Stumbling Toward “Day Zero” on the #ColoradoRiver: Urgent action needed from seven states and feds to avoid #water crisis — Audubon #COriver #aridification

Common Raven. Photo: Doug Kliewer/Audubon Photography Awards

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

The Colorado River Basin is inching ever closer to “Day Zero,” a term first used in Cape Town, South Africa when they anticipated the day in 2018 that taps would run dry. Lakes Powell and Mead, the Colorado River’s two enormous reservoirs, were full in 2000, storing more than four years of the river’s average annual flow. For more than two decades water users have been sipping at that supply, watching them decline. Long-term drought and climate change is making this issue potentially catastrophic.

Today the entire Colorado River reservoir storage system is 2/3 empty.

Moreover, federal officials project that within two years, the water level in Lake Powell could be so low that it would be impossible for water to flow through the dam’s turbine intakes. When that happens, it’s clear the dam will no longer generate hydropower, but it’s also possible the dam will not release any water at all. That’s because the only other way for water to move through the dam when the water is low is a series of outlet tubes that were not designed, and have never been tested, for long-term use.

What happens if little to no water can be released from Lake Powell? Water supply risks multiply for everyone who uses water downstream. That includes residents of big cities like Las Vegas, Phoenix and Los Angeles, and farmers and ranchers in Arizona, California and Mexico who grow the majority of our nation’s winter produce, as well as numerous Native American tribes. Some of these water users have alternative supplies, but some—including Las Vegas residents, Colorado River tribes and most farmers—do not. Day Zero for these water users might not happen immediately as Lake Mead, the reservoir fed by Lake Powell still has some water in it. But without flows from upstream to replenish it, Lake Mead would also be at risk of no longer being able to release water.

There is also the river itself. Think of it—no water flowing through the Grand Canyon. No water flowing in the Colorado River for hundreds of miles downstream from Hoover Dam. That’s an ecological disaster in the making for 400 bird species and a multitude of other wildlife, exceeding the 20th century devastation of the Colorado River Delta.

In recent days, state and federal officials have announced plans to address the immediate crisis. These plans will help, but only to avert the immediate danger looming over the basin for the current year. They do nothing to decrease the unrelenting risks of Colorado River water supplies and demands out of balance, because all they do is move water from one place to another. The federal plan to reduce water releases from the Glen Canyon Dam will help this year, as Lake Powell will hold onto water that would otherwise have flowed downstream to Lake Mead. Notably, Lower Basin water users will calculate their uses as if the water was in Lake Mead anyway, delaying deeper cuts and further depleting the reservoir. The Upper Basin states also plan to release additional water from Flaming Gorge reservoir upriver in Wyoming to increase the inflow into Lake Powell. This too will help Powell, but it will reduce the supply in Flaming Gorge reservoir. The plan acknowledges this supply may not be recovered unless and until storage at Lake Powell considerably improves. Both of these plans will move water and help protect the Glen Canyon Dam’s operations in the near-term.

Moving water does not address the fundamental challenge in the Colorado River Basin and does not offer any real certainty for water users or the river itself in any corner of the basin. Colorado River water demands exceed supplies. Audubon knows that fundamentally, because we work on restoring habitat in the Colorado River Delta, where the river has not flowed regularly for half a century. With major reservoirs only one third full, plans that continue to drain them are not sustainable plans.

Brad Udall: Here’s the latest version of my 4-Panel plot thru Water Year (Oct-Sep) of 2021 of the Colorado River big reservoirs, natural flows, precipitation, and temperature. Data (PRISM) goes back or 1906 (or 1935 for reservoirs.) This updates previous work with @GreatLakesPeck.

Climate change is drying out the Colorado River. In the last two decades, the river’s flow has been 20 percent less than the average flow recorded in the 20th century. Hoping for a rainy season won’t fix this. Today’s water supply conditions are likely to be among the best we see over the coming decades.

What’s needed now, urgently, is for federal and state water managers to work, in partnership with tribes and other stakeholders, to take the steps necessary to build confidence in the enduring management of the Colorado River. This will require focus and dedicated resources to develop and implement plans that put water demands into balance with supplies. That means moving beyond year-to-year reactions to imminent risks to engage in planning that promotes water conservation. Water conservation means using less water, preferably managed in a way that both respects our system of water rights and supports society’s 21st century values, including economic stability for urban and rural communities, allowances for Native American tribes to realize benefit from their water rights, and reliable water supplies for nature.

People and birds rely on the Colorado River, and Audubon will continue to work with partners to advocate for and implement solutions. We know what works. Water conservation pilots implemented throughout the basin and across municipal and agricultural sectors have been successful. Investments in infrastructure upgrades have durably made water uses more efficient, and investments in habitat restoration have benefited ecosystems and the birds that rely on them. Flexible water sharing mechanisms have modernized water uses while protecting legal water rights and helped Tribes secure benefits. There is no time like the present to begin implementing these solutions at scale. They should be the foundation for new rules for how we use and protect the Colorado River.

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

Bug Flow experiment to be conducted this summer under the Glen Canyon Dam Long-Term Experimental and Management Plan — Reclamation #ColoradoRiver #COriver #aridification

A rare sight: Water shoots out of Glen Canyon Dam’s river outlets or “jet tubes” during a high-flow experimental release in 2013. Typically all of the dam’s outflows go through penstocks to turn the turbines on the hydroelectric plant. The outlets are only used during these experiments, meant to redistribute sediment downstream, and when lake levels get too high. Spillways are used as a last, last resort. The river outlets may be used again in the not so distant future: Once Lake Powell’s surface level drops below 3,490 feet, or minimum power pool, water can no longer be run through the turbines and can only be sent to the river below via the outlets. This is cause for concern because the river outlets were not built for long-term use. Jonathan P. Thompson photo.

Click the link to read the release on the Reclamation website:

The Bureau of Reclamation announced today a Macroinvertebrate Production Flow, or Bug Flow, will be conducted this summer at Glen Canyon Dam under the Long-Term Experimental and Management Plan. This experiment is designed to improve egg-laying conditions for aquatic insects that are the primary food source for fish in the Colorado River. The experiment will begin May 1 and continue through August 31, 2022.

The decision to conduct this experiment was based on input from a collaborative team, including the Department of the Interior’s Bureau of Reclamation, U.S. Geological Survey, National Park Service, U.S. Fish and Wildlife Service and Bureau of Indian Affairs. Flow experiments are designed to optimize benefits to the Lees Ferry Reach and Grand Canyon’s Colorado River ecosystem while meeting water delivery requirements and minimizing negative impacts to hydropower production.

“We are pleased to continue our research on the effects of modifying release flow patterns to benefit the Colorado River ecosystem,” said Michael Moran, Acting Chief of the U.S. Geological Survey Grand Canyon Monitoring and Research Center, which monitors Colorado River ecosystem response to all Glen Canyon Dam flow experiments. “Past research has shown that many different resources have benefitted from previous experimental flows, and we are looking forward to collecting this additional data on the river.”

Bug Flows are a water flow experiment that consists of steady, low weekend releases from Glen Canyon Dam and normal fluctuating releases for hydropower during weekdays. Bug Flows do not affect total annual, monthly or weekly release volumes from Lake Powell through Glen Canyon Dam, but slightly modify release schedules and flow rates. Recreational river users will likely notice steady flows resulting from the steady weekend releases as they move downstream through the Lees Ferry Reach and the Grand Canyon. Dam releases and minimum flows are within the range typically experienced by recreation users (e.g., anglers, boaters, kayakers and campers).

“In this time of unprecedented drought, continuing experiments like Bug Flows in compliance with the Grand Canyon Protection Act is critical,” said Reclamation’s Upper Colorado Basin Regional Director Wayne Pullan. “At the same time, drought makes assessing and mitigating for the effects of those experiments on other resources like hydropower, water supply and recreation increasingly important.”

The purpose of these experimental flows is to identify whether this type of operation can improve the abundance, diversity and stability of aquatic insect populations, thereby increasing aquatic insect prey available for a variety of wildlife. Insects expected to benefit from this experiment are an important food source for many species of fish, birds, and bats in the canyon. Insects expected to benefit from this experiment are an important food source for many species of fish, birds, and bats in the canyon.

Bug Flow experiments were implemented at Glen Canyon Dam from May through August for three consecutive years: 2018, 2019 and 2020, but were not implemented in 2021. Findings suggest that the previous Bug Flow experiments may have improved conditions for adult insects, increased the abundance of caddisflies river wide, and increased algae production. In addition, anglers captured more rainbow trout on average during Bug Flows than they did during typical fluctuating flow patterns. Contrary to predictions, no increase in the abundance of midge’s flies were observed during the first three years of the experiment. Scientists believe that further experimentation, research and monitoring may help to determine whether the Bug Flows experiment benefits native fishes in the Lees Ferry Reach below the Glen Canyon Dam and in the Grand Canyon. This experiment provides scientific information important to future decision-making.

The Glen Canyon Dam Implementation Team will closely monitor the condition of resources during the experiment and may terminate implementation at any time if unanticipated negative impacts are observed or are likely to occur due to ongoing drought and low lake levels.

Native American tribes assert #water rights on #ColoradoRiver Basin: 1922 compact that divided the water between states left out tribes, which own 25% rights — The #Cortez Journal #COriver #aridification

Lake Nighthorse in the Ridges Basin in La Plata County, Colorado. The view is from the overlook on County Road 210. By Jeffrey Beall – Own work, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=81402953

Click the link to read the article on The Cortez Journal website (Jim Mimiaga). Here’s an excerpt:

Ute Mountain Chairman Manuel Heart and Southern Ute Council member Lorelei Cloud presented their perspectives and plans for water management during a session of the Southwestern Water Conservation District’s annual meeting Friday [April 22, 2022] in Durango. The tribes were not invited to the discussions when the states and federal government divided water rights in the West during the early 20th century. Native Americans did not gain U.S. citizenship until two years after the 1922 Colorado River Compact divided Colorado River water between upper and lower basins.

Cloud said the Southern Ute Tribe has 129,000 acre-feet per year of federally reserved water rights on seven rivers that run through its reservation, but they only have the capacity to divert 40,600 acre-feet per year. The tribe stores water in Vallecito, Lemon and Lake Nighthorse Reservoirs.

The tribe recently built a reservoir to store water for its water treatment plant, which serves 500 households, many of which are nontribal homes in the checkerboard area of the reservation that includes private and tribal lands. The new reservoir allows for a 30-day reserve, up from one-day reserve. Water storage at the treatment plant is critical because it is served by the tribe’s junior water rights on the Pine River, which are vulnerable to calls from senior right holders…

In a historic meeting on March 28 in Albuquerque, 20 tribes, including Utes, met with U.S. Department of Interior Secretary Deb Haaland to discuss their involvement with Colorado River Basin water negotiations. Haaland is the first Native American appointed to the post. Cloud said tribes are now at the table to provide input on the Drought Response Operation Agreement set by the Bureau of Reclamation. The guidelines determine how water is released from Colorado River storage reservoirs.

San Juan River Basin. Graphic credit Wikipedia.