#Snowpack news (November 16, 2021): #NorthPlatteRiver Basin = 95%, best in #Colorado, #RioGrandeRiver Basin = 48%

Colorado snowpack basin-filled map November 16, 2021 via the NRCS.
Westwide SNOTEL basin-filled map November 16, 2021 via the NRCS.

Denver Water reaches Gross Reservoir settlement, but #water supply concerns remain — The #Denver Post #SouthPlatteRiver #ColoradoRiver #COriver #aridification

Gross Reservoir. Photo: Brent Gardner-Smith/Aspen Journalism

From The Denver Post (Conrad Swanson):

The utility will pay millions to mitigate environmental concerns for Boulder County residents

The county received assurances Denver Water would pay to mitigate environmental damages expected from the work, but the deal still left Commissioner Matt Jones “heartsick.” He said commissioners fought for the best deal possible but he’s still concerned about the damage the project could do locally and for the millions of people who depend on the Colorado River…

Climate scientists and legal experts said they’re skeptical the parched Colorado River will provide enough water for Denver Water to fill an expanded Gross Reservoir. And even if the water’s there, the expansion and other projects like it will inevitably worsen water shortages on Colorado’s Western Slope and downstream, they said.

Utility officials, however, hailed the settlement and said that while they won’t be able to fill the reservoir every year — which they’ve known all along — years with above-average precipitation will provide more than enough water.

“We’re gonna fill the reservoir,” Denver Water Project Manager Jeff Martin said.

Climate change is trending in the wrong direction for such strong confidence, cautioned Mark Squillace, the Raphael J. Moses Professor of Natural Resource Law at the University of Colorado Law School.

“This just seems a bit insane to me that Denver Water is unwilling to acknowledge” that climate change is only likely to worsen water shortages on the Western Slope, Squillace said.

Martin said he still expects to break ground on the five-year, $464 million project by April…

  • Denver Water will pay $5 million to residents most impacted by the work and agreed to reduce noise and dust from the project using electric rather than diesel generators.
  • Denver Water’s drivers must complete bicycle awareness training, provide “truck free” days for cyclists and “leave Gross Dam Road in a better condition than before the project.”
  • Denver Water will pay $5.1 million to replace open space lands that would be flooded by the reservoir expansion and transfer 70 acres near Walker Ranch Open Space to Boulder County.
  • Denver Water will pay $1.5 million to reduce greenhouse gas emissions from the project and another $1 million to restore a stretch along South St. Vrain Creek.
  • Squillace said while those terms might benefit county residents, it’s still not enough and he was disappointed to hear commissioners agreed to settle.

    “We were between a rock and a hard place,” Jones said. “We were pushed into this corner of knowing that and trying to figure out what we could get for Boulder County residents…

    Martin said he and others at Denver Water expect to be able to fill the expanded reservoir in average and above-average years. South Boulder Creek, which is not part of the Colorado River system, also feeds into the reservoir and could supplement water in dry years on the Western Slope, he noted…

    [David] Bahr suggested Denver Water could instead pipe in water from the Missouri River or other places in the Midwest that are expected to see more water in the coming years. While Martin said those types of ideas could be explored for the more distant future, Denver Water officials maintain that an expanded Gross Reservoir is the best course of action for now.

    The project could still come to a halt, Squillace said. The more delays the work faces, the more climate data will be available, increasing political pressure for Denver Water to seek another way to secure its water supply.

    “I’m still not so convinced that the project’s ever going to actually be built,” he said.

    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

    #CrystalRiver restoration finding its footing in #Carbondale park: #Colorado Water Conservation Board considering grant to fund half of $1.46 million effort — @AspenJournalism

    The Crystal River widens and becomes shallower just before it passes under the southern bridge into River Valley Ranch. A group of local organizations is working to restore both the stream and the banks.

    From Aspen Journalism (Will Grandbois):

    The town of Carbondale and the Roaring Fork Conservancy are finalizing funding to restore a half-mile stretch of the Crystal River and 18 acres of riparian habitat — provided they can convince Colorado Parks and Wildlife that it can be done with a light touch.

    The location, next to the River Valley Ranch subdivision on the south side of town, is the ideal spot for the effort due to Carbondale’s Riverfront Park on the west side and the headgate for the town-owned Weaver Ditch on the east side, with some associated in-stream impacts.

    As spelled out in a Water Plan grant request to the Colorado Water Conservation Board — originally slated for consideration in September but since pushed back to January — improvements will include streambank stabilization and river channel restoration, plant diversification and better access to the park as well as an automated ditch headgate. Efficiency work is ongoing on the ditch itself, but it is not officially part of the project.

    The cost of the whole effort was originally estimated at $1,466,478, with roughly half hinging on the Water Plan grant. The multifaceted nature of the project lends itself to a wide array of sources to pay for the rest.

    At least eight other agencies have committed funding or are considering grant applications. This includes $100,000 awarded from the Colorado River Water Conservation District in October. Other agencies partnering in the project include the Pitkin County Healthy Rivers Program, Great Outdoors Colorado, Colorado Parks and Wildlife’s Fishing Is Fun Program and the Aspen Valley Land Trust. Carbondale has committed at least $220,000 toward the effort to improve the reach of river described in the Water Plan grant application as “severely to unsustainably degraded.”

    The project’s many layers make it a perfect fit for the Roaring Fork Conservancy (RFC), according to Heather Lewin, director of Watershed Science & Policy.

    “You’ve got so many different things that we’re interested in doing — a flow issue, a riparian corridor, this older ditch outtake and the potential for efficiencies within the ditch itself,” she said.

    Although better access and an outdoor classroom are part of the plan, the majority of the property will remain relatively rustic to provide an authentic outdoor experience and good wildlife habitat.

    Navajo Unit Operations update #SanJuanRiver #COriver #ColoradoRiver #aridification

    Colorado River Storage Project map. Credit: USBR

    From email from Reclamation (Susan Novak Behery):

    Reclamation’s November 24-Month Study includes a minimum probable (90% chance of being exceeded), a most probable (50% chance of being exceeded) and a maximum probable (10% chance of being exceeded) forecast. While Reclamation operates to the most probable forecast, the range of outcomes in the forecast is tracked on a monthly basis. The latest forecast and projected operations no longer show a shortage to contract deliveries at the Navajo Unit for water year 2022 under the minimum probable forecast. This projection will continue to be updated monthly as the forecast evolves.

    Any projected shortage volume is modeled as a proportional distribution to project users (as per PL-87-483 and PL-111-11) and downstream target base flows (pursuant to the Navajo Reservoir’s Record of Decision, 2006).

    In anticipation of increasingly severe drought, the Upper Basin states and Reclamation entered into a Drought Response Operations Agreement in 2019. Under this agreement, Reclamation initiated delivery of supplemental water to Lake Powell from the upper CRSP units beginning in July 2021. The delivery from Navajo Reservoir, originally planned for late November through early December, has been postponed and is currently scheduled as a daily release of 1,300 cfs from December 20th to December 30th for a total of 20,000 acre-ft over our regular release. Reclamation will review this release plan after publication of the December 24-Month Study, currently anticipated mid-December.

    We will continue to closely monitor conditions and projections as we work with the seven Colorado Basin states on a Drought Response Operations Plan in the coming months.