to be implemented beginning in April 2024.

Anne Castle – “The SCPP is a tremendous example of federal – state – tribe – water user collaboration resulting in partnerships and water conservation that improve the Colorado River system. This program represents one of the tools in the Upper Basin toolbox that can be used to contribute to a more sustainable river system. Many thanks to the Reclamation, UCRC, Tribes, water users, and State staff for the ongoing efforts that allow us to take this important step together.”

Rebecca Mitchell – “System conservation is challenging, but we have learned a lot and have used our experiences to build a better program this year. Water users in Colorado are using the SCPP to explore and develop innovative ways to prepare for a drier future. I am hopeful that the lessons learned this year will provide new tools that will support Colorado water users in the future.”

Estevan Lopez – “The water conservation actions being implemented in the Upper Division States are significant, especially in light of the uncertainty our water users face every year due to hydrologic shortages. The partnerships and tools being developed through the SCPP will help us manage Colorado River operations as climate change impacts our future water supplies. Some SCPP projects will provide a unique opportunity to explore the feasibility of a potential Demand Manage program. ”

Gene Shawcroft – “Utah water users have stepped up once again in 2024 to support the Colorado River system through robust participation in the System Conservation Pilot Program (SCPP). Through this year’s SCPP projects, the Colorado River Authority of Utah looks forward to learning more about demand management feasibility and innovative water conservation strategies in our state. I am grateful to the UCRC staff and consultants, Authority staff and the Utah Division of Water Rights staff for standing-up this important effort.”

Brandon Gebhart –“Many Wyoming water users are developing new approaches and tools to sustain their operations in the face of a future with additional water supply uncertainty. They recognize SCPP as a tool to provide resources and information to help build innovative and creative solutions to adapt to that uncertain future. I applaud the work and collaboration between Wyoming water users and stakeholders, Wyoming SEO staff, Reclamation, and UCRC staff to improve the program for 2024.”

Counseling patience on the current #ColoradoRiver kerfuffles — John Fleck (InkStain.net) #COriver #aridification

Colorado River “Beginnings”. Photo: Brent Gardner-Smith/Aspen Journalism

Click the link to read the article on the InkStain.net website (John Fleck):

March 11, 2024

Despite the Sturm und Drang of last week’s competing proposals to the federal government for managing drought and climate change on the Colorado River, there’s a lot to be hopeful about.

On their faces, the Upper Basin and Lower Basin proposals have a lot of “Water’s for fighting over after all!” vibe. But if you take them “seriously but not literally”, to borrow a meme from recent political rhetoric, it’s clear there is much to be hopeful about.

Here’s the part I do take both seriously and literally. New Mexico’s representative in all of this, my representative, Estevan Lopez, said this:

The key understanding the gap between the “Water is for fighting over!” rhetoric of last week and Estevan’s comment is to remember two interlocking things about the two basin submissions to the U.S. Bureau of Reclamation.

TELL US YOUR PLAN BEFORE YOU’VE HAD A CHANCE TO DEVELOP IT

The first piece to understand is that we are in the midst of intense, difficult, and importantly closed door negotiations among the Colorado River Basin states. The negotiations have a long way to go. Asking the states to freeze and make public a position now puts them in a difficult position!

The reason for the need to make preliminary proposals public now, a couple of years before we need to finalize action on this stuff, is legitimate. The whiz kids at Reclamation need time to do the “what if” modeling, a key step in the administrative process of development a National Environmental Policy Act review, the so-called “Environmental Impact Statement”, or EIS. This can’t wait for the states to work out a deal. That’s the reason for the March 2024 it’s-not-a-deadline “please send us your ideas” deadline from Reclamation.

Given the remaining uncertainty, the states faced a dilemma – submit something close to a “best and final offer,” the place you hope to end up? Or submit a “tough initial negotiating position” – essentially your starting point.

The Lower Basin, with a longer history of interstate wrestling with water use reductions going back to the 2001 Interim Surplus Guidelines, submitted something closer to the former, reflecting the Lower Basin’s willingness to support the first tranche of needed cuts, but suggesting the Upper Basin should share in the second tranche if drought and climate change require us to dig deeper.

The Upper Basin, using substantially less water and operating largely independently in terms of their use of Colorado River water, don’t have the same experience in intrabasin negotiation. The Upper Basin submitted something like the latter. Suggesting that the entire burden of cuts fall on the Lower Basin is obviously not where we’re doing to end up, but it preserves a tough negotiating position.

LET’S MODEL IT!

The second important thing to remember, and that should give us pause about getting too worked up about the specifics right now, is that the whole point of this exercise is to sketch out some options that can be modeled to help inform decisions. It’s impossible to look at these proposals right now – even if we wanted to treat them as real and serious plans – and say what effect they would have.

That’s the point, at its best, of the NEPA process. Its purpose is to inform decisions.

For example, I’ve stared hard at one of the key differences between the two proposals – using total storage in Mead and Powell as the benchmark for making decisions about how to make cuts, versus using a larger suite of reservoirs. Without doing the modeling, I’m not sure I understand their practical implications. Perhaps the states, with internal modeling capabilities, have already done this, but it’s not public, so let’s model it and talk about it publicly. That’s what NEPA is for!

MY UPPER BASIN SYMPATHIES

I must declare my allegiances here. As a resident of the Upper Basin, it has been frustrating over the last decade to watch as the Lower Basin sucked the reservoirs down, only tapping the brakes fitfully, and never quite hard enough until the last few years.

But it is from that vantage point that I’ve worked hard with Upper Basin colleagues in recent years to make clear to my fellow residents of Wyoming, Utah, Colorado, and New Mexico the realities underlying some of our shared groupthink, because (to push a poker analogy to the breaking point), some of the things we treat as high cards – “the Lower Basin is overusing its compact allocation,” and “we routinely take shortages in dry years” – may not be.

Because, ultimately, the best way to act on my allegiance to the Upper Basin is to funnel it through the allegiance we all should have to the Colorado River Basin as a whole.

Map credit: AGU

Future of #LakeMead still unclear as negotiations flare — The Las Vegas Review-Journal #ColoradoRiver #COriver #aridification

Credit: Upper Colorado River Commisstion

Click the link to read the article on The Las Vegas Review-Journal website (Alan Halaly). Here’s an excerpt:

March 19, 2024

Colorado’s chief river negotiator doesn’t find the other side’s proposal for basinwide water cuts after 2026 plausible, she told reporters Tuesday. When it comes to updating how water from the Colorado River is allocated, the Upper Basin states — Colorado, New Mexico, Utah and Wyoming — have been wrapped in a divisive battle with the Lower Basin, which is composed of Nevada, California and Arizona. Both parties agree that the “structural deficit,” meaning the 1.5 million acre-feet of water lost to evaporation and transport, should translate to cuts made by the Lower Basin states. However, a main point of contention lies in whether Upper Basin states also must bear the brunt of cuts past the structural deficit.

States such as Colorado are at the mercy of snowpack and climate change to determine water availability, said Becky Mitchell, Colorado state’s Colorado River commissioner. That’s a far cry from a state like California, she said, which enjoys more certainty thanks to Lake Powell and Lake Mead, the two largest reservoirs in the country. Upper Basin states have estimated they suffer a 1.2 million acre-foot water shortage, on average, because of water loss to climate change.

“In short, our water users do not have security or certainty in their water supply because they absolutely have to live with what Mother Nature provides every year,” Mitchell said. “In contrast, we have Lower Basin contractors who’ve been provided a high level of certainty in water deliveries and, in turn, have drawn down Lake Mead.”

[…]

There are other nuances that differentiate the two proposals, such as how much water to release from Lake Powell that will trickle into Lake Mead, which supplies about 90 percent of Southern Nevada’s water…Mitchell’s group wants to base each year’s outflow on Lake Powell’s levels on Oct. 1 of each year, while Lower Basin states hope to base that on the contents of more than just one reservoir.

Nevada’s chief negotiator and Southern Nevada Water Authority General Manager John Entsminger told the Las Vegas Review-Journal on Tuesday that the Lower Basin states are analyzing the Upper Basin proposal in more detail.

Aspinall Unit operations update: 550 cfs through the Gunnison Tunnel

Grand opening of the Gunnison Tunnel in Colorado 1909. Photo credit USBR.

From email from Reclamation (Erik Knight):

Gunnison Tunnel diversions will be increasing by 150 cfs on Monday, March 25. This will increase the total diversion from 400 cfs to 550 cfs. For this change in diversion, releases from the Aspinall Unit will remain constant at 1150 cfs. This will result in a drop in river flows of about 150 cfs downstream of the Tunnel

Flows in the lower Gunnison River are currently above the baseflow target of 1050 cfs. River flows are expected to remain above the baseflow target after this increase in Tunnel diversions.

Pursuant to the Aspinall Unit Operations Record of Decision (ROD), the baseflow target in the lower Gunnison River, as measured at the Whitewater gage, will be 1050 cfs for March through May.

Currently, Gunnison Tunnel diversions are 400 cfs and flows in the Gunnison River through the Black Canyon are around 670 cfs. After this release change Gunnison Tunnel diversions will be 550 cfs and flows in the Gunnison River through the Black Canyon will be near 520 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

This scheduled release change is subject to changes in river flows and weather conditions. For questions or concerns regarding these operations contact:

Erik Knight at (970) 248-0629, e-mail eknight@usbr.gov

From #Snowpack to Tap — Reclamation #ColoradoRiver #ArkansasRiver #COriver #aridification

This video shows how the Bureau of Reclamation’s Water Crew helps prepare the Fryingpan-Arkansas Project collection system for springtime runoff. The Water Crew plows, snowshoes, shovels, and even bikes through the collection system to release water on an 87-mile journey from the Fryingpan River Basin in the snowy Rockies to Lake Pueblo on the dry Eastern plains.
Fryingpan-Arkansas Project via the Southeastern Colorado Water Conservancy District (Click to enlarge)

As states butt heads over #ColoradoRiver plans, water experts gauge impacts to #Colorado — Fresh Water News #COriver #aridification

From left, J.B. Hamby, chair of the Colorado River Board of California, Tom Buschatzke, Arizona Department of Water Resources; Becky Mitchell, Colorado representative to the Upper Colorado River Commission. Hamby and Buschatzke acknowledged during this panel at the Colorado River Water Users Association annual conference that the lower basin must own the structural deficit, something the upper basin has been pushing for for years. CREDIT: TOM YULSMAN/WATER DESK, UNIVERSITY OF COLORADO, BOULDER

Click the link to read the article on the Fresh Water News website (Shannon Mullane):

March 13, 2024

Colorado’s water and reservoirs are in the thick of disagreements over Colorado River management in a drier future.

All seven Western states in the Colorado River Basin agree that climate change is exacerbating conditions in the basin, and water users need sustainable, predictable water management. They agree that the current rules, which expire in 2026, didn’t do enough to keep reservoirs from dropping to critically low levels. They even agree that water cuts need to happen.

But they’re at loggerheads over how to share the pain — and have been for years. Now, the Lower Basin officials have proposed a plan calling on all basin users, including Coloradans, to make sacrifices.

“This is not a problem that is caused by one sector, by one state, by one basin. It is a basinwide problem, and it requires a basinwide solution,” John Entsminger, Nevada’s top negotiator, said during a news conference March 6.

Basin officials are negotiating Colorado River management in order to create new interstate water sharing rules that will replace the current agreements, which were created in 2007. The overburdened river system provides water to seven Western states, two Mexican states and 30 Native American tribes.

Basin states released competing proposals March 6, outlining their ideas for releasing, storing and cutting back on water use.

The Upper Basin proposal — put forward by Colorado, New Mexico, Utah and Wyoming — only includes cuts to the Lower Basin’s water use, although the four states would continue developing voluntary conservation programs.

The Lower Basin alternative — from Arizona, California and Nevada — looks at the amount of water stored in seven federal reservoirs. When that storage falls below 38% of total reservoir capacity, all seven states would conserve water to cut their collective use by 3.9 million acre-feet. One acre-foot roughly equals the annual water use of two to three households.

That’s a no-go for Upper Basin states, where water supply fluctuates yearly because it primarily relies on mountain snowpack. In 2020, a particularly dry year, the Upper Basin used 4.5 million acre-feet — much less than its legal allotment of 7.5 million acre-feet. In 2021, another drought year, the states had to cut back further.

That’s without any additional water cuts, like those proposed by the Lower Basin.

“When we’re looking at those years, like 2021 when our uses in the Upper Basin were at 3.5 million acre-feet, that represents almost a 25% cut,” Commissioner Becky Mitchell, Colorado’s top negotiator, said. “To cut further in a year like that could wreck communities and economies.”

Colorado’s role in the Upper Basin plan

The Upper Basin proposal calls for few changes in the upstream states.

The Upper Basin would keep taking steps to ensure Lake Powell, located on the Utah-Arizona border, could make its required releases downstream, and to reduce Upper Basin water use through voluntary, temporary and compensated cuts, like the system conservation pilot program.

The rest of the proposal is meant to offer guidance to the Lower Basin, Mitchell said.

In the past, officials have changed how water is stored and released at lakes Mead and Powell based on the reservoirs’ elevations. The Upper Basin plan links operations more closely to each year’s available water storage, a high priority for Colorado officials.

In years when Lake Powell is less than 20% full, the Upper Basin states suggested releasing as little as 6 million acre-feet of water downstream. Upper Basin states are legally obligated to let at least 7.5 million acre-feet flow to Lower Basin states (plus some for Mexico) annually, as averaged over a rolling 10-year period.

If reservoir storage dropped to certain trigger levels, Lower Basin states would also cut up to 3.9 million acre-feet in a year.

The approach is designed to replenish depleted water storage in reservoirs, like Mead and Powell. These two enormous reservoirs — which function like savings banks for water users — drained to a third of their volume in the early 2020s, prompting a crisis response among officials and ramping up concerns about water availability in the future.

It would also protect Lake Powell’s ability to release water downstream according to water law, Mitchell said.

“That protects Colorado users. That protects all the Upper Basin states’ users,” Mitchell said. “The rebuilt storage protects all 40 million people — that’s the way that we protect all 40 million is to have a safety net.”

A call for widespread cuts

The Lower Basin officials say that the entire Colorado River Basin — including Colorado and the other Upper Basin states — must cut water use.

In their proposal, Lower Basin officials said they would take responsibility for the structural deficit, which refers to water losses from factors like evaporation, by cutting back on their water use by 1.5 million acre-feet in some years.

Credit: Upper Colorado River Commisstion

In years when the total storage in the system drops below 38%, the Lower Basin says the Upper Basin states need to help out so the basin as a whole can cut 3.9 million acre-feet.

If this plan had been in place since 1971, the states would have started taking cuts around 2000. For most of the past 24 years, the Lower Basin would have taken annual cuts of 1.5 million acre-feet. The Upper Basin would only have faced shortages in 2020 and 2021, according to Lower Basin officials.

“It’s very easy to craft an alternative that doesn’t require any sacrifice, but that’s not what the Lower Basin alternative does,” said JB Hamby, California’s top negotiator, during a March 6 news conference. “The Lower Basin is home to three-quarters of the Colorado River Basin’s population, most of the basin’s tribes, and the most productive farmland in the country. Our proposal requires adaptation and sacrifice by water users across the region.”

What would the Lower Basin option mean for Colorado?

Officials have released written plans, but it will take modeling out many different water supply scenarios to understand the impacts of each proposal, according to water experts.

But under the Lower Basin plan, Colorado could be on the hook for cutting its use by hundreds of thousands of acre-feet, said Colorado water expert Eric Kuhn.

In one hypothetical low-storage scenario, the Lower Basin would cut its use by 1.5 million acre-feet, then the two basins would each conserve an additional 1.2 million acre-feet, Kuhn said.

If Colorado took on a third of the Upper Basin’s obligation — and this is a big “if” — it would mean cutting water use by nearly 400,000 acre-feet.

“If Colorado ever agreed to absorb a certain percentage of the final … cuts, it’ll have a big impact on the state,” Kuhn said. “It’s not theoretical; it would be quite significant.”

For reference, all of the cities, towns and industries in Colorado use a combined total of about 380,000 acre-feet per year from multiple water sources, including the Colorado River, according to the 2023 Colorado Water Plan.

Mandated cuts could even send states into litigation, which is the worst outcome, said one Colorado official. Once the issue moves to the courts, state officials can’t talk to each other, and their future could be in the hands of U.S. Supreme Court justices who may not have expertise in the complex realm of Western water law.

“We’ll talk 1-to-1 cuts when they’re down to 4.5 million acre-feet,” said Steve Wolff, general manager of the Durango-based Southwestern Water Conservation District, referring to the average amount of water used by Upper Basin states. “When you’re still using twice as much as us, why should we agree to a 1-to-1 cut?”

Peter Ortego, general counsel for the Ute Mountain Ute Indian Tribe, said basin tribes that have made agreements to share in future shortages could be impacted. Most tribal nations have senior water rights, which get water first in dry years and should be protected from most water cuts, he said.

Environmental groups say more needs to be done to protect rivers and freshwater resources, which provide vital habitat for wildlife in the arid West.

In recent, very dry years, Colorado trout fisheries, like the Yampa River, have been shut down because of low flows and warmer water temperatures in mid-to-late summer. If modeling shows that federal or state plans would leave less water in the rivers, that would be concerning, said Jennifer Pitt, Colorado River Program director for the National Audubon Society.

Going forward, Pitt and other water experts will be watching for updates from the Bureau of Reclamation’s analysis. That’s when they’ll know more about possible impacts to Colorado.

Until then, Coloradans need to keep one thing in mind, Pitt said.

“This is not Colorado against the rest of the West. This is Colorado, part of a river basin that is shared,” she said. “All those parties need each other to get through some challenging conditions in the future.”

Map credit: AGU

Upper Gunnison River Water Conservancy District forms collective to cover expensive snow survey flights — The Gunnison Country Times #GunnisonRiver #ColoradoRiver #COriver #aridification

Gunnison River in Colorado. Source: Bureau of Reclamation via the Water Education Foundation

Click the link to read the article on the Gunnison Country Times website (Bella Biondi). Here’s an excerpt:

March 13, 2024

Although the Upper Gunnison has proven the value of ASO flights, the agency — as well as many other water districts in Colorado — cannot pay for the costly technology alone. This year, the district created an Upper Gunnison Basin ASO funding partnership, a growing collective of local agencies that will divide the cost of running flights. 

Link to the Colorado Airborne Snow Measurement Program website

“For the Western Slope, it’s incredibly important to be able to predict annual hydrology so that we can live within our means on the river,” said District General Manager Sonja Chavez. 

The annual cost of conducting snow surveys for the East and the Taylor River watersheds exceeds $300,000. These basins, which encompass roughly 570 square miles, are prioritized because they typically hold the most snow and generate the largest amount of water in the spring…After a $50,000 investment from the water district, the Gunnison County Electric Association, the Lawrence Berkeley National Laboratory, the Upper Colorado River Commission and the Colorado Water Conservation Board (CWCB) helped cover the rest. Chavez said she plans to expand the partnership next winter.

Lower #ColoradoRiver Mainstream Evaporation and Riparian Evapotranspiration Losses Report — Reclamation #COriver #aridification

Click the link to access the report on the Reclamation website. Here’s the introduction:

The Colorado River System provides essential water supplies to approximately 40 million people, nearly 5.5 million acres of agricultural lands, hydroelectric renewable power, recreational opportunities, habitat for ecological resources, and other benefits across the southwestern United States and northwestern Mexico (Reclamation, 2012). While the annual flow of the Colorado River and its tributaries varies considerably from year to year, the Colorado River System is currently experiencing prolonged drought and low runoff conditions accelerated by climate change that have led to historically low water levels in Lakes Powell and Mead (Reclamation, 2021). The period from 2000 through 2022 is the driest 23-year period in more than a century and one of the driest periods in the last 1,200 years (Meko et al., 2007).

On August 16, 2022, the Bureau of Reclamation (Reclamation) and Department of the Interior announced several administrative actions for consideration to improve and protect the long-term sustainability of the Colorado River System (Reclamation, 2022a). These actions were identified in the context of the low reservoir conditions as described in Reclamation’s Colorado River Basin August 2022 24-Month Study.

The administrative actions in the Lower Basin included reviewing and prioritizing additional administrative initiatives that would ensure maximum efficient and beneficial use of urban and agricultural water, and address evaporation, seepage, and other system losses in the Lower Basin. As part of that action, this report provides an overview of evaporation and riparian evapotranspiration (ET) losses along the lower Colorado River mainstream. The report presents methodologies that have been used to develop those datasets; however, it does not make recommendations on how to implement or account for system losses from the lower Colorado River mainstream. Data regarding seepage to groundwater were not included in this report. Seepage along the mainstream of the lower Colorado River is not considered to be a loss from the system as water entering the aquifer will re-emerge further downstream within the Colorado River.

Estimates of lower Colorado River mainstream evaporation and riparian ET losses provided in this report were divided into five reaches, as follows:

  • Reach 1: Lake Mead
  • Reach 2: Hoover Dam to Davis Dam
  • Reach 3: Davis Dam to Parker Dam
  • Reach 4: Parker Dam to Imperial Dam
  • Reach 5: Imperial Dam to the Northerly International Boundary (NIB) with Mexico

1 The Colorado River Basin natural flow record is available at https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html.
2 For more information on the 24-Month Study Projections, see https://www.usbr.gov/lc/region/g4000/riverops/24ms-projections.html.

As the #ColoradoRiver shrinks, states continue to tussle over cuts — Jonathan P. Thompson (@Land_Desk) #COriver #aridification

Enigmatic artwork with Glen Canyon Dam in the background. Jonathan P. Thompson photo.

Click the link to read the article on The Land Desk website (Jonathan P. Thompson):

The two groups of Colorado River watershed states — the Upper Basin and the Lower Basin — have each come up with a respective preliminary plan for how to deal with a shrinking supply of water in the river and its tributaries. And, surprise surprise, they don’t agree: They both want the other team to take a bigger hit. 

Way back in early 1900s, the question facing these seven states was how to divide up the waters of the Colorado River, first between the two basins, then between the states within each basin. The 1922 Colorado River Compact answered that question. Sort of. The Compact is flawed in many ways, including that the folks who signed onto it thought there was a bunch more water than actually flowed in the river — even back then. 

I like to run this one again from time to time, just to remind folks how much the population of the West has grown over the last century. This is what the signers of the Colorado River Compact were dealing with as far as water users go — compared to some 40 million users now. Source: USGS.

Now there’s even less water and higher consumption. If the river users don’t make some major cuts and soon, the reservoirs will dry up and leave the Southwest’s cities, towns, and farms to fight over the diminishing scraps. 

“We can no longer accept the status quo of the Colorado River operations,” said Becky Mitchell, Colorado’s representative on the Upper Colorado River Commission, in a press release. “If we want to protect the system and ensure certainty for the 40 million people who rely on this water source, then we need to address the existing imbalance between supply and demand.” 

Map of the Colorado River drainage basin, created using USGS data. By Shannon1 Creative Commons Attribution-Share Alike 4.0

So now the question facing the states is similar to the one they asked 102 years ago, but with a twist: How should those deep cuts be divided up now that global heating is depleting the river’s flow? 

It’s a tough question with no easy answers. And it’s all made more difficult by a lack of clarity regarding the definition of terms in the original Compact such as “beneficial consumptive use” and “surplus,” and how to measure those things. Where does use of tributaries that run into the Colorado below Lee Ferry, such as the Gila River, the Little Colorado, and the Virgin River fit into all of this?

The “natural flow” is the estimated amount of water that would flow past Lee Ferry (below Glen Canyon Dam) if there were no upstream dams, diversions, or withdrawals. The Colorado River Compact was based on the assumption that about 16 million acre-feet flowed past Lee Ferry per year (which is not unreasonable given the abnormally high flows between 1906 and the late 1920s). In fact, the 1906-1923 median is about 14.5 MAF (with an average of about 14.7 MAF). And the 1991-2023 average is 13.2 MAF. Yikes! Source: Bureau of Reclamation.

Until those definitions are agreed upon, we won’t really know whether the Lower Basin is using the amount of water allocated to it in the Compact (8.5 million acre-feet), or significantly more than that (10.1 million acre-feet). Until we know what “surplus” means, we won’t know who is responsible for ensuring Mexico gets its allocated share. So far there is no agreement on those definitions. (For a detailed and intelligent take on this, please see Eric Kuhn’s and John Fleck’s piece on Fleck’s Inkstain blog). 

The good news is that the current proposals aren’t final; there is still time for the basins to negotiate. And the two basins’ representatives are inching closer to accord, finding harmony where it previously eluded them. The two alternatives agree:

  • That consumption cuts should be triggered not by forecasted water levels in Lake Mead, but by current hydrologic conditions throughout the entire system. However, they differ on how to measure those conditions. 
  • And that the Lower Basin should include evaporation and seepage — totaling an estimated 1.3 million acre-feet per year — in its consumptive use, as the Upper Basin has always done. They plan to offset this loss by cutting consumption by 1.5 million acre-feet per year. 
Total losses (evaporation and riparian ET) from Reach 1 through Reach 5. Credit: USBR

The main sticking point comes when reservoirs shrink to critically low levels:

  • Under the Upper Basin’s plan, as storage levels drop, they would release progressively less water from Lake Powell. So if water storage is 81% to 100% full, then they’d release 8.1 to 9 MAF from Glen Canyon Dam, giving the Lower Basin their full allocation. But if storage is less than 20% full, it would release just 6 MAF per year, giving the Lower Basin 2.5 MAF less than their allocation that year — presumably forcing them to cut that same amount of consumption. Whether and how much consumption the Upper Basin would have to cut under this scenario would depend on how much water is actually in the river. It’s important to note that the Upper Basin does not and has never used its full allocation of 7.5 MAF per year.
  • Under the Lower Basin’s plan, when the system is between 38% and 70% full, the Lower Basin would cut its consumption by 1.5 MAF per year. When system water levels drop below that, then the Lower Basin would continue its 1.5 MAF per year cuts, and the two basins would share any cuts above that up to a maximum of 3.9 MAF per year. So under the maximum cuts, the Lower Basin would reduce usage by 2.7 MAF while the Upper Basin would cut use by 1.2 MAF. 
The Upper Basin’s alternative, summed up. Source: Upper Colorado River Commission.
The Lower Basin’s proposed framework for reductions. The Lower Basin would make all of the cuts (1.5 MAF per year) down to 38%, after which the two basins would evenly split any reductions beyond 1.5 MAF. Source: Lower Basin states.

Both basins’ alternatives mention and acknowledge that many tribal nations’ water rights remain unfulfilled, and yet say little about how the situation might be rectified. And each Basin says its respective plan is the most sustainable, is most likely to keep Hoover and Glen Canyon dams from being compromised, and complies with the Law of the River — or the set of treaties, compacts, and court cases that govern how the river is used. 

Yet the sustainability or health of the Colorado River as an entity — a breathing, flowing, living being — is barely mentioned. Little thought is given to the ecosystems, cultures, and creatures the river sustains. I realize that’s not the point of this exercise. And yet, ultimately, it will be the River itself that lays down the law, not century-old compacts or legal precedents or antiquated water rights. Perhaps we ought to pay it a little more respect. 

FURTHER READING: 

  • Ya gotta check out the Colorado River Science wiki. All kinds of good resources there. 
  • Ditto for On the Colorado, a clearinghouse for all kinds of information on the River.
  • Aspen Journalism’s Heather Sackett did a thorough writeup of the two proposed alternatives. 
  • You want the wonky, nitty-gritty details on Western water? Then go to John Fleck’s Inkstain blog and spend some time. 
  • And finally, a Land Desk primer on the Colorado Compact. For paid subscribers only, I’m afraid:

The Colorado River Compact 

JONATHAN P. THOMPSON March 8, 2024

Colorado River, Black Canyon back in the day, site of Hoover Dam

Editor’s Note: This essay first appeared in the High Country News November 11, 2022.

Read full story

Romancing the River: Running the Real River — George Sibley (Sibley’s Rivers) #ColoradoRiver #COriver #aridification #CRWUA2023

DALLE Image by Scott Harding American Whitewater

Click the link to read the article on the Sibley’s Rivers website (George Sibley):

March 13, 2024

I really like the AI image above, created by a couple creatives at American Whitewater, Scott Harding and Kestrel Kunz. for a presentation at the Colorado River Water Users Association convention in January. It shows ‘the people who run the river’ running the river. But if you have ever been in that whitewater situation, you know that the river is really in charge; you run the river on the river’s terms. The guy standing up in the back of the boat is in charge of the boat, giving the others in the boat commands like ‘Five forward (strokes of the oars) on the right!’ ‘Two back on the left!’ ‘Everybody three forward!’ – trying to keep the boat on a ‘line’ he or she perceives through the rocks of the rapids. Thinking like the river to run the river.

We can draw some obvious analogies to Colorado River management – as Scott and Kestrel do in the picture above of the people in suits who ‘run the river.’ But the analogy breaks down quickly around the fact that they are all – we are all – in a boat without a boatman. Instead of all those who are running the river following directions from one person who is using his past experience to pick a line through the rocky places – ‘A 100,000 acre-feet to the Navajo!’ ‘Everybody cut 10 percent!’ – we are doing it through committees, groups, divisions, maybe some factions by James Madison’s classic definition (groups whose acts are ‘adverse to the rights of other citizens, or to the permanent and aggregate interests of the community’).

In this case we have the Lower Colorado River Basin on one side of the raft, the Upper Basin on the other side; they are each forming a perspective on the rocky places ahead and describing a line through them that requires issuing some advice or orders to those with oars on both sides of the boat about forward or backward actions, resulting mostly in quite a lot of noise, in which the intelligence from both sides gets rendered unintelligible….

There are various possible resolutions to such a situation. Some will say we have to have a boatman, one person to whom we will all listen and for whom we will all act obediently. On the real river, boatmen have to earn their right to be that person through experience. But on the metaphorical boat on the allegorical river, it is not always easy to select a boatman to get through the hard places because – what experience counts? What background is necessary and sufficient? What demonstrable skills? And there is always a loud narcissist in the boat who trumps the discourse by trumpeting that he or she is ‘the one, the only one that can get you through this’; those ‘strongmen’ appeal to many in the boat, when the better idea might be to just pull off the river before the hard place, unpack the lunch along with the situation, and work out a plan democratically before plunging in….

That is, in a sense, what is going on today in the Colorado River Region (natural basin plus out-of-basin extensions). Everyone knows that there are hard places as we all try to face up to some hard realities the river is imposing on us (at least partly because of hard things we have imposed on the river).

After a feel-good conference this January of the Colorado River Water Users Association, the seven basin states and representatives from the basin’s 30 First People nations sat down to work out a new set of ‘Interim Guidelines’ for an ‘interim’ beginning in 2027, to replace the tattered, battered and bandaged Interim Guidelines that the Colorado River waterworks have been working off of since 2007 with a ‘use by’ date of 2026.

The structural deficit refers to the consumption by Lower Basin states of more water than enters Lake Mead each year. The deficit, which includes losses from evaporation, is estimated at 1.2 million acre-feet a year. (Image: Central Arizona Project circa 2019)

That larger gathering hung together for several sessions; then, as I understand it, the three Lower Basin states withdrew to figure out how to handle a ‘structural deficit’ that is about one-fourth of their 8.5 million acre-feet (maf) allotment from the 1922 Colorado River Compact, which deficit they finally conceded was their responsibility – just their concession being a major step forward. The ‘other side of the boat,’ the Upper Basin states, began meeting on their own.

Now, just this week, the Basins have each submitted draft plans for post-2026 river management to the Bureau of Reclamation – the Upper Basin Tuesday March 4, and the Lower Basin Wednesday March 5.

I wanted to get something online this same week about this so my faithful readers would not think that I am asleep at the wheel or lost in river history, but there is no way to even obtain and read these plans, let alone try to make sense of them together, before my webmeister’s Friday deadline. So I’ll be back with you either next week or the week following with my two-bits on what’s going on.

Total losses (evaporation and riparian ET) from Reach 1 through Reach 5. Credit: USBR

But we can do a little backgrounding now. The ‘structural deficit’ the Lower Basin has finally conceded it must deal with is a substantial omission not covered in either the 1922 Compact nor in the subsequent elements of the Law of the River. It is, first, a compilation of all the ‘system losses’ from evaporation, bank storage, riparian vegetation, et cetera, from Mead Reservoir to the Mexico border – estimated by the Bureau of Reclamation to be around 1.3 million acre-feet (maf).

It also includes, second, up to 750,000 acre-feet that is the Lower Basin’s share of the Mexican obligation. Responsibility for these has been dismissed by the Lower Basin as being covered by ‘surplus flows’ – anything over the 7.5 maf the Upper Basin is committed to send through the canyons. For most of the 20th century this surplus was legitimate: water not yet being used by the Upper Basin and the Central Arizona Project, plus the occasional blessings of big water years. But for roughly the last quarter century that surplus has largely been a paper accounting; the ‘structural deficit’ that emerged was basically the Bureau drawing down storage in a time of drought to keep nurturing the ‘surplus’ fiction while praying for snow.

The 2007 Interim Guidelines were created to try to address this problem – but without really addressing it. The Guidelines were kind of a shell game, ‘balancing’ the contents of Mead and Powell reservoirs, with tipping points in the storage of both that would precipitate shortages being imposed on the Lower Basin states – but doing obeisance to California’s senior water rights by shorting the other two states first and most. And they continued releasing the substantial ‘structural deficit’ water to not force the Lower Basin states cut back on their own.

These ineffective guidelines led to the Bureau’s realization in 2022 – the centennial year of the Compact – that they might be two or three years from losing the storage in the big reservoirs entirely for much of the year, resulting in the quasi-panicky call to the seven states to cut consumption within a year by 2-4 maf.

I will not go through again all the plans and counter-plans that were proposed and analyzed to answer the Bureau’s call, but do want to call attention to the fact that the situation did revive a spate of ‘Caliphobia,’ when six of the Basin states prepared a plan for a proportionate sharing among the Lower Basin states of cuts that amounted to the structural deficit, but California would only participate if its substantial senior water rights were honored, with the other two states bearing the brunt of the cuts.

The Compact’s Signers. Photo via InkStain

This was – for me, at any rate – just more evidence of the extent to which the Colorado River Compact is a failed document. It was Caliphobia that had brought the seven states together in 1922 – California unenthusiastically – to create the Compact. All seven states had variations on the doctrine of prior appropriation as their foundational water law, and knew that the logic of the law meant they had to honor each other’s senior appropriations. But California was growing so fast, with claims on so much Colorado River water, that the other six states were concerned that there might not be enough water left for their own slower development.

Upper Basin States vs. Lower Basin circa 1925 via CSU Water Resources Archives

Their goal in coming together was to create a division of the river among the seven states that would override appropriation law at the interstate level, eliminating a seven-state appropriation horserace in which California was already lapping the field. California participated in the compact negotiations because Congress said there would be no money to build the big flood control and storage structures California desperately wanted until the seven states were in agreement on how the river’s water would be apportioned.

They were, however, unable to do the seven-state division they needed. They each came from their own state with estimates of their future needs that, in total, added up to half-again more water than even the 18 maf pluvial river carried in that first quarter of the 20th century. They were operating on dreams, not data, and after a couple days of critiquing each other’s numbers and defending their own, that gave up on the seven-state division.

The best they were able to do, in their November ten-day eleventh-hour do-or-die charrette was the two-basin division that gave the four states above the canyons some protection against California growth, but left the other two states below the canyons in the cage, as it were, with the thousand-pound gorilla, California. The Compact goal of ‘promoting interstate comity’ failed when Arizona refused to even ratify the Compact. And as average flows declined from the 1930s on, the Upper Basin’s Compact charge to ‘not cause the flow of the river at Lee Ferry to be depleted below’ the Lower Basin’s apportionment began to make the Upper Basin states feel more like juniors shorted to fulfill a senior water right than participants in an ‘equitable apportionment.’

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Add in the failure to even mention the basin’s substantial system losses, and the Compact and subsequent Law of the River have not done much to ‘remove causes of present and future controversies,’ culminating in the situation we are in now, with California playing the seniority card on the other states, the Upper Basin and Lower Basin having different ideas about what it actually means to ‘not cause the flow of the river at Lee Ferry to be depleted below’ an average of 7.5 maf/year, and no one really wanting to face the fact that the Compact was written for a river half-again larger than the river we have now – with a modest but steady decline in this river as we continue to warm the world around it. We are going to have to impose, and accept, significant shortages that will have impacts on all of us, on the way we eat nationwide and how much we pay, as well as how we use water everywhere in the region.

What is truly ‘equitable’ when it comes to administering shortages? Or cutting right to the chase – to what extent should the appropriation doctrine dominate the discourse? Is ‘first-come-first-served’ to be the only measure for ‘equitable allocation’?

To put the question another way: could we acknowledge a distinction between water-use issues and all-river issues? Water-use issues can occur between agricultural users, and between agricultural and urban areas, and between urban areas. We have decided culturally to resolve those kinds of issues through the first-come-first-served laws, and whether that is the best way to resolve issues over water use or not, it is the way we do it. (Although it should be noted that, among multi-generation neighbors, with century-old water rights differing by a year or two, seniors seldom place ‘calls’ on their junior neighbors; they work out ‘gentlemen’s agreements’ to share the available water. Appropriation law can be brutal when strictly enforced.)

But all-river issues are matters above and beyond questions of prioritizing water use. Discovering that we are dealing with a river that is only two-thirds the size of the river the Compact was created for is an all-river issue. Trying to figure out how to do long-delayed water justice for 30 First People nations of varying sizes (with two-thirds of them in one state) on a fully appropriated river is an all-river issue. Managing for the unknown but unfolding consequences of a changing, warming climate is an all-river issue.

All-river issues are everyone’s problems, created and perpetrated by everyone, whether consciously or unconsciously; and in a just world everyone would share the pain of resolution in some equitable and proportionate way. With an all-river issue, ‘seniority’ just means the water user has been part of the problem, consciously or unconsciously, for a longer time.

I have some thoughts about how we could deal with some of our all-river issues, which I will no doubt unload on you over the next several posts, but I hope that if you have thoughts on it, you will unload them on me in comments below.

And I also hope some of the people actually at the table(s) are also trying to think beyond the limitations of the Compact and of the foundational law of the river, the prior appropriation doctrine that the Compact wanted to address but couldn’t. Like Becky Mitchell, Colorado’s main negotiator, said, ‘We must plan for the river we have, not the river we dream of.’

Colorado River “Beginnings”. Photo: Brent Gardner-Smith/Aspen Journalism

#ColoradoRiver basin states offer divergent plans to govern operations after 2026 — #Colorado Politics — #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Click the link to read the article on the Colorado Politics website (Marianne Goodland). Here’s an excerpt:

The U.S. Bureau of Reclamation set a deadline of Monday for the seven states to come up with plans, but a hoped-for joint plan was not in the cards. By the end of 2024, the Bureau of Reclamation anticipates having what’s called a draft “environmental impact statement” that will present alternatives for how the Colorado River will operate in the decades to come. Those new guidelines will also determine the management and facilities of the two reservoirs, as well the Hoover and Glen Canyon dams…

Upper Basin plan

The plan submitted by the Upper Basin states calls for the following:

• A commitment from the Upper Basin states to help preserve the ability to make releases from Lake Powell, the nation’s second-largest reservoir that provides power through the Glen Canyon dam

• For Lake Powell: Modeled releases from Lake Powell that are based on hydrologic conditions and designed to rebuild storage to protect Lake Powell’s ability to make releases consistent with the Law of the River, as dictated by the 1922 Colorado River compact

• Lake Mead: Modeled Lower Basin operations adapted from a concept first provided by the Lower Basin States based on the combined storage of Lake Powell and Lake Mead…

The Lower Basin plan

Tom Buschatzke, the director of the Arizona Department of Water Resources and the state’s principal negotiator on matters relating to the Colorado River, said while he has not yet fully examined the upper division states’ alternative plan, he told Colorado Politics he is disappointed by what he’s seen so far.

• Addresses the structural deficit in the Lower Basin

• Operates the reservoirs based on system contents, rather than elevations at Lake Powell and Lake Mead

• Shared water use reductions broadly

• Creates provisions for the storage and delivery of stored water

• Releases from Lake Powell that are adaptable to a broad range of hydrology and “hydrologic shortages”

The alternative dictates cuts calculated by state — every state, not just those in the Lower Basin — depending on how much the levels drop at Lake Mead.

Lower basin calls for upper basin cuts; upper basin says ‘no way’: #ColoradoRiver basin states submit competing proposals for reservoir operations post-2026 — @AspenJournalism

Glen Canyon Dam impounds the Colorado River to create Lake Powell. In a proposal to the U.S. Bureau of Reclamation about reservoir operations, upper basin water managers say releases from Lake Powell should be based on how full the reservoir is on Oct. 1 each year. CREDIT: ALEXANDER HEILNER/THE WATER DESK, WITH AERIAL SUPPORT BY LIGHTHAWK

Click the link to read the article on the Aspen Journalism website (Heather Sackett):

March 6, 2024

In two separate proposals for how the nation’s two largest reservoirs should be managed, the upper and lower Colorado River basin states agree on a couple things, but can’t find common ground on whether the upper basin should take cuts when reservoir levels fall.

Proposals submitted to the U.S. Bureau of Reclamation by the upper basin states (Colorado, Utah, Wyoming and New Mexico) and the lower basin states (California, Arizona and Nevada) each say that the current guidelines’ method of basing operations on 24-month forecasts and setting shortages based on critical elevations of Lake Powell and Lake Mead should be tossed out in favor of using real-time water storage levels to determine releases and who takes how much in cuts. Both proposals say that the lower basin must cut its use by 1.5 million acre-feet in most years.

But the similarities stop there. Lower basin water managers say all seven states that use the Colorado River must share cuts broadly under the most critical system conditions, while upper basin officials maintain they do not have to cut their water use because they have never used the entire 7.5 million acre-foot apportionment given to them under the Colorado River Compact.

The separate proposals came after the seven basin state representatives could not reach a consensus after months of negotiations on how to operate the reservoirs after 2026. In recent months, water managers have focused on figuring out a new plan for reservoir management because the current guidelines from 2007 were only intended to last 20 years. In the context of a historic drought and climate change, the 2007 guidelines, along with the emergency Band-Aid that was 2019’s Drought Contingency Plan, have not been enough to keep reservoir levels from plummeting and bringing the system to the brink of collapse.

Total losses (evaporation and riparian ET) from Reach 1 through Reach 5. Credit: USBR

In its proposal, the lower basin has committed to doing something that the upper basin has long called for: owning the amount of water lost to evaporation and transit. A recent Reclamation study put evaporation and transit losses in the lower basin — which are currently unaccounted for on any balance sheets of supply and demand — at about 1.3 million acre-feet per year.

The lower basin’s proposal says it will cut its use by 1.5 million acre-feet when total system storage is between 38% and 69%. But if reservoir levels dip lower than 38% full, the lower basin wants additional cuts to be split evenly between the upper and lower basins, up to 3.9 million acre-feet. As of Tuesday, Lake Powell was nearly 34% full and Lake Mead was about 37% full.

“The Lower Basin Alternative creates resiliency and proposes climate change is a shared responsibility of all those that depend on the Colorado River,” JB Hamby, the Colorado River commissioner representing California, said in a prepared statement. “Each basin, state and sector must contribute to solving the challenges ahead. No one who benefits from the river can opt out of saving it.”

Upper basin water managers disagree, saying their water users are already being squeezed by climate change and are forced to take shortages in dry years because the water simply isn’t there. Upper basin officials have long maintained that most of the blame for the system crashing should be placed on lower basin overuse.

“I want to be very clear that the upper division states have always been in full compliance with the 1922 Colorado River Compact and, again, are currently using 3 [million] to 4 million acre-feet less than our compact apportionment,” Amy Ostdiek, Colorado Water Conservation Board section chief for interstate, federal and water information, said at a press conference explaining the upper division alternative. “There’s no mechanism to make mandatory water cuts in the upper basin beyond those that already occur each year.” [ed. emphasis mine]

From left, Colorado River negotiator for California JB Hamby, Arizona’s Tom Buschatzke and Colorado’s Becky Mitchell. A proposal from the lower basin states about reservoir operations says the upper basin should also take cuts to its water use if reservoir levels fall below 38% full. CREDIT: TOM YULSMAN/THE WATER DESK

Conservation promises

The upper basin’s proposal, however, says the four states will pursue “parallel activities”that include voluntary, temporary and compensated reductions in use, although the upper basin states do not offer a specific amount of water that they will conserve. This would be separate from the post-2026 guidelines process.

The upper basin has dabbled in recent years with two such conservation programs: demand management and system conservation. In 2019, the state of Colorado embarked on a multiyear feasibility study of a voluntary and temporary program — known as demand management — that would pay water users to cut back and bank the conserved water in Lake Powell. That program is currently shelved without having been implemented.

In 2023, the Upper Colorado River Commission restarted the System Conservation Program, which pays water users — nearly all of them in agriculture — to cut back. With this program, there is no guarantee the conserved water makes it to Lake Powell. The program saved about 38,000 acre-feet in 2023, at a cost of nearly $16 million. System Conservation will take place again this year.

The upper basin proposal, which officials say mitigates the risk of either reservoir reaching dead pool, bases both cuts to lower basin use and releases from Lake Powell on how full the reservoirs are on Oct. 1 of each year.

“We’re also looking to operate Lake Powell and Lake Mead based on observed conditions instead of unreliable forecasts,” Ostdiek said.

Under the upper basin’s proposal, if the two reservoirs combined are more than 90% full, no lower basin reductions will occur; if they are 70% to 90% full, lower basin cuts increase up to 1.5 million acre-feet; at 20% to 70% full, lower basin cuts remain static; and if the reservoirs are less than 20% full, lower basin cuts increase up to 2.4 million acre-feet a year, on top of the initial 1.5 million-acre-foot cuts. Under the upper basin proposal, those four states do not take any cuts, even as reservoir levels fall. 

That is in contrast with the lower basin’s proposal which would require cuts beyond 1.5 million acre-feet to be split evenly between the upper and lower basins.

If Lake Powell is 81% to 100% full on Oct. 1, then releases would be between 8.1 million and 9 million acre-feet; at 20% to 80% full, releases would be between 6 million and 8.1 million acre-feet; and if the reservoir is less than 20% full, just 6 million acre-feet would be released.

The lower basin proposal for releases from Lake Powell is based on the total amount of water in the upper basin Colorado River Storage Project Act reservoirs: Flaming Gorge, Blue Mesa, Navajo and Lake Powell. If these upper basin reservoirs are more than 80% full, releases from Lake Powell would be between 8.5 and 11 million acre-feet; if reservoirs are between 30% and 80% full, releases would be between 7 and 8.5 million acre-feet; if reservoirs are between 20% and 30% full, releases would be between 6 and 7 million acre-feet and if storage is less than 20% full, 6 million acre-feet would be released.

Current reservoir operations are based on Reclamation’s “24-month Study,” a monthly forecast that predicts a range of probabilities for reservoir storage levels and “balancing tiers,” which lay out who takes what shortages if reservoirs fall below certain elevations.

The two proposals will be reviewed by Reclamation, the federal agency that manages many of the West’s dams and reservoirs, as part of the National Environmental Policy Act process for creating the new post-2026 guidelines for reservoir operations.

Although the upper and lower basins did not reach consensus before the March 11 deadline and instead submitted two different proposals, both sides say they are still open to continuing negotiations.

“Although our proposal can stand on its own, it was also designed to promote the development of a seven-state consensus alternative, which is a goal we all still seek to achieve,” Wyoming Commissioner Brandon Gebhart said in a prepared statement.

This story ran in the March 8 edition of The Aspen Times, the Vail Daily.

Map credit: AGU

Upper Division #ColoradoRiver States Propose Alternative for Sustainable Operations of Post-2026 Operations of #LakePowell and #LakeMead #COriver #aridification

Credit: Upper Colorado River Commisstion

Click the link to read the release on the Upper Colorado River Commission website:

This week, the Upper Division States of Colorado, New Mexico, Utah, and Wyoming submitted to the Bureau of Reclamation an Alternative for Post-2026 Operations of Lake Powell and Lake Mead. The UDS Alternative proposes operations for Lake Powel and Lake Mead designed to help provide water supply certainty and sustainability in the face of a drying and uncertain future.

The purpose of the Upper Division States Alternative is to provide a set of modeling assumptions and operating parameters to the Bureau of Reclamation for Post-2026 Operations of Lake Powell and Lake Mead as part of the review process required under the National Environmental Policy Act (NEPA).

Separate from this NEPA process, the Upper Division States (UDS) will also pursue Parallel Activities. Parallel Activities are other activities the Upper Division States might take under certain conditions. Examples include potential releases and recovery at the Colorado River Storage Project Act (CRSPA) Initial Units and voluntary water conservation programs that would help to protect the ability of Lake Powell to make releases.

The Upper Division States Alternative provides:

Management of the reservoirs to address the existing imbalance between water supply and demands in the Lower Basin;

● Operations based on actual conditions—instead of unreliable forecasts—to ensure that Lake Powell and Lake Mead are operated sustainably;

● Efforts to rebuild storage at Lake Powell to protect the reservoir’s ability to provide water to Lake Mead;

● Reliance on the best available science and information, including impacts caused by climate change;

● Consistency with the Law of the River;

● Accounting of Upper Basin’s hydrologic shortages, which average an estimated 1.2 million acre-feet each year; and

● Acknowledgement of the settled but undeveloped Tribal water rights in the Upper Basin.

“We can no longer accept the status quo of Colorado River operations,” said Becky Mitchell, Colorado’s Commissioner to the Upper Colorado River Commission. “If we want to protect the system and ensure certainty for the 40 million people who rely on this water source, then we need to address the existing imbalance between supply and demand. That means using the best available science to work within reality and the actual conditions of Lake Powell and Lake Mead. We must plan for the river we have – not the river we dream for.”

Estevan Lopez, New Mexico’s Commissioner, said, “The Colorado River Basin is at a critical juncture. The UDS Alternative seeks to acknowledge the Upper Basin’s realities, including hydrologic shortages, protect Upper Basin interests, and contribute towards future sustainability of the entire basin. We look forward to working with our sister Lower Basin States to resolve differences in approach and create a 7-state consensus alternative.”

“This is a pivotal moment for Utah and the entire Upper Basin,” said Gene Shawcroft, Utah’s Upper Colorado River Commissioner. “Our proposal represents a balanced approach, combining immediate action with long-term planning to ensure the sustainability of both Lake Powell and Lake Mead. It’s about adapting to the realities we face today and securing a water-resilient future for our region.”

The Upper Division States are committed to working with partners in developing a preferred alternative. The UDS Alternative is available in detail on the Upper Colorado River Commission’s website, along with an infographic.

Colorado River “Beginnings”. Photo: Brent Gardner-Smith/Aspen Journalism

Reclamation awards construction contract for Arkansas Valley Conduit treatment facilities: President Biden’s Bipartisan Infrastructure Law supporting major water infrastructure project to provide clean, reliable drinking water to 39 communities in southeastern #Colorado

Arkansas Valley Conduit map via the Southeastern Colorado Water Conservancy District (Chris Woodka) June 2021.

Click the link to read the release on the Reclamation website (Anna Perea and Darryl Asher):

Feb 29, 2024

LOVELAND, Colo. — The Bureau of Reclamation has awarded a contract for the construction of water treatment and connection facilities for the Arkansas Valley Conduit Project to Thalle Construction for $28,710,676. This contract, partially funded by President Biden’s Bipartisan Infrastructure Law, funds construction of a backflow preventor connecting the main trunkline to Pueblo Water’s system, and a treatment facility to address specific water treatment needs for the Project.  

The backflow preventer will be constructed at 36th Lane and U.S. Highway 50, east of Pueblo. The treatment facility will be located along the AVC pipeline route about 4 miles east of 36th Lane. The treatment process will prepare the water for conveyance through the trunkline to Project communities and ensure compatibility of the water with the AVC participants’ water systems.

“We’re extremely pleased to be able to move forward with multiple features of the Arkansas Valley Conduit,” said Jeff Rieker, Eastern Colorado Area Office Manager. “The momentum of making this connection to the eastern end of Pueblo’s water system while downstream pipes are being placed and additional designs are being developed really speaks to the collaborative efforts of all those involved.”

2022 three-party contract between Reclamation, Southeastern Colorado Water Conservancy District Board and the Pueblo Board of Water Works (Pueblo Water), eliminates the need for over 24 miles of pipeline by utilizing Pueblo Water’s existing infrastructure. The water will be either Fryingpan-Arkansas Project water or from participants’ water portfolios, not from Pueblo Water’s resources. 

“This is another important step forward for the Arkansas Valley Conduit, and vital to begin providing high-quality drinking water to the people of the Lower Arkansas Valley. The Southeastern District has tremendous appreciation for the work that Reclamation and our congressional delegation have done to keep this project moving forward,” said Bill Long, President, Southeastern Colorado Water Conservancy District.

In addition to the contract for these facilities, in January, Reclamation awarded a $4.6 million contract to Central Geotechnical Services, LLC to locate and complete subsurface utility engineering surveys for underground utilities along a 34-mile stretch of the Arkansas Valley Conduit. Colorado legislation, SB 18-167, enacted in 2018, set new standards for entities conducting underground excavation.

Arkansas River Basin via The Encyclopedia of Earth

2024 #COleg: #Colorado lawmakers approve resolution backing efforts to restore #GrandLake’s clarity — Fresh Water News

Grand Lake and Mount Craig. CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=814879

Click the link to read the article on the Water Education Colorado website (Jerd Smith):

Colorado lawmakers OK’d a measure this week backing efforts to restore Grand Lake, the state’s deepest natural lake once known for its clear waters.

Advocates hope the resolution will help fuel statewide support for the complicated work involved in restoring the lake and give them leverage with the federal government to secure funding for a new fix.

The resolution is largely symbolic and doesn’t come with any money, but it adds to the growing coalition of water interests on the Western Slope and Front Range backing the effort.

After more than a year of work, Mike Cassio, president of the Three Lakes Watershed Association, said he is hopeful the resolution will create a new path forward after years of bureaucratic stalemate. The association advocates on behalf of Grand Lake, Shadow Mountain and Lake Granby.

“It’s been a long process, but this resolution puts the state legislators in support of what we are trying to do and we will be able to take that to our congressional representatives,” Cassio said.

The measure was carried by Sen. Dylan Roberts, a Democrat from Frisco, and House Speaker Julie McCluskie, a Democrat from Dillon.

“I’m really encouraged with all the work that has been done in the past few months and I think it will hopefully lead to more progress,” Roberts said.

Colorado-Big Thompson Project map. Courtesy of Northern Water.

Owned by the U.S. Bureau of Reclamation and operated by Northern Water, what’s known as the Colorado-Big Thompson Project gathers water from streams and rivers in Rocky Mountain National Park and Grand County, and stores it in Lake Granby and Shadow Mountain Reservoir. From there it is eventually moved into Grand Lake and delivered via the Adams Tunnel under the Continental Divide to Carter Lake and Horsetooth Reservoir, just west of Berthoud and Fort Collins, respectively.

On the Front Range, the water serves more than 1 million people and thousands of acres of irrigated farmlands. But during the pumping process on the Western Slope, algae and sediment are carried into Grand Lake, clouding its formerly clear waters and causing algae blooms and weed growth, and harming recreation.

Advocates have long been frustrated at the failure to find a permanent fix to the lake’s clarity issues, whether it’s through a major redesign of the giant federal system or operational changes.

The Bureau of Reclamation, Northern Water, Grand County and other agencies and local groups have been working since 2008 to find a way to keep the lake clearer, and Northern Water and others have experimented with different pumping patterns and other techniques to reduce disturbances to the lake’s waters.

Now an even broader coalition has come together, Cassio said, led by Grand County commissioners and Northern Water’s board of directors.

“Northern Water is fully committed to the continued and collaborative exploration of options to improve clarity in Grand Lake and water quality in the three lakes,” said Esther Vincent, Northern Water’s director of environmental services.

Last year, a technical working group reconvened, and is now studying new fixes that may be possible, including taking steps to reduce algae growth and introduce aeration in Shadow Mountain, a shallow artificial reservoir whose warm temperatures, weeds and sediment loads do the most damage to Grand Lake, Cassio said.

Though much more work lies ahead, the work at the legislature is critical, he said.

“This resolution is one piece of the puzzle,” Cassio said. “We’re at the finish line and everybody is coming together. It’s a wonderful thing.”

More by Jerd SmithJerd Smith is editor of Fresh Water News. She can be reached at 720-398-6474, via email at jerd@wateredco.org or @jerd_smith.

On the #ColoradoRiver, there are no Simple Disputes — Eric Kuhn (InkStain.net) #COriver #aridification

Click the link to read the article on the InkStain website (Eric Kuhn):

February 22, 2024

One of the commentors to our January 19th, 2024, blog post titled “Are We headed for the First Colorado River Compact Tripwire?” – John C. (who, by-the-way runs a very talented water resources engineering firm) raised several finer points to explore further:

The first point deals with obligations of each Basin to contribute water needed to meet U.S. obligations to Mexico under the 1944 Treaty. The second deals with the question of how to measure, and therefore manage, in the context of overall Colorado River Basin management, the use of tributary water in the Lower Basin. Both represent unresolved legal questions with enormous potential impacts on the allocation and distribution of the shrinking Colorado River – questions we have avoided dealing with by draining the Basin’s reservoirs. We no longer have that option.

The two issues have been disputed for decades. They are, of course, totally inter-related, and when one peels back the layers of each, the problems get so complicated that the only real solution may be for the Basin’s states and other stakeholders to ignore their past positions and grievances and negotiate a river management approach that works on the river we have today, even if that means changes to the foundation of the Law of the River, the 1922 Compact.

MEXICO OBLIGATION

The different interpretations of the Upper Basin’s delivery obligations to Mexico under Article III(c) are well understood throughout the Basin. III(c) says that water for Mexico should be provided from “surplus”. If there is no surplus, the Upper and Lower Basins much each provide half the necessary water. But there has never been agreement on what that language means in practice. This unresolved uncertainty has enormous implications for how much water is available to each basin in the future.

The Lower Division States take the position that there’s no current “surplus,” as defined by Article III (c), thus the Upper Division States must deliver at Lee Ferry 50% of however much water is required to be delivered under the Treaty. The annual delivery is normally 1.5 maf/year, but under either the “extraordinary drought” provision of the Treaty, or Minutes, it could be less. In 2023, it was 1.4 maf.

The Lower Division States’ position would dictate an average annual delivery of 8.25 maf/year at Lee Ferry, 7.5 maf under Article III(d) + 750,000 af under Article III(c). The 8.25 maf includes an average contribution of 20,000 af/year from the Paria River and would be adjusted for the occasional annual delivery of less than 1.5 maf. Veterans of the negotiations that led to the 2007 Interim Guidelines will recall that Arizona’s Herb Guenther always brought with him to the meetings a posterboard sign with “8.25” written on it.

Going back to the 1970 decision by the Secretary of the Interior to set the “minimum objective release” from Glen Canyon Dam at 8.23 maf/year, the Upper Division States have consistently taken the position that their annual obligation Mexico has never been formally defined and, whatever it is, it is not 750,000 af/year, every year. While they vigorously complained, they never chose to formally challenge the issue in court or in Congress, perhaps because they concluded that they couldn’t show that any of their interests were injured. Today, based on post-2000 hydrology, that dynamic may have fundamentally changed.

The basic position of each basin has not changed. If anything, because the stakes are much higher, the positions have hardened. In a December 20, 2022, scoping letter to Reclamation, Arizona’s Tom Buschatzke, and Ted Cooke, wrote: “Article III(d) and (c) prohibits the Upper Division States from depleting the flow of the river at Lee Ferry below a rolling 10-year aggregate of 75 maf plus one-half of the Mexico delivery obligation. With reduced releases from Glen Canyon Dam potentially analyzed under the SEIS, if the 10-year rolling aggregate falls below the required aggregate volume, the Upper Division States could be subject to a “Compact call” that would require a reduction in consumptive use in the Upper Basin.  In footnote 1, they add “A “surplus” currently does not exist because natural flows in the Colorado River have not exceeded 16 maf in the past 10 years.”  In their August 15, 2023, scoping letter, the three Lower Division States write: “The Post-2026 EIS must analyze whether alternatives are consistent with the 1922 Colorado River Compact non-depletion obligations and delivery obligations to Mexico. Alternatives should include actions necessary to ensure compliance with such obligations.”

Eugene Clyde LaRue measuring the flow in Nankoweap Creek, 1923. Photo credit: USGS

The Upper Division States are equally adamant that because of overuse in the Lower Basin, they currently have no annual obligation to Mexico under Article III(c). Note that I used the term “Lower Basin” because under the 1922 Compact, the Lower Basin includes the upper Gila River in New Mexico, where uses are small, Kanab Creek in Utah and Arizona, again uses are small, and the Virgin River, shared by Nevada, Arizona, and Utah, where uses are not small. The Virgin River is the water supply for the rapidly growing St. George area.  As a state, Utah consumes the second largest amount of Lower Basin tributary water, about 150,000 af/year, albeit much less than Arizona.

In recent public presentations, Colorado Commissioner Becky Mitchell has stated that the Lower Basin’s total annual use, including tributaries and reservoir evaporation, were 10.5 maf in 2020, 10.8 maf in 2021, and 10.4 maf in 2022, far more than the Lower Basin’s compact apportionment (7.5 maf under Article III(a) plus 1.0 maf under Article III(b)). Their position is that the Lower Basin’s overuse is “surplus” water that must first be used to meet the 1944 Treaty obligations to Mexico before the Upper Division States have any obligation to Mexico, a position the Lower Division States do not agree with.

The situation is messy. As I explain below, Mitchell’s 10-plus million acre foot calculation is based on analysis that contains a hidden assumption about the correct way to measure water use, an assumption at odds with the method the Upper Basin has traditionally used to measure its own water use. But when one peels back the layers, it’s even messier. First, there is no agreement on whether the obligation of the Upper Division States to Mexico is calculated on an annual basis, a ten-year rolling aggregate basis, or something else (I’m in the something else camp). The predominant position the Upper Division States is, as mentioned in John’s comments, that the since the 1944 treaty provides for an annual delivery to Mexico (which can change), therefore, the obligation of the Upper Division States is determined annually. As can be seen by the language in the Arizona and Lower Division States letter, the Lower Basin states’ position is based on a ten-year rolling aggregate. The logic of this position is that the last sentence of Article III(c) states: “whenever necessary the States of the Upper Division shall deliver at Lee Ferry water to supply one-half of the deficiency so recognized in addition to that provided in paragraph (d).”  Paragraph (d) is a ten-year requirement; does it make sense to add an annual requirement to a ten-year requirement? Further, the data necessary to determine whether a deficiency exists (and thus the obligation of each basin) would not be available until well after the water year is over.

My reading of the reports of the compact commissioners, their Congressional testimony, and the minutes of both the 1922 and 1948 suggests a third possible alternative.  The negotiators of the 1922 Compact, the 1944 Treaty, and the 1948 Compact considered the surplus to be the difference between the average long-term natural flow of the river at the international boundary and 16 million acre-feet, the aggregate of the apportionments made by Articles III(a) and III(b). During the negotiations of the 1948 Compact, Colorado’s Royce Tipton and Arizona’s Charles Carson laid out the logic. Based on the comprehensive hydrologic analysis conducted by Reclamation (Appendix I of the 1947 Comprehensive Report), the estimated long-term natural flow below the confluence of the Colorado and Gila Rivers was 17.7 maf/year. Subtracting 16 maf left an average surplus of 1.7 maf, 1.5 maf for Mexico and about 200 kaf for surplus uses within the United States. Upper Division State officials argued that with this hydrology there was no deficiency. Colorado’s Tipton and Clifford Stone (its 1948 Compact Commissioner), however, did acknowledge that the location of the surplus was an important factor.

With their 1940s understanding of the river hydrology, the Upper Division States did not want the deficiency calculated either on an annual basis or a ten-year running average. They understood that in both cases, they would be required to deliver more water to Mexico than using the long-term average. Under an annual determination, there would be many years (~50%) when there was a deficiency. Under the ten-year rolling average, there would be long periods when it would be below 16 maf/year and there would be a deficiency (the 1930s drought period for example) but provided the long-term average was more than 17.5 maf/year, there would be no deficiency. Tipton also made the point that in the future, the construction of additional storage reservoirs (like Lake Powell) would effectively “equate” the river. Today’s problem with this approach is that in the 1940s, the basin’s water managers assumed a level of “stationarity” (future river flows can be predicted by what happened in the past) that because of climate change does not exist today.

Resource: Stationarity is dead: Whither water management?

An additional problem we have today is the calculation of the deficiency is based on the natural flow at the international border with Mexico, not Lee Ferry. Note that the Arizona letter states, “natural flows in the Colorado River have not exceeded 16 maf/year.” That statement is very likely true, but there are no data to back it up. Unlike Lee Ferry, there are no recent calculations of annual natural flows at the international border. There is no Colorado River system natural flow database. The existing database includes natural flows to Lee’s Ferry, but downstream to the Imperial Diversion Dam, Reclamation acknowledges that they have little confidence in these data and much of it is not based on reconstructed natural flows.  Importantly, the existing natural flow database does not include the Gila River system.

The last widely published estimate of natural flows at the international border was completed by the Bureau of Reclamation nearly eighty years ago (Appendix I). These data were used during the 1944 Treaty ratification hearings and, to a lesser extent, by the 1948 Compact negotiators. Appendix I shows an average natural flow at the border of 17.72 maf/year. At Lee Ferry, it was 16.41 maf/year (based on1898-1943). Assuming a similar relationship between the flows today, from 2000-2023 the estimated natural flow at the border, including the Gila, would be approximately 13.5 maf/year (12.44/16.41 x 17.72). Note, because of climate change, which appears to have a greater impact on the southern tributaries of the Colorado River system, the relationship may no longer be reasonable.

Gila River watershed. Graphic credit: Wikimedia

Updating the natural flow database to include the Gila River has been suggested by Upper Division State officials, but Arizona has historically objected. Clearly this would not be an easy task and there would be large uncertainties, especially estimating with any certainty natural losses on the Colorado River below Hoover Dam and on the Gila River from the Phoenix area to Yuma under today’s climatic conditions.

LOWER BASIN TRIBUTARY USE

The Gila River is also the central subject of John C.’s second comment that Arizona, California, and Nevada should be concerned that including mainstem consumptive uses, tributary consumptive uses (including those in Utah and New Mexico), reservoir evaporation, and maybe system losses, the Lower Basin total consumptive uses exceed its compact apportionment of 8.5 maf/year. Alternatively, Lower Basin tributary consumptive uses far exceed 1.0 million acre-feet – if one believes Article III(b) was intended to only cover Lower Basin tributaries.  The problem with this argument is that there is no 1922 Compact definition of “beneficial consumptive use” (the “commodity” the Compact apportions). This is especially important for the Lower Basin tributaries.

There are different interpretations among the states and between the basins of how “beneficial consumptive use” should be defined and therefore measured. Each has a strong legal argument in its favor. But their approaches result in vastly different numbers, and as my co-author John Fleck has written, “There’s not enough water for all the lawyers to be right.”

Article VI of 1948 Compact defines and provides a method measuring compact apportionments for the Upper Basin. The 1964 decree in Arizona v. California defines how to measure the mainstem apportionments made to the Lower Division States under the 1928 Boulder Canyon Project Act. Since the 1963 decision did not interpret the 1922 Compact and there is no Lower Basin Sub-Compact, there is no accepted or defined method for measuring 1922 Compact apportionments on the Lower Basin tributaries (and arguably the entire Lower Basin).  The methods used by the 1948 Compact and the 1964 Decree are very different. The 1964 Decree uses the concept of “diversions minus return flows.” It comes from the language of the Boulder Canyon Project Act. Stream losses and reservoir evaporation from Hoover Dam to the points of diversion are not considered a use, but rather a limitation on the available supply.

September 21, 1923, 9:00 a.m. — Colorado River at Lees Ferry. From right bank on line with Klohr’s house and gage house. Old “Dugway” or inclined gage shows to left of gage house. Gage height 11.05′, discharge 27,000 cfs. Lens 16, time =1/25, camera supported. Photo by G.C. Stevens of the USGS. Source: 1921-1937 Surface Water Records File, Colorado R. @ Lees Ferry, Laguna Niguel Federal Records Center, Accession No. 57-78-0006, Box 2 of 2 , Location No. MB053635.

The 1948 Compact approach for defining and measuring consumptive use under Article VI is based on what was referred to as the “stream depletion” theory. Consumptive uses for the Upper Basin and for the individual states are measured as the net impact of man-made depletions on the natural (AKA virgin) flow of the Colorado River at Lee Ferry using the “input-output” method. The 1948 Compact gives the UCRC the authority to change the method by unanimous approval. The UCRC has instructed its staff to identify an alternative to the input-output method, so this may happen soon.  Article VI was one of the most debated and carefully written articles in the 1948 Compact. The negotiators had a clear objective in mind. They wanted to carefully define how to measure compact apportionments so that water made available for consumption through “salvage by use” would not count as compact apportioned use.

The issue of salvaged water was a major dispute among the basin states in the 1940s and 1950s. Simply put, salvaged water is water made available for use by the reduction of natural losses caused by the development of the river. The best example of salvage by use is Arizona’s Gila River. As the Gila River and its two major tributaries, the Salt and Verde Rivers, leave the rim country upstream of Phoenix, they have a combined average natural flow of over 2.0 maf/year (2.3 according to the 1947 report). As the river flows to its confluence at Yuma, in its natural state it loses about 1.0 maf/per year. By diverting and using the entirety of Gila River’s waters upstream, these losses are eliminated. Thus, Arizona can consume a million af/year more water than what the Gila River contributes to the natural flow of the Colorado River system.  Under the “stream depletion” theory, which was favored by Arizona and the Upper Division States, Arizona is only charged for a million acre-feet of 1922 Compact apportionment. Under California’s “diversions minus return flows” theory, also favored by Nevada, all 2+ maf/year of Arizona’s Gila River consumptive use would be charged as 1922 Compact apportionment.

The Upper Basin adopted the stream depletion theory during an era when the states were competing for every acre-foot possible. They thought could benefit by 400,000 -600,000 af per year. Simply put, in years when the water was physically available, the Upper Basin could consume 7.9 – 8.1 maf/year while only depleting the natural flow of the river at Lee Ferry by 7.5 maf/year (their compact apportionment). The negotiators never contemplated that 75 years later, the water available to the Upper Basin would be far less than 7.5 maf.

During the negotiations of the 1948 Upper Basin Compact, the decision to use the stream depletion theory was thoroughly debated. Wyoming’s legal advisor, W. J. Wehrli, warned the other states that using this definition would benefit the Lower Basin far more than the Upper Basin. Additionally, he noted that it could reduce the amount of surplus water under Article III(c), potentially increasing the obligation of the Upper Division States to Mexico. Wyoming ultimately fell in line and agreed to the Article VI definition. During the Congressional debate over the authorization of the Central Arizona Project, Upper Division State officials (primarily Tipton and Stone) testified in favor of the stream depletion theory, arguing that the negotiators of the 1922 Compact intended this method to measure apportionments. Note, the compact does not include a definition of “beneficial consumptive use,” they made their case based on an analysis of the minutes and the use of the term “depleted” in Article III(d).

The structural deficit refers to the consumption by Lower Basin states of more water than enters Lake Mead each year. The deficit, which includes losses from evaporation, is estimated at 1.2 million acre-feet a year. (Image: Central Arizona Project circa 2019)

The Upper Division States make a rhetorically powerful public argument that in the face of climate change, overuse in the Lower Basin is the central problem in the Colorado River Basin that must be solved to reach a sustainable future where water use, and the available supply are in balance. The argument is that when mainstem uses, reservoir evaporation, system conveyance losses, and tributary consumptive uses (in Arizona, Nevada, New Mexico, and Utah) are added together, the Lower Basin’s total use exceeds ten maf/year, perhaps as high as eleven maf/year. The Lower Basin’s compact apportionment, however, is only 8.5 maf/year (perhaps 7.5 maf/year depending on how Article III(b) is interpreted), resulting in an overuse of at least 1.5 maf/year. Such an overuse has major policy implications:

  • If the Lower Basin is overusing its compact entitlement, why should the Upper Basin, which is using far less than its apportionment, reduce its uses to help bring the system into balance?
  • Should the Lower Basin’s overuse be considered “surplus” water under Article III(c)? If so, should this surplus water be delivered to Mexico before the Upper Division States have any obligation to deliver half of the deficiency to Mexico?
  • These two questions have implications for Mexico, if the Lower Basin is overusing its compact apportionment, why should Mexico reduce its annual use?

The problem with the Upper Basin’s argument is that it’s based on the diversions less return flow theory. If the Lower Basin’s uses are calculated based on the stream depletion theory – the methodology the Upper Basin adopted in its own 1948 Upper Basin Compact, uses may not be greater than 8.5 maf/year.

Stream DepletionDiversions less Return Flows
Mainstem uses (a)6.6 maf/year6.6 maf/year
Reservoir Evaporation (b)0.5 maf/year0.86 maf/year
System Losses (c)00.45 maf/year
Tributary Uses (d)1.2 maf/year2.2 maf/year
Total8.3 maf/year10.1 maf/year

Explanation:

a) Mainstem uses (deliveries from Hoover Dam) are very similar under both theories. Almost all mainstem uses are either fully consumptive or located low in the system. The average mainstem use by the Lower Division States over the last five years (2019-2023) is approximately 6.6 maf/year.

b) Under diversions less return flows the 0.86 maf/year is the average evaporation (2017-2021) from the December 2023 Reclamation study. Under the stream depletion theory, reservoir evaporation is calculated as surface evaporation less the natural losses in the inundation area that would have occurred had the reservoir not been built. This is how evaporation on Lake Powell is calculated. I estimated natural losses as .36 maf/year.

c) The 0.45 maf/year is from the December 2023 Reclamation study. Under the stream depletion theory, system losses are offset by salvaged water. As a practical matter, we have no idea how much salvaged water is currently generated on the mainstem below Hoover Dam, but we do know that the channel is much smaller today than it was before development. In 1945 during the Mexican Treaty ratification hearings, Colorado’s Royce Tipton estimated the number to be 400,000 af/year. I’ll assume they offset.

d)Under diversion less return flows, tributary uses are 2.2 maf/year, the latest data from the 2001-2005 Consumptive Uses and Losses and Report. Under the stream depletion theory, it’s reduced by 1.0 maf/year, the estimated salvage on the Gila River from the 1947 study. Because of climate change, losses today may be greater, but no data are available.

Thus, using the diversions less return flows theory, the Lower Basin is clearly using more than 8.5 maf/year, but under Upper Basin’s own stream depletion theory, it is not. Since the 1922 Compact neither defines nor prescribes a way to measure “beneficial consumptive use,” the basic question – “is the Lower Basin overusing its compact apportionment?” simply cannot be answered. [ed. emphasis mine]

These disputes also point to the fundamental flaw with the states’ talking point that the 1922 Compact, the 1948 Upper Basin Compact, and the Mexican Treaty will serve as the foundation of the post-2026 operating rules. There is no agreement on what they say or mean. As the states continue their discussions with the goal of agreeing on a state proposal, they need to consider addressing the disputed compact issues in a straight-forward manner. Leaving these critical uncertainties for future generations to handle (like we have in the past) is no longer possible and asking the Supreme Court for a resolution will likely make matters worse, not better.

Map credit: AGU

‘A finite supply’: Ex-landowner sells 90 shares of Colorado-Big Thompson water at auction — The #FortCollins Coloradoan #ColoradoRiver #SouthPlatteRiver #COriver #aridification

Colorado-Big Thompson Project map. Courtesy of Northern Water.

Click the link to read the article on the Fort Collins Coloradoan website (Pat Ferrier). Here’s an excerpt:

February 14, 2024

Through the years, [Carol Oswald] Yoakum acquired 900 acres of farmland north of Longmont…A couple hundred acres went for a 20-home subdivision, 575 acres were put into a conservation easement with Boulder County so the views [of Long’s Peak] she lived with for 57 years would always be protected. She retained 175 acres…Now 91, Yoakum sold Meadow Green Farm in March 2023. On Wednesday, the last links to the property — 90 shares of Colorado-Big Thompson water — were auctioned at Boulder County Fairgrounds in Longmont. Fifteen buyers paid an average of $52,481 per share, or $4.72 million, making the water that once nourished the farm as valuable as the land itself.

The relatively rare water auction within Northern Water boundaries was the first of two this month that will ultimately see 186 shares of Colorado-Big Thompson water transition to new hands and new uses. On Wednesday, Yoakum’s 90 shares went to ditch companies, developers, farmers, ranchers and one municipality that will use it to add to their water holdings, supply water to new subdivisions and irrigate some farmland…Michael Markel of Markel Homes bought five shares at $49,500 each (including a 10% seller’s fee that goes to the auction house) to help provide water to homes in a 420-unit subdivision in Lafayette. “This will just cover a fraction” of the project, Markel said. Although the price per share opened at a high of $72,000, most shares sold for $46,000, plus seller’s fee. Water was sold in one to five units but could be combined for more shares. The largest share of water, 12 units, sold for $46,000 per share plus fees…Sterling Zehnder, who farms about 110 acres near Kersey, bought four shares at $53,000 each for irrigation.

On Feb. 28, the Carlson Family Trust will auction its 154-acre family farm in Eaton and 96 shares of Colorado-Big Thompson water. Markel said he may be among the bidders at that sale, too.

To buy Colorado-Big Thompson water, which is owned by the U.S. Bureau of Reclamation and jointly operated and managed by Northern Water, a buyer has to represent a municipality or already own some shares; the water has to be used within district boundaries; and it can’t be the sole source of water. “C-BT is intended to supplement” an existing water supply, said Jeff Stahla, spokesperson for Northern Water.

Long-term #ColoradoRiver rescue plan at an impasse? It’s north vs. south in the West — The Palm Springs Desert Sun #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Click the link to read the article on The Palm Springs Desert Sun website (Janet Wilson). Here’s an excerpt:

February 9, 2024

Will seven Western states be able to rapidly craft a voluntary plan to keep the Colorado River afloat for decades to come? It’s increasingly unclear, as negotiations have foundered between two sides, according to key players. There are sharp differences between northern and southern states’ proposals, with representatives of the mountainous Upper Basin states of Colorado and New Mexico unwilling, to date, to shoulder large future cuts, both because of historic underuse of their share of the river and because of heavily populated California and Arizona’s historic overuse. The southwestern states have for years taken twice as much as their northern neighbors.

Total losses (evaporation and riparian ET) from Reach 1 through Reach 5. Credit: USBR

Upper Basin officials, including Colorado’s plainspoken river commissioner, Becky Mitchell, said they have been informed of a proposal under discussion by California, Arizona and Nevada, collectively known as the Lower Basin, where the Lower Basin and Mexico would agree to take 1.5 million acre-feet of water less from the shrinking river each year. Mitchell said far more details are needed. That amount would be enough to both to make up for evaporation and leakage from delivery canals snaking across the hot desert, and to help stabilize the nation’s largest reservoirs, based on a report released Thursday by the U.S. Bureau of Reclamation that showed average annual losses to evaporation and river banks of 1.3 million acre-feet in the Lower Basin.

Lower Basin officials, including California’s Colorado River commissioner JB Hamby, who is leading the state’s negotiating team, declined to confirm numbers while they hash out specifics, but pointedly said major reductions need to be contributed by every state. One California official did confirm the numbers. Tom Buschatzke, Arizona’s top representative on the river talks, also wouldn’t confirm the 1.5 million acre-feet number, but emphasized the structural magnitude of what the Lower Basin is offering to do, noting his state and California, with help from Nevada and Mexico, would address evaporation and leakage for decades to come, and contribute more atop that to help stabilize the system. But, he said, more needs to be done, by everyone.

“It’s hugely important for folks to know that the Lower Basin is going to step up, and that we see a desire and a need for the rest of the problem to be solved collectively,” he said. “We can’t do it all. It is not physically possible.”

[…]

For now, negotiations between the two sides have ground to a halt, even as a deadline looms to produce a draft agreement by next month. The last time representatives from all seven states met face to face was in early January, when they convened at the Woolley’s Classic Suites, at Denver Airport. Since then, at the urging of U.S. Reclamation Commissioner Camille Calimlim Touton, there have been two Zoom calls with all the states that highlighted the fundamental differences, one participant said. The northern states recently invited their southern counterparts to Salt Lake City to resume full talks, but none chose to attend.

“We’ll keep inviting them,” Mitchell said. “I do not think we are at an impasse, and I do not believe we need to be at an impasse.”

Map credit: AGU

Navajo Dam operations update February 10, 2024: Bumping releases to 400 cfs to the #SanJuanRiver #aridification

San Juan River Basin. Graphic credit Wikipedia.

From email from Reclamation (Susan Novak Behery):

In response to falling flows in the critical habitat reach, the Bureau of Reclamation has scheduled an increase in the release from Navajo Dam from 350 cubic feet per second (cfs) to 400 cfs for tomorrow, February 10th, at 4:00 AM.

Releases are made for the authorized purposes of the Navajo Unit, and to attempt to maintain a target base flow through the endangered fish critical habitat reach of the San Juan River (Farmington to Lake Powell).  The San Juan River Basin Recovery Implementation Program recommends a target base flow of between 500 cfs and 1,000 cfs through the critical habitat area.  The target base flow is calculated as the weekly average of gaged flows throughout the critical habitat area from Farmington to Lake Powell. 

Reclamation publishes overview of #ColoradoRiver evaporation history #COriver #aridification

Map of reaches identified in the Lower Colorado River Mainstream Evaporation and Riparian Evapotranspiration Losses Report. Credit: USBR

Click the link to read the release on the Bureau of Reclamation website (Michelle Helms):

February 8, 2024

The Bureau of Reclamation today published an overview of historical natural losses along the lower Colorado River. The Mainstream Evaporation and Riparian Evapotranspiration report looks at water surface evaporation, soil moisture evaporation, and plant transpiration. It will be used by Reclamation as a source of data as it manages regional water operations and to improve the agency’s modeling efforts.   

 “Reclamation’s approach to water management in the Colorado River Basin and across all Reclamation states is based on best available science, transparency, and inclusivity.” said Reclamation Commissioner Camille Calimlim Touton. “The release of the Mainstream Evaporation and Riparian Evapotranspiration study today evidences this commitment by informing our partners and the public about river and reservoir evaporation and transpiration in the Colorado River Basin.”   

 The report provides an overview of average mainstream losses from both river and reservoir evaporation, as well as the evaporation and transpiration associated with vegetation and habitats along the river. The report states that approximately 1.3-million-acre feet of losses occur annually along the lower Colorado River mainstream. Based on data from 2017 to 2021, approximately 860,000 acre-feet of Colorado River water is lost to evaporation occurring annually from Lake Mead to the border with Mexico. A further 445,000 acre-feet is lost to evaporation and transpiration from natural vegetation and habitats.   

Reclamation is committed to addressing the challenges of climate change and drought in the Colorado River Basin, using science-based, innovative strategies. As Reclamation continues working cooperatively with the basin states, tribes, stakeholders, partners, and the public who rely on the Colorado River, we are also deploying historic funding and resources from President Biden’s Investing in America agenda that increase near-term water conservation, build long term system efficiency, and prevent the Colorado River System’s reservoirs from falling to critically low elevations that would threaten water deliveries and power production. As a result of the commitment to record volumes of conservation in the Basin, as well as recent hydrology, the Interior Department announced in October 2023 that the chance of falling below critical elevations has been reduced to eight percent at Lake Powell and four percent at Lake Mead through 2026. Lake Mead is currently about 40 feet higher than it was projected to be at this time last year. 

 The Mainstream Evaporation and Riparian Evapotranspiration report is available on the Reclamation website. 

Total losses (evaporation and riparian ET) from Reach 1 through Reach 5. Credit: USBR

A freight train of thoughts about the #ColoradoRiver: Becky Mitchell, Colorado’s chief negotiator on the Colorado River, demands the lower-basin states take meaningful action on correcting the ‘structural deficit’ — Allen Best (@BigPivots) #cwcac2024 #COriver #aridification

Becky Mitchell. Photo credit: Allen Best/Big Pivots

Click the link to read the article on the Big Pivots website (Allen Best):

February 2, 2024

Becky Mitchell speaks crisply and with a bass-drum firmness. Her speeches are like freight trains, orderly processions full of weight, one thought pounding after another.

Her full-time job since July 2023, as Colorado’s lead negotiator in Colorado River matters, gives her weighty material that matches her rhetorical style. Before that, she informally held the same role as the director of the Colorado Water Conservation Board.

The Colorado River has been riven with rising drama in the last 20 years. The seven basin states – but particularly Arizona and California – have reluctantly, slowly conceded reforms necessary to the occasion. The federal government, the referee for the river and operator of the two giant dams, Hoover and Glen Canyon, was slow to force the hard decisions.

“It is time for a fundamental change in how we manage the Colorado River,” she told members of the Colorado Water Congress at the group’s annual conference on Jan. 30. “It’s time to adapt to the river that we have, not the river we dream of.”

“We have some difficult roads ahead of us as we work to find a sustainable solution for the basin,” she said in wrapping up her 15-minute speech. “What we must do would’ve been easier 10 years ago. It would’ve been easier 5 years ago. Tomorrow will be difficult, but we must have the courage to try.”

Following is a lightly abridged version of the speech:

Change is coming. I can’t emphasize enough how much the post-2026 negotiations matter whether you are in the upper basin, lower basin, Mexico, or a member of one of the 30 tribal nations. We all deserve a future with certainty and security in our water supply without that being jeopardized by constant crisis management. We also all deserve a future where we can live within the means of the river and without the risk of overuse or misuse driving us into crisis.

The Yampa River carried a robust runoff flow from winter snows through Steamboat Springs in May 2023, helping pull back the two giant reservoirs of the Colorado River from the brink of disaster. Top, Becky Mitchell addresses the Colorado River Water Users Association in December 2021. Photos/Allen Best

For the past two decades, the upper basin has been caught between the impacts of climate change and lower-basin overuse. I acknowledge that the lower basin does not like the term overuse. My intent is not to offend, but rather to be clear and honest about uses that exceed what the compact and hydrology can allow whatever it is called. We cannot and will not agree to guidelines that perpetuate management of our water resources that do not acknowledge what Mother Nature is providing. The basin cannot continue to use water at a rate that is unsustainable. Those who are fearful of change or who benefit from status quo will find fault in the plain facts that I share with you here today. You will find fault in the tone with which I share them.

The good news is that change is coming. The upper division states have said for years, decades now, the lower basin needs to take responsibility for the role in emptying the reservoirs. But let me be clear why this change is needed. Dry hydrology and overuse have drained the reservoirs. Future guidelines must recognize the reality of the Colorado River Basin hydrology.

Our lower basin neighbors have recently recognized that they must address the overuse. The next step for them is to explain how will they make this commitment a reality. We look forward to seeing those details.

We will continue to do everything we can to get to a seven state solution that protects Colorado and the upper basin, but we also need to be prepared for other scenarios. The upper division states have presented a concept to the lower basin states that outlines mechanisms for living within the means of the river while rebuilding and maintaining Powell and Mead and operating within the law of the river.

(Our concept) is essentially a water budget that honors the law and Mother Nature. The Colorado River Compact is our foundation. Solutions need to respect the law of the river and recognize the reality of hydrology across the entire basin. Those solutions must also be real and verifiable. Aspirational goals do not provide the clarity that is required to provide predictability across the basin.

We cannot and will not agree to balancing like the ’07 guidelines, a concept that was used to justify sending water downstream. The water should be used to rebuild storage. We’re focused on fair, legal and sustainable outcomes for the entire basin. Out of respect for the sovereignty of those lower basin states and the role of the Secretary of the Interior as the water master in the lower basin states, we have not weighed in on how they should apportion the reductions amongst themselves. That is for the lower basin (states) to work out.

We have heard our downstream neighbors say, if we figure out the structural deficit, will you meet us in the middle on climate change? That’s one heck of a hypothetical. If the lower basin overuse is addressed, we’d be looking at a very different situation than what we see today. In fact, if the lower basin had accounted for evaporation and transit losses through the ’07 guidelines, the reservoirs would likely be healthy now.

We are the ones who’ve been doing the work on climate change. We absolutely have been doing our part. What I’ve heard from across Colorado is we are willing to help. We are willing to be a part of the solution, but we cannot solve a problem alone.

We (already) take involuntary and uncompensated reductions when Mother Nature doesn’t provide water. Users in the upper basin have taken an average of 1.3 million acre-feet in shortages annually over the last several years. We make do with less in our communities, our workforce, our economies, and our food production. The lower basin must recognize and acknowledge the annual shortages that occur in the upper division states and then acknowledge — thank you — that the operation of the reservoirs must absolutely respond to hydrology. In addition, we must also acknowledge that the upper basin has not developed into our 7.5 million acre-foot apportionment and that undeveloped tribal water rights are flowing downstream.

In May 2022, this boat ramp at Lake Powell was useful as a place to sit but had no value for launching boats. Photo/Allen Best

Overuse must end, and the compact must remain our foundation. It will not be easy. As we move into a future that is more responsive to hydrology, I acknowledge that we all must acknowledge there will be hardship and pain, while also acknowledging that this hardship and pain has existed in the upper basin for decades. Because we haven’t been shielded from climate change impacts, the upper basin states are uniquely positioned to assist our downstream neighbors in learning how to live with less.

We are collaborating in unprecedented ways in the upper basin, and this time we’re doing it at a bigger table. I’m very proud that we are working with the upper basin tribal nations in recognition of their historical ownership and their undeveloped federally reserved water rights. This collaboration has made very clear to me that is unacceptable for the upper division states to accept any limitations on future uses when upper basin tribes have limited access to clean water, agricultural production, and economic vitality.

I remember the speech I gave in the summer of 2022. The reservoirs were crashing. The federal government had laid out an ultimatum: Figure out how to conserve 2 to 4 million acre feet or we’ll figure it out for you. The lower basin was unwilling and unable to reach an agreement about cuts to their uses. I remember many long meetings and long hours that my team and I put into discussions with our fellow upper division states. We worked out the five-point plan. This was a turning point for Colorado. The decision was a difficult one for me. It was not fun.

By implementing this plan, we have positioned ourselves as leaders in the basin, the ones willing to come to the table to do our part. Colorado cannot and will not accept status quo. We cannot or will not be bullied into a future that drains the reservoirs for continued unsustainable use.

For example, we pushed the Bureau of Reclamation to modify how the upper basin is represented in Colorado River Basin modeling. Our advocacy means that today the updated models better reflect the reality in the upper basin, a reality that will be represented in the post 2026 tools. Reclamation models now show what shortages look like here.

This team has also worked to make Colorado more resilient. Over the past year, the CWCB has spearheaded a turf removal program to make our municipalities more resilient for future water shortages.

Division of water resources has continued to strictly administer water rights, including painful cuts to water use to respond to Mother Nature.

My fellow commissioners and the upper Colorado River Commissioners revamped the 2024 System Conservation Pilot Program, or SCPP, to allow water users to voluntarily forego their water uses in exchange for compensation, thereby helping to put water in the river to mitigate drought in the upper division states.

California’s Imperial Valley has a year-round growing season and uses Colorado River water for palm trees and almost every crop imaginable . February 2017 photo/Allen Best

The drought task force critically examined the Colorado River issues and not only applauded the good work of the state, but recommended additional resources to augment our existing work.

The river team is also working to transition our guiding principles from paper to practice. You are all familiar with the irrefutable truths. It’s one thing to say these are our principles. It’s another thing to then apply them to the basin-states negotiations. That is a difficult task. I’ve seen some of these principles gain traction throughout the entire Colorado River basin. Federal government has acknowledged the need for managing the reservoirs sustainably. The lower basin has acknowledged the need to address their overuse. The environmental community recognizes that healthy storage at our nation’s two largest reservoirs must be the first step in protecting Colorado’s rive and the, Colorado River’s ecosystems. Gradually, I’m hearing interest from DC to the Imperial Valley, recognizing that the status quo does not work anymore.

It is time for a fundamental change in how we manage the Colorado River. We must all live within the means of the river if we hope to sustain it. I want Lake Powell and Lake Mead to serve the purposes they were designed to serve. To provide for sustainable development of our compact apportionments in the Colorado River Basin and to provide water security in dry years. A sustainable system means we have to rebuild storage in Lake Powell and Lake Mead and protect upstream storage for releases only in the most dire circumstances. This means that the worldview around water must change, particularly in the lower basin. We must manage demand to rebuild the storage that provides certainty of supply. In all years, we all must adapt to the available water supply.

We have an opportunity now to collaboratively determine how to adapt to the river that we have, not the river we dream of. The lower basin states have said many good things that signal that they are open to collaboration.

We believe them when they say they will own the structural deficit, when they say they will live within the means of the river, when they say they will support the tribes and that they support the environment. I take them at their word. We assume that they are serious about these commitments, and we expect open and transparent accounting of all lower basin uses of main stem tributaries so that we can trust but verify their actions. We hope that the lower basin will come around to support the framework for management of Lake Powell and Lake Mead that is sustainable for the 40 million people who rely on the Colorado River.

What we must do would’ve been easier 10 years ago. It would’ve been easier five years ago. Tomorrow will be difficult, but we must have the courage to try.

Colorado River Basin Plumbing. Credit: Lester Doré/Mary Moran via Dustin Mulvaney and Twitter

A Future With Certainty: #ColoradoRiver Commissioner Rebecca Mitchell Speaks on Tough Road Ahead for Post-2026 Negotiations — #Colorado Department of Natural Resources #cwcac2024 #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

From email from the Colorado Department of Natural Resources (Michael Elizabeth Sakas):

February 1, 2024

Rebecca Mitchell, Colorado’s Upper Colorado River Commissioner, spoke to a sold-out crowd at the Colorado Water Congress’s Annual Convention in Aurora, CO this week. She shared an update on the state’s negotiation positioning, and the reality of difficult roads ahead, as the states and Tribal Nations work to find sustainable solutions for 40 million people who rely on the Colorado River in the arid southwest.

“Change is coming to the Colorado River and because it is, I can’t emphasize enough how much the Post-2026 negotiations matter,” Commissioner Mitchell said in her speech. “Whether you are in the Upper Basin, Lower Basin, Mexico, or a member of one of the 30 Tribal Nations, we all deserve a future with certainty and security in our water supply, without that being jeopardized by constant crisis management.”

The current guidelines, called the ‘07 Guidelines, manage Lake Powell and Lake Mead. These expire in 2026, and the states that share the river are in the process of negotiating new guidelines for how Lake Powell and Lake Mead will operate post-2026. Powell and Mead hit their lowest levels on record in recent years, partly because states in the Lower Basin continue to use more water than what flows into these reservoirs. Commissioner Mitchell said that the ‘07 Guidelines cannot simply be extended.

“I want to recognize that the Lower Basin does not like the term overuse. My intent is not to offend, but rather to be clear and honest about uses that exceed what the Compact and hydrology can allow,” Commissioner Mitchell said. “Whatever you call it, we cannot– and will not– agree to guidelines that perpetuate management of our water resources that do not acknowledge what Mother Nature is providing. The Basin cannot continue to use water at a rate that is unsustainable.”

“History shows that collaborative efforts by the Basin States can provide superior solutions. We will continue to do everything we can to get to a seven-state solution that protects Colorado and the Upper Basin. But we also need to be prepared for other scenarios,” Commissioner Mitchell said.

“Our Colorado River team is a force. I cannot thank the Colorado Water Conservation Board, the Division of Water Resources, and the Attorney General’s teams enough. Also, I greatly appreciate the support of  Governor Polis, who has been engaged and helpful as we enter these critical negotiations,” Commissioner Mitchell said. “Together, we have shown the federal government and the Lower Basin that Colorado cannot and will not accept the status quo or be bullied into a future that drains the reservoirs for continued, unsustainable use in the Lower Basin.”

Map credit: AGU

Click the link to read Commissioner Mitchell’s full speech from the 2024 Colorado Water Congress Annual Convention on the Colorado Department of Natural Resources website:

Rebecca Mitchell, Colorado’s Upper Colorado River Commissioner 
Colorado Water Congress Annual Convention Speech
Jan. 31, 2024

Change is coming – and because it is, I can’t emphasize enough how much the Post-2026 negotiations matter.

Whether you are in the Upper Basin, Lower Basin, Mexico, or a member of one of the 30 Tribal Nations, we all deserve a future with certainty and security in our water supply without that being jeopardized by constant crisis management. We all deserve a future where we can live within the means of the river, without the risk of overuse or misuse driving us into crisis.

For the past two decades, the Upper Basin has been caught between the impacts of climate change and Lower Basin overuse, along with the increasing risk that our thirsty neighbors will look upstream for more water.

The structural deficit refers to the consumption by Lower Basin states of more water than enters Lake Mead each year. The deficit, which includes losses from evaporation, is estimated at 1.2 million acre-feet a year. (Image: Central Arizona Project circa 2019)

I want to recognize that the Lower Basin does not like the term overuse. My intent is not to offend, but rather to be clear and honest about uses that exceed what the Compact and hydrology can allow. Whatever you call it, we cannot – and will not – agree to guidelines that perpetuate management of our water resources that do not acknowledge what Mother Nature can provide.

The Basin cannot continue to use water at a rate that is unsustainable.

Those who are fearful of change, or who benefit from the status quo, will find fault with the plain facts I share here with you and will find fault with the tone in which I share them, as an excuse for their inaction. We must move forward together to face the future with honesty and courage. You, Colorado, and all people in the Basin deserve nothing less than honesty and courage.

The good news? Change is coming. The Upper Division States have said for decades that the Lower Basin needs to take responsibility for its role in emptying the reservoirs.

Let’s be clear about why this change is needed. The ‘07 Guidelines cannot be extended. Under the ‘07 Guidelines, dry hydrology and overuse by the Lower Basin have drained the reservoirs. Future guidelines must recognize the reality of Colorado River Basin hydrology.

Our Lower Basin neighbors recognize that they must address their overuse, what they call the “structural deficit.” I applaud that first step of acknowledging their responsibility. The next step is for them to explain how they will make this commitment a reality that we can rely on. We look forward to seeing those details.

The history of the Basin shows that collaborative efforts by the Basin States can provide superior solutions. We will continue to do everything we can to get to a seven-state solution that protects Colorado and the Upper Basin.

But we also need to be prepared for other scenarios.

The Upper Division States have presented a concept to the Lower Basin States that outlines mechanisms for living within the means of the river while rebuilding and maintaining Powell and Mead, and operating within the Law of the River – essentially a water budget that honors the law and Mother Nature.

The Colorado River Compact is our foundation. Solutions need to respect the Law of the River and recognize the reality of the hydrology of the Colorado River Basin. Solutions must also be real and verifiable. Aspirational goals do not provide the clarity that is required to provide predictability to the Basin.

We cannot and will not agree to continue  “balancing” under the ‘07 Guidelines, a concept used to justify sending water downstream to fuel Lower Basin overuse. That water should be used to rebuild storage.

We’re focused on fair, legal, and sustainable outcomes for the entire Basin.

Out of respect for the sovereignty of the Lower Basin States, and the role of the Secretary of the Interior as Water Master of the Lower Basin, we have not weighed in on how they should apportion reductions among themselves. That is for the Lower Basin to work out. We’ve rolled up our sleeves in a good-faith effort to balance the demands with supplies, and the need to have water available in dry years to keep the system from crashing.

We have heard our downstream neighbors say, “If we figure out the structural deficit, will you meet us in the middle on climate change?”

First off – that’s one heck of a hypothetical. If Lower Basin overuse is addressed, we would be looking at a very different situation than what we see today. In fact, if the Lower Basin had accounted for evaporation and transit losses throughout the ‘07 Guidelines, the reservoirs would likely be healthy.

But at this time, we’re the only ones who’ve been doing anything about climate change. We’ve shown that we are willing to do our part, that we have been doing our part. I have heard across Colorado that we’re willing to help – but we cannot solve the problem alone.

We take involuntary and uncompensated reductions when Mother Nature does not provide. Water users in the Upper Basin have taken an average of 1.3 million acre-feet in shortages annually over the last several years. In other words, we have used 1.3 million acre-feet less than what we may have used if our water users’ demands were fulfilled.
 
When we make do with less water, we also make do with less in our communities, our workforce, our economies, and our food production. The Lower Basin must recognize and acknowledge the annual shortages that occur in the Upper Division States, and then acknowledge that the operation of reservoirs must respond to hydrology.

In addition, we must acknowledge that the Upper Basin has not developed into our 7.5 million acre-foot apportionment and that undeveloped Tribal water rights are flowing downstream.

Regardless of what the future agreement looks like, the sideboards are set: we can no longer operate without regard for Mother Nature, overuse must end, and the Compact must remain our foundation.

It won’t be easy. As we move to a future that is more responsive to hydrology, I acknowledge that there will be hardship and pain in the Lower Basin – while also acknowledging that this hardship and pain has existed in the Upper Basin for decades, because we haven’t been shielded from climate change impacts.

The Upper Basin is uniquely positioned to assist our downstream neighbors in learning to live with less.

Seventy-five years ago, my predecessor agreed to the 1948 Upper Colorado River Compact, which established the Upper Colorado River Commission (UCRC) as a forum for “interstate comity.” That sentiment has never been truer in the Upper Basin than today. The Upper Division States are strongly united, and we’re stronger because of the common interests shared across Colorado, New Mexico, Utah, and Wyoming.

Native America in the Colorado River Basin. Credit: USBR

We are collaborating in unprecedented ways in the Upper Basin, and this time we’re doing it at a bigger table. I’m very proud that we are working with the Upper Basin Tribal Nations in recognition of their historical ownership and their undeveloped federally reserved water rights. This collaboration has made it very clear to me that it is unacceptable for the Upper Division States to accept any limitations on future uses when the Upper Basin Tribes have limited access to clean water, agricultural production, and economic vitality.

What we can do and what we will do is operate responsibly, and initiate programs and policies that promote sustainable uses across the Upper Basin.

I would like to take a moment to reflect on how far we have come as a state, and as the Upper Basin, over the last couple of years. I remember the speech I gave to you all in the summer of 2022. The reservoirs were crashing. The federal government had laid out an ultimatum: “Figure out how to conserve 2 to 4 million acre-feet, or we’ll figure it out for you.” The Lower Basin was unwilling and unable to reach an agreement about cuts to their uses.

When it became clear that a Basin agreement was impossible, I remember the many long meetings and long hours that my team and I put into discussions with our fellow Upper Division States. And we worked our way to the Five Point Plan.

That Five Point Plan was a turning point for Colorado. You all know that decision was a difficult one for me. But by implementing this plan, we positioned ourselves as leaders in the Basin as the ones willing to come to the table to do our part.

A few short months later, the General Assembly passed a bill that funded the creation of several new full-time employees. If you’ve ever worked in state government, you’ll know that getting one new employee is a massive success – imagine then how significant it is to secure nearly 20 positions dedicated to Colorado River issues.

Our Colorado River team is a force. I cannot thank the Colorado Water Conservation Board, the Division of Water Resources, and the Attorney General’s teams enough. Together, we have shown the federal government and the Lower Basin that Colorado cannot and will not accept the status quo or be bullied into a future that drains the reservoirs for continued, unsustainable use in the Lower Basin.

For example, we pushed the Bureau of Reclamation to modify how the Upper Basin is represented in Colorado River Basin modeling. Our advocacy means that today, the updated models better reflect the reality in the Upper Basin — a reality that will be represented in post-2026 tools. Reclamation models now show what shortages look like here. The models also show how shortage cuts into our water needs.

This team has also worked to make Colorado more resilient. Over the past year, the CWCB has spearheaded a turf removal program to make our municipalities more resilient to future water shortages; DWR strictly administered water rights – including painful cuts to water use – to respond to Mother Nature; Me and my fellow Upper Colorado River Commissioners revamped the 2024 System Conservation Pilot Program – or SCPP – to allow water users to voluntarily forgo their water uses in exchange for compensation, thereby helping to put water in the river to mitigate drought in the Upper Division States; and the Drought Task Force critically examined Colorado River issues, and not only applauded the good work of the state, but recommended additional resources to augment our existing work.

The Colorado River team is also working to transition our guiding principles from paper to practice. You are all familiar with the irrefutable truths. It’s one thing to say, “These are our principles.” It’s another thing to then apply them in Basin State negotiations.

I’ve seen some of the principles gain traction throughout the entire Colorado River Basin.  The federal government has acknowledged the need for managing the reservoirs sustainably. The Lower Basin has acknowledged the need to address their overuse. The environmental community recognizes that healthy storage at our nation’s two largest reservoirs must be the first step in protecting the Colorado River’s ecosystems.

Gradually, I’m hearing diverse interests, from D.C. to the Imperial Valley, recognize that the status quo doesn’t work anymore, that it is time for a fundamental change in how we manage the Colorado River, and that we must all live within the means of the River if we hope to sustain it.

I want Lake Powell and Lake Mead to serve the purposes they were designed to serve: to provide for sustainable development of our compact apportionments in the Colorado River Basin, and to provide water security in dry years.

A sustainable system means we have to rebuild storage in Lake Powell and Lake Mead, and protect upstream storage for releases only in the most dire circumstances. This means that the worldview around water must change – particularly in the Lower Basin. We must manage demand to rebuild the storage that provides certainty of supply in all years. We all must adapt to the available water supply.

We hope our Lower Basin partners will meet us in this moment. We have an opportunity to collaboratively determine how to adapt to the river that we have, not the river that we dream of.

The Lower Basin states have said some good things that signal they are open to collaboration. We believe them when they say that they will “own the structural deficit,” when they say they will “live within the means of the River,” that they “support the Tribes,” and that they “support the environment.”

I take them at their word. We assume they are serious about these commitments, and we expect open and transparent accounting of all Lower Basin uses– mainstem and tributaries– so that we can trust but verify their actions.

We hope that the Lower Basin will come around to support a sustainable framework for the management of Lake Powell and Lake Mead for the 40 million people who rely on the Colorado River. We are bound together by this River, by the Compact we signed 100 years ago, and by our shared interest in a vibrant American southwest.

Utilizing unprecedented federal funds, I believe that we can reach an agreement that protects all who rely on this critical resource – and we should do this post haste: 40 million people are counting on us.

I want to acknowledge my counterparts in both the Upper and Lower Basins, along with the leadership of the Bureau of Reclamation, and the fact that we have some difficult roads ahead of us as we work to find a sustainable solution for the Basin.  What we must do would have been easier ten years or even five years ago. Tomorrow will be difficult, but we must have the courage to try.

The history of the Basin shows that collaborative efforts by the Basin States can provide superior solutions. We all know we must prepare for other scenarios. But for now, I promise you that we are focused on finding that collaborative solution.

My request is that Colorado stay unified at this critical time in the negotiations. I commit to making space and time to have the difficult discussions we need to have within Colorado about these important issues. But the most important task – right now – is to find success in the negotiations with the other Basin States.

Success depends on all of us staying together with a common goal of protecting the resources of Colorado for all who depend upon them – including the Tribal Nations, agricultural users, cities, and the environment.

Thank you.

Colorado River “Beginnings”. Photo: Brent Gardner-Smith/Aspen Journalism

Aspinall Unit Forecast for Operations January 30, 2024 #GunnisonRiver #ColoradoRiver #COriver #aridification

From email from Reclamation (Erik Knight):

Click the link to view the forecast graphics.

Are We Headed for the First #ColoradoRiver Compact Tripwire? — Eric Kuhn and John Fleck (InkStain.net) #COriver #aridification #CRWUA2023

Colorado River “Beginnings”. Photo: Brent Gardner-Smith/Aspen Journalism

Click the link to read the article on the Inkstain website (John Fleck):

The Bureau of Reclamation’s January 2024 “Most Probable” 24-month study forecasts that annual releases from Glen Canyon Dam for both Water Years 2025 and 2026 will be 7.48 million acre-feet per year (maf). If this happens, the ten-year total flow at Lee Ferry for the 2017-2026 period will drop to about 83.0 maf, only about 500,000 acre-feet above 82.5 million acre-feet, the first 1922 Compact hydrology “tripwire.”

That line – 82.5 maf feet of Lee Ferry deliveries over a ten year period – has become a dividing line between two contending interpretations of the most important unresolved question in the century-old Colorado River Compact: How much water must the Upper Basin deliver to the Lower Basin? What happens if it doesn’t?

September 21, 1923, 9:00 a.m. — Colorado River at Lees Ferry. From right bank on line with Klohr’s house and gage house. Old “Dugway” or inclined gage shows to left of gage house. Gage height 11.05′, discharge 27,000 cfs. Lens 16, time =1/25, camera supported. Photo by G.C. Stevens of the USGS. Source: 1921-1937 Surface Water Records File, Colorado R. @ Lees Ferry, Laguna Niguel Federal Records Center, Accession No. 57-78-0006, Box 2 of 2 , Location No. MB053635.

The consequences of triggering the tripwire, which might happen in 2027, are significant. In the worst case scenario, it could plunge the basin into Supreme Court litigation over the interpretation of the 1922 Compact, which could result in a forced curtailment of post-compact water uses in the Upper Basin. Or, alternately, if the Basin States are willing to settle their long-term disputed issues or implement basic changes to the Law of the River via the renegotiations of the post-2026 operating rules, it could be a “non-event.”  This is one of the fundamental issues facing the states as they meet to develop their basin-state alternative.

The 82.5 maf tripwire is based on the 1922 Compact’s two flow-related requirements at Lee Ferry; Article III(d) requires the four Upper Division States to not cause the progressive ten-year flow at Lee Ferry to be depleted be depleted below 75 maf. Additionally, Article III(c) provides that if there is not sufficient surplus water to meet the annual water delivery requirements of the 1944 Mexican Treaty, normally 1.5 maf, then each basin must provide half of the deficiency (the required annual delivery minus the available surplus). The Upper Division States must deliver their share of the deficiency at Lee Ferry in addition to their obligations under Article III(d).

The Upper Division and Lower Division States have never agreed on the meaning and interpretation of Article III(c). There have been numerous papers on the disputed issues by both compact scholars and practitioners and Article III(c) has never been interpreted by the U.S. Supreme Court. Suffice it to say that the Lower Division States believe that the Upper Division States must deliver at Lee Ferry a total of 82.5 maf every ten years (75 maf + 10 x 750,000), but the Upper Division States believe that they currently have no obligation to Mexico, so the number is at most 75 million. There are of course, nuances. The Lower Division States have suggested that the Upper Division States might also need to cover transit losses between Lee Ferry and Mexico and the Upper Division States have most recently suggested that if climate change, not Upper Basin depletions, is causing the ten-year flow to fall below 75 million, then their article III(d) non-depletion obligation must be appropriately adjusted. Further, if pursuant to either the extraordinary drought provision or a treaty minute, the required annual delivery to Mexico is less than 1.5 maf, then, even with no surplus, the Upper Division’s 50% share would be less than 750,000 acre-feet.

Paria River near Buckskin Gulch. By Seth G. Cowdery – Transferred from English Wikipedia. Original location was here., CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=835575

One should recognize that the annual releases from the Glen Canyon Dam and the annual flow at Lee Ferry (the compact point) are not the same.  Between the dam and Lee Ferry, the river gains flow from groundwater accretions (in part due to leakage around the dam) and from the Paria River. These gains can vary from about 30,000 acre-feet to over 300,000 acre-feet annually.  The ten-year Lee Ferry flow for 2014-2023 was approximately 86.1 maf.

That amount – 86.1 maf – might seem like a safe cushion. But because it is a ten-year moving total, we are about to drop out years with big releases (9 million acre feet) and replace them with years with just 7.48 maf. At the end of 2024, because both 2014 (the year that drops out) and 2024 (the year that is added in) are 7.48 maf years, the ten-year flow will stay about the same.  The way the ten-year flow calculation works is next year, 2015 will drop out and 2025 will be added in, and so on, but here is the problem; From 2015 through 2019, the 2007 Interim Guidelines dictated an annual release of 9 maf per year. With accretions, flows at Lee Ferry averaged about 9.18 maf per year (source: UCRC 74th Annual Report). Thus, if 2025 and 2026 are 7.48 maf years, the ten-year flow will lose about 1.5 maf/year making the total about 83 maf for the 2017-2026 period. Because the 2007 Interim Guidelines expire, we don’t know what the annual release will be in 2027, but if it’s less than about 8.5 maf, because 2017 was a 9 maf year, the ten-year Lee Ferry flow could drop below the tripwire – 82.5 maf (with two more 9 maf years, 2018 and 2019, in the pipeline).

We recognize that the 24-month studies don’t predict the future. They are a planning and management tool. It’s plausible that by 2027, a series of wet years could result in a ten-year flow that is much higher than 82.5 maf, something that is, in our view, unlikely. But as we sit here in January 2024, the 24-month study is the only planning tool we’ve got. It would behoove us to pay attention to what it is telling us.

If a future 24-month study projects that ten-year flows will fall below 82.5 maf, it will be a big deal for the basin. What provision of the Law of the River will control annual releases from Glen Canyon Dam – the post-2026 Operating Guidelines, the Lower Division’s interpretation of the 1922 Compact (82.5 maf), or the Upper Division’s interpretation of the 1922 Compact (75 maf or less)?  If the Lower Division States agree to a ten-year flow target of less than 82.5 maf, are they effectively surrendering to the Upper Division States? If the Upper Division States agree to a flow target of 82.5 maf, are they effectively surrendering to the Lower Division States? If the Upper Basin states agree to either 82.5 maf or some smaller compromise delivery target and the hydrology remains bad, how will Wyoming, Colorado, New Mexico, and Utah – our states – approach the required water use reductions? What if there is not enough water in storage in Lake Powell (and the other CRSP reservoirs) to release sufficient water to bring the ten-year flows to 82.5 maf? Will the Lower Division insist that that the UCRC implement a curtailment of post-compact uses in the Upper Basin. If the UCRC refuses to do so, will that plunge the Basin into litigation?

The structural deficit refers to the consumption by Lower Basin states of more water than enters Lake Mead each year. The deficit, which includes losses from evaporation, is estimated at 1.2 million acre-feet a year. (Image: Central Arizona Project circa 2019)

At the recent 2023 CRWUA meeting, representatives of the Lower Division States stepped up and made it clear they own the “structural deficit,” and the conference was buzzing with talk of the innovative system approach the Lower Division has put on the table. This is great news, but as Colorado’s Royce Tipton concluded sixty years ago, the “structural deficit” is not a single number. It’s a range that depends on the interpretation of the Lee Ferry obligations of the Upper Division States under the 1922 Compact. If the average annual flow requirement is 8.25 maf/year, (which Tipton referred to as “fictional”) he calculated the deficit to be about 1.2 maf/year. Today we believe it’s about 1.4 -1.5 maf/year (Tipton’s assumptions about system losses were probably too low and perhaps his Lee Ferry to Lake Mead inflow assumptions too high). If, however, the average annual flow requirement is 7.5 maf/year, he calculated the deficit to be about 2 maf/year, today maybe 2.2 maf/year. This difference is huge, especially for the Central Arizona Project, the junior user on the Lower basin mainstem.

In the past decades, water managers in the Colorado River Basin have made accomplishments that even two decades ago were considered out of reach: The 2019 Drought Contingency Plans, the shortage sharing agreements with Mexico, the increased recognition of the rights of the Basin’s Native American communities are just a few. The Lower Division’s recent pronouncement that they own the structural deficit is another major step forward, but it has a fundamental flaw. Representatives of all seven Basin states continue to stubbornly insist that the Law of the River, and specifically, the 1922 Colorado River Compact, will serve as the “foundation” of the post-2026 operating guidelines. The flaw is that is that we don’t know if this foundation is based on a ten-year Lee Ferry flow of 82.5 maf, or 75 maf, or something different.

Put simply, the states agree that the Law of the River has to be the basis of what we do, but don’t agree on what the Law of the River actually says. [ed. emphasis mine] Without an agreement on this fundamental issue, calling the 1922 Compact a foundation is nothing more than self-delusional wishful thinking. Now that the Lower Division States have agreed to own the structural deficit, is the next step for all seven states and the federal government to openly acknowledge that given the impacts of climate change on the river, the 1922 Compact’s overallocation of water and its disputed Lee Ferry flow provisions are core problems for the basin, not the foundation? Finding a sustainable future, without litigation, will require accepting and acknowledging the basic problems we face, not avoiding them.

Map credit: AGU

Navajo Dam operations update January 19, 2024 #SanJuanRiver #ColoradoRiver #COriver #aridification

Bluff UT – aerial with San Juan River and Comb Ridge. https://commons.wikimedia.org/w/index.php?curid=6995171

From email from Reclamation (Susan Novak Behery):

January 17, 2024

At 3:00 PM on January 29th (Monday), the release at Navajo Dam will be transferred to the 4×4 Auxiliary outlet, where the release will be reduced to 250 cfs.  The minimum release will accommodate instream work for the Turley Manzanares Ditch Company Diversion Dam Rehabilitation Project.  The release will be transferred back to the power plant and increased back to its current level of 350 cfs at 8:00 AM the following morning, January 30th, 2024 (Tuesday). You may expect some silt and discoloration downstream in the river during this time due to the location of the intake of the 4×4.

This scheduled operation is subject to changes in river flows and weather conditions.  If you have any questions, please contact Susan Behery (sbehery@usbr.gov or 970-385-6560), or visit Reclamation’s Navajo Dam website at https://www.usbr.gov/uc/water/crsp/cs/nvd.html

#ColoradoRiver January 2024 Most Probable 24-Month Study — Reclamation #COriver #aridification #LakeMead #LakePowell

Map credit: AGU

Click the link to read the memo on the Reclamation Website (Noe Santos and Alex Pivarnik):

The operation of Lake Powell and Lake Mead in the January 2024 24-Month Study is pursuant to the December 2007 Record of Decision on Colorado River Interim Guidelines for Lower Basin Shortages and the Coordinated Operations of Lake Powell and Lake Mead (Interim Guidelines) and reflects the draft 2024 Annual Operating Plan (AOP). Pursuant to the Interim Guidelines, the August 2023 24-Month Study projections of the January 1, 2024, system storage and reservoir water surface elevations set the operational tier for the coordinated operation of Lake Powell and Lake Mead during 2024.

The August 2023 24-Month study projected the January 1, 2024, Lake Powell elevation to be less than 3,575 feet and at or above 3,525 feet and the Lake Mead elevation to be at or above 1,025 feet. Consistent with Section 6.C.1 of the Interim Guidelines the operational tier for Lake Powell in water year (WY) 2024 will be the Mid-Elevation Release Tier and the water year release volume from Lake Powell will be 7.48 million acre-feet (maf).

The 2022 Drought Response Operations Agreement (DROA) Plan1 for May 2022 through April 2023 was amended to suspend 2022 DROA Plan releases as of March 7, 2023. A total DROA release of approximately 463 thousand acre-feet (kaf) occurred under the 2022 DROA Plan. Reclamation will attempt to maximize DROA recovery in the Upper Initial Units in WY 2023 and through April 2024. Reclamation will provide monthly DROA accounting, including DROA releases and recovery, which can be found online at: https://www.usbr.gov/ColoradoRiverBasin/documents/dcp/DROA/DROSummarySheet.pdf.

In May of 2023, the DROA Parties agreed to the 2023 DROA Plan. The 2023 DROA Plan does not include any DROA releases, but rather provides for recovery of prior DROA releases from the units upstream of Powell.

Reclamation will continue to carefully monitor hydrologic and operational conditions and assess the need for additional responsive actions and/or changes to operations. Reclamation will continue to consult with the Basin States, Basin Tribes, Mexico, and other partners on Colorado River operations to consider and determine whether additional measures should be taken to further enhance the preservation of these benefits, as well as recovery protocols, including those of future protective measures for both Lakes Powell and Mead.

The August 2023 24-Month Study projected the January 1, 2024 Lake Mead elevation to be below 1,075 feet and above 1,050 feet. Consistent with Section 2.D.1 of the Interim Guidelines, a Shortage Condition consistent with Section 2.D.1.a will govern the operation of Lake Mead for calendar year (CY) 2024. In addition, Section III.B of Exhibit 1 to the Lower Basin Drought Contingency Plan (DCP) Agreement will also govern the operation of Lake Mead for CY 2024. Lower Basin projections for Lake Mead take into consideration updated water orders to reflect additional conservation efforts under the LC Conservation Program.

#LakePowell Is Still in Trouble. Here’s What’s Good and What’s Alarming About the Current Water Level: Low water puts a hydropower plant at risk and highlights volatility for an important form of clean energy — Inside #Climate News #ColoradoRiver #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Click the link to read the article on the Inside Climate News website (Dan Gearino):

January 11, 2024

What do you call a situation that remains a crisis, but has ever so slightly improved?

I’m asking myself this as I look at the latest water level data for Lake Powell, the reservoir in Arizona and Utah that feeds the Glen Canyon hydropower plant and is a conduit for drinking water for parts of several states.

The level on Monday was 3,568 feet above sea level, according to the Bureau of Reclamation, the federal agency that manages the reservoir and the power plant.

On the same day last year, the water was at 3,525 feet—a difference of 43 feet. That was close to the reservoir’s lowest level since it was initially being filled in the 1960s.

Both the current level and last year’s are much lower than is optimal, following years of drought and overallocation of the reservoir’s water. But officials have some breathing room thanks to last year’s wet winter, which led to an above average, and in some areas, record snowpack that helped replenish some of what had been lost.

“We’ve kind of been digging ourselves out of a hole,” said Bart Miller, the healthy rivers director at Western Resource Advocates, a conservation nonprofit based in Boulder, Colorado. “The one wet year that we had is only getting a part of the way there … We still have a lot of work to do to put our demands for water back into balance with what the river provides.”

He’s talking about the Colorado River, which passes through Lake Powell. The Colorado River Basin is a source of water and hydropower for about 40 million Americans.

But this brief reprieve may soon be done because of low precipitation in recent months. The Bureau of Reclamation has noted the lack of rain and snow and last month reduced its estimate for how much water would flow into the lake in 2024. To give a sense of the scale of the problem, snowpack in the Upper Colorado River Basin was at 65 percent of normal this week.

The lake and its 1,320-megawatt power plant get a lot of attention because of their importance to millions of water and electricity consumers, and because the water level has gotten perilously close to shutting off the flow to the power plant.

Lake Powell key elevations. Credit: Reclamation

If the level falls to 3,490 feet—78 feet below this week’s reading—water will be too low to spin the turbines that generate electricity.

If the level falls to 3,370 feet—198 feet below this week’s reading—it would reach “dead pool” status, when the water is too low to flow downstream from the dam. The results would be catastrophic for communities south of the dam, as David Dudley explained last year in Sierra magazine.

The Bureau of Reclamation does regular forecasts to have an idea of these risks. A report issued in August projects that there is essentially a zero percent chance that the power plant will be forced offline this year, but a 3 percent chance the water level will drop enough to force a shutoff in 2028.

Lake Powell is one several prominent examples of water resources that are at risk because of drought that climate change has exacerbated and the overallocation of the Colorado River. Downriver is another example, Lake Mead, whose low water levels have led to heightened concerns about the Hoover Dam power plant, as Rhiannon Saegert wrote for the Las Vegas Sun in August.

The Biden administration is working with states that rely on the Colorado River to find ways to conserve water and maintain adequate flow through Lake Powell and Lake Mead. The administration revised the operating guidelines for the lakes in April, including measures to better give notice to operators of irrigation systems and water utilities about water delivery reductions, and giving the Bureau of Reclamation more flexibility to conserve and store water.

“Failure is not an option,” said Tommy Beaudreau, who was then deputy secretary of the Interior, in an April statement.

Hydroelectric Dam

Let’s take a few steps back. Hydropower plants have long been some of the most reliable sources of carbon-free electricity. The country gets 6 percent of its electricity from hydropower, which is more than any other utility-scale renewable source except for wind.

But drought and other extreme weather events are making hydropower increasingly volatile. The ups and downs show up in national figures; 2021 and 2022 were two of the three lowest years for hydropower generation since 2010, according to the Energy Information Administration. (This doesn’t include 2023, for which full-year records are not yet available.)

The shifts look ever more drastic at the state level.

From October 2022 to September 2023, hydropower generation in Washington State—the national leader in hydropower—was down 23 percent compared to the previous 12-month period.

In that same timeframe, California increased its hydropower generation by 72 percent.

Credit: Inside Climate News

The “why” comes down to local factors such as drought or recovery from drought. For grid operators, the takeaway is that hydropower isn’t as steady as it used to be.

There also is a growing view among environmental and justice advocates that hydropower has harmful effects on plants and animals, and can lead to an increase in methane emissions. And, construction of reservoirs has often displaced Indigenous communities.

Some of those advocates, with support from farmers, are saying the Colorado River should be allowed to flow freely through the area where the Glen Canyon Dam now stands in order to improve the availability of water south of the dam, among other benefits. Ian James of the Los Angeles Times wrote about this in September.

While the idea doesn’t have widespread support, it’s not being dismissed in the way it might have been a decade ago, when the problems with the dam were less apparent.

Federal officials have resources to prepare for declining water levels on Lake Powell, but they are dealing with symptoms of larger problems: climate change and a demand for water that exceeds a shrinking supply.

For now, the news is better than it was last year at this time, but Miller isn’t treating this like a victory.

“We haven’t solved the problem,” he said. “We’re still in this place where we need to do a lot of work.”

The next coordination meeting for the operation of the Aspinall Unit is scheduled for Thursday, January 18th 2024, at 1:00 pm — Reclamation #GunnisonRiver #ColoradoRiver #COriver #aridification

Black Canyon July 2020. Photo credit: Cari Bischoff

From email from Reclamation (Erik Knight):

The next coordination meeting for the operation of the Aspinall Unit is scheduled for Thursday, January 18th 2024, at 1:00 pm.

This meeting will be held at the Holiday Inn Express in Montrose, CO. There will also be an option for virtual attendance via Microsoft Teams. A link to the Teams meeting will be emailed next week along with the meeting handouts.

The meeting agenda will include a review of operations and hydrology since August, current soil and snowpack conditions, a discussion of hydrologic forecasts, the weather outlook, and planned operations for this water year. There will also be a presentation by American Whitewater on the development of the Environmental & Recreational Flow Tool.

Aspinall Unit dams

Reservoir Storage at the End of 2023 – Holding On to What We Have — Jack Schmidt (Center for #ColoradoRiver Studies) #COriver #aridification

Click the link to read the article on the Center For Colorado River Studies website (Jack Schmidt):

January 9, 2024

There was not much loss in reservoir storage in the Colorado River basin in December 2023. Total storage in the basin’s reservoirs only declined by 17,000 acre feet during the month, and the combined contents of Lake Mead and Lake Powell increased by 68,000 acre feet. At year’s end, the basin’s water users have only consumed 21% of the gain in storage caused by the large snowmelt of 2023.

Here are a few graphs depicting where we stand at the start of the new year.

1. The amount of water stored in the basin’s reservoirs remains at an unprecedented low condition. On 31 December 2023, total basin storage was 28.0 million acre feet (af), of which 17.5 million af was in Lake Mead and Lake Powell (Fig. 1). The total amount of water stored in the basin is the same as it was in early May 2021. At that time, storage was less than at any other time in the 21st century, but we drained the reservoirs much more in the summer and fall of 2021 and 2022. The recovery of storage caused by the large runoff in 2023 provided some relief to the ongoing water-supply crisis, but water storage remains critically low. 

Figure 1. Graph showing active water storage in 42 reservoirs in different parts of the Colorado River basin. Conditions at the end of December 2023 are comparable to conditions in early May 2021, indicated by the black arrows. Data downloaded at https://www.usbr.gov/

2. Most of the basin’s water storage is in Lake Mead and Lake Powell (Fig. 2). Releases from Lake Powell and reductions in Lower Basin water use were sufficiently large that there was significant recovery of storage in Lake Mead. At the end of December, storage in Lake Mead (9.05 million acre feet) exceeded storage in Lake Powell (8.44 million acre feet) by approximately 600,000 acre feet. The difference in storage between the two reservoirs is much less than during the previous two years when more water was stored in Lake Mead.

Figure 2. Graph showing water storage since January 2021. Note that storage in Lake Mead was significantly greater than in Lake Powell in 2021 and 2022. Large spring runoff in 2023 was captured in Lake Powell, and some of that accumulated inflow was subsequently released to Lake Mead. The rate of reduction in storage in reservoirs upstream from Lake Powell significantly slowed after mid-fall 2023. The category “other Upper Basin reservoirs” includes Strawberry, Granby, McPhee, Dillon, Starvation, Nighthorse, and smaller reservoirs. Water storage in Lake Mohave and Lake Havasu remains nearly constant. Note that the vertical axis is an arithmetic scale that has a break. Data downloaded at https://www.usbr.gov/

3. The rate of loss in reservoir storage this year remains low relative to the rate of loss in previous years (Fig. 3), especially the rate of decline of the combined storage in Lake Mead and Lake Powell. (Fig. 4) The basin’s water managers are doing a good job of reducing use and conserving water in reservoirs. Reclamation’s estimate of probable consumptive water use in the Lower Basin in 2023, issued 31 December 2023, is 5.78 million acre feet, nearly 900,000 acre feet less than Lower Basin consumptive use in 2022. Will that degree of water conservation be enough? That depends on how much snowmelt occurs this spring.

Figure 3. Graph showing the rate of reduction in basin-wide reservoir storage in each of the past ten years. The reduction in storage has been at a much slower rate than in other years. Each year that plots lower than 2023 on this graph reflects a higher rate of loss in storage than this year.
Figure 4. Graph showing the rate of reduction in the combined storage in Lake Mead and Lake Powell in each of the past ten years. The reduction in storage has been slower than in any other recent year. Each year plotting lower than 2023 on this graph reflects a higher rate of loss in storage than in this year.

Acknowledgement: Eric Kuhn and John Fleck provided helpful suggestions that improved this posting.

Navajo Unit Coordination Meeting January 16, 2024 — Reclamation #SanJuanRiver #ColoradoRiver #COriver #aridification

San Juan River Basin. Graphic credit Wikipedia.

From email from Reclamation (Susan Novak Behery):

The next coordination meeting for the operation of the Navajo Unit is scheduled for Tuesday, January 16th 2024, at 1:00 pm. This meeting is open to the public and will be held as a hybrid meeting with the following attendance options: 

  • In-person: Farmington Civic Center, 200 West Arrington, in Farmington, New Mexico.  
  • Virtual attendance: For those who wish to remain remote, there is a Teams video option below. This link should open in any smartphone, tablet, or computer browser, and does not require a Microsoft account You will be able to view and hear the presentation as it is presented.   

We hope the options provided make it possible for all interested parties to participate as they are able and comfortable.  If you are using a virtual option, please try to log on at least 5-10 minutes before the meeting start time. For technical issues, feel free to call the number below.   

A copy of the presentation and meeting summary will be distributed to this email list and posted to our website following the meeting. If you are unable to connect to the video meeting, feel free to contact me (information below) following the meeting for any comments or questions.  

The meeting agenda will include a review of operations and hydrology since August, current soil and snowpack conditions, a discussion of hydrologic forecasts and planned operations for remainder of this water year, updates on maintenance activities, drought operations, and the Recovery Program on the San Juan River.   

If you have any suggestions for the agenda or have questions about the meeting, please call Susan Behery at 970-385-6560, or email sbehery@usbr.gov.  Visit the Navajo Dam website at https://www.usbr.gov/uc/water/crsp/cs/nvd.html for operational updates.

#ColoradoRiver States Are Racing to Agree on Cuts Before Inauguration Day: #California, #Arizona and others, fearing a political shake-up of negotiating teams after the November election — The New York Times #COriver #aridification

A field of produce destined for grocery stores is irrigated near Yuma, Ariz., a few days before Christmas 2015. Photo/Allen Best – See more at: http://mountaintownnews.net/2016/02/09/drying-out-of-the-american-southwest/#sthash.7xXVYcLv.dpuf

Click the link to read the article on The New York Times website (Christopher Flavelle). Here’s an excerpt:

January 6, 2024

Negotiators are seeking an agreement that would prepare for extraordinary cuts in the amount of river water that can be tapped.

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

“How do we live with the river that we have, not the river that we hope and dream for?” said Becky Mitchell, the lead negotiator for the state of Colorado…

The rules that govern the distribution of Colorado River water expire at the end of 2026. Negotiators are trying to reach a deal quickly, in case the White House changes hands. It’s not the prospect of a Republican administration that is particularly concerning, negotiators said, but rather a change in personnel and the time required to build new relationships between state and federal officials…

“Whenever there’s an administration change, that significantly disrupts things,” said JB Hamby, chairman of the Colorado River Board of California and that state’s lead negotiator. “If we can get a draft ready and in place by the end of the year, that will ensure that we get the hard work done.”

From left, J.B. Hamby, chair of the Colorado River Board of California, Tom Buschatzke, Arizona Department of Water Resources; Becky Mitchell, Colorado representative to the Upper Colorado River Commission. Hamby and Buschatzke acknowledged during this panel at the Colorado River Water Users Association annual conference that the lower basin must own the structural deficit, something the upper basin has been pushing for for years. CREDIT: TOM YULSMAN/WATER DESK, UNIVERSITY OF COLORADO, BOULDER