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Last Update: 09/22/2026 at 11:33 PM EST
Gross Reservoir Faces Climate Review Appeal
Coverage from Spencer Fane, The Colorado Sun, and others
The Gross Reservoir expansion in Boulder County, Colorado, is at the center of a federal appeal over whether its environmental review adequately considered climate-driven flow reductions, lower precipitation, downstream effects, and alternatives.
Denver Water and the U.S. Army Corps of Engineers support the project as a source of Denver-area water storage, while environmental groups argue that expanding capacity could increase pressure on the Colorado River Basin. The ruling may clarify how climate and water-availability risks must be assessed in major Western water projects.
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All Articles5 articles
Important
The Tenth Circuit on September 15, 2026, cleared Denver Water to complete and fill Colorado's expanded Gross Reservoir after upholding Army Corps permits.
9/18/2026 • Policy, Politics & Governance • General
Denver Water and environmental groups return to the 10th Circuit Court of Appeals on July 31 in Santa Fe to challenge permits and an injunction affecting Gross Reservoir expansion in Colorado.
5/28/2026 • Policy, Politics & Governance • General
Interesting
The 10th U.S. Circuit Court of Appeals is considering whether the U.S. Army Corps of Engineers adequately assessed climate and water-supply risks in Denver Water's Gross Reservoir expansion near Boulder, Colorado.
8/20/2026 • Policy, Politics & Governance • General
Additional
In 2025, the 10th U.S. Circuit Court of Appeals heard arguments over whether the Army Corps and Denver Water adequately assessed climate risks for the Gross Reservoir expansion in Colorado.
8/15/2026 • Policy, Politics & Governance • General
The 10th U.S. Circuit Court of Appeals heard arguments in Santa Fe on whether climate change and declining Colorado River supplies require additional review of Denver Water's Gross Reservoir expansion.
8/15/2026 • Policy, Politics & Governance • General