#Aurora and #ColoradoSprings Want More #Water. The Proposed Solution — A New Reservoir — Would Have Far-Reaching Impacts — #Colorado Public Radio

This map shows the location of test holes Homestake Partners plans to drill as part of its geotechnical investigation into the feasibility of a dam site in the Homestake Creek valley. The Forest Service has received more than 500 comments, most of them in opposition to, the drilling and the overall reservoir project. Credit: USFS via Aspen Journalism

From Colorado Public Radio (Michael Elizabeth Sakas):

Aurora and Colorado Springs want to bring more of that water to their growing cities, which are the state’s largest after Denver. To do that, they want to dam up Whitney Creek in Eagle County south of Minturn and create a reservoir that could supply water for thousands of new homes…

There are a few different spots along the creek that could be the home to the proposed Whitney Reservoir. The largest of the potential sites would hold about 20,000 acre-feet of water…

Tension between protecting wetlands and securing more water for growing cities

[Jerry] Mallett’s group works to restore and protect areas like this one — a wetland with fox and moose tracks in the snow.

Mallett has fought Aurora and Colorado Springs before. After these cities teamed up and built Homestake Reservoir in the 1960s, they tried to build the reservoir Homestake II. That project was shut down in the 1990s.

“We’re not saying you shouldn’t grow or that you’ve got to control the population, that’s your issue,” Mallett said. “Ours is protecting the natural resources for other values.”

Aurora and Colorado Springs are working together because they have the same problem: Planners don’t think they have enough water where they are to support the cities’ expected growth. If the cities get their way and dam up Homestake Creek, it would reduce the amount of water that ends up in the Colorado River — which the Front Range and some 40 million people have come to rely on over the decades…

That’s changed, Mallett said. West Slope communities now see water as a crucial part of keeping their economies alive and now fight for it to stay. Democratic state Sen. Kerry Donovan represents seven counties that include communities like Aspen and Crested Butte. In a letter opposing the project, Donovan wrote that, “she can’t express how sternly the people in her district dislike water diversion projects to the front range.

“West Slope is not in a position I think today where they’re going to roll over and say, ‘Fine, we’ll lose that water,’” Mallett said. “I think they’ve got the political clout now, it’s a new game.”

If Colorado Springs and Aurora secure permits to build the Whitney Reservoir, it would be the first major trans-mountain water diversion project in decades…

These wetlands, located on a 150-acre parcel in the Homestake Creek valley that Homestake Partners bought in 2018, would be inundated if Whitney Reservoir is constructed. The Forest Service received more than 500 comments, the majority in opposition to, test drilling associated with the project and the reservoir project itself. Photo credit: Heather Sackett/Aspen Journalism

Environmentalists are concerned about losing these wetlands, which are threatened by climate change. Delia Malone, an ecologist and wildlife chair of the Colorado Chapter of the Sierra Club, said most animals rely on wetlands…

Malone said the proposed reservoir locations could include areas that are home to fens, a type of wetland that is rare in the arid West and supports plant biodiversity. Fens have layers of peat, require thousands of years to develop and are replenished by groundwater. Fens also trap environmental carbon, improve water quality and store water…

Colorado and other states are obligated to send a certain amount of water downstream to states like California because of a century-old agreement. As the Colorado River dries with climate change, and more demand is put on the river, Udall said there’s higher risk for what’s called a “compact call,” a provision that gives downstream states like California authority to demand water from upstream states like Colorado for not sending enough water down the Colorado River.

If that happens, Udall said newer Colorado water projects — including the proposed Whitney Reservoir — could have to cut their usage to make sure enough water is sent downstream.

[Brad] Udall said the best available science is needed to answer the question: Is this water better left in the river or sent to Aurora and Colorado Springs?

Brad Udall: Here’s the latest version of my 4-Panel plot thru Water Year (Oct-Sep) of 2019 of the #coriver big reservoirs, natural flows, precipitation, and temperature. Data goes back or 1906 (or 1935 for reservoirs.) This updates previous work with @GreatLakesPeck

“The science really does need to be heard here,” Udall said. “It’s somewhat disturbing and is very different from the science that we used in the 20th century to assess the value and benefits of these kinds of projects.”

Officials in Colorado Springs and Aurora declined CPR News’ interview requests.

Before the cities can move towards building the reservoir, the U.S. Forest Service has to sign off on structural testing and surveying which requires drilling test holes in the wetlands. A decision is expected later this month on that permit, which has received more than 500 public comments, with most arguing against the drilling and the project as a whole.

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