Click the link to read the article on The Denver Post website (Elise Schmelzer). Here’s an excerpt:
April 4, 2025
Colorado’s largest water provider must stop construction on a $531 million dam expansion already underway in Boulder County after a federal judge found that assessments of how the project would impact the environment were flawed. U.S. District Court Judge Christine Arguello in an order late Thursday blocked Denver Water from enlarging Gross Reservoir east of Nederland until major federal environmental permitting processes are redone. The judge found that allowing the reservoir expansion to continue without redoing the permits would cause irreparable environmental damage that cannot be compensated for by monetary payments. That harm would outweigh any financial costs Denver Water would incur from halting construction, she wrote.
“Environmental injury is often the very definition of irreparable harm — often permanent or at least of long duration,” Arguello wrote. “All parties agree that there will be environmental harm resulting from completion of the Moffat Collection System Project, including the destruction of 500,000 trees, water diversion from several creeks, and impacts to wildlife by the sudden loss of land.”
She issued a preliminary injunction ordering Denver Water to halt construction on the dam until a further hearing when engineers can explain how much further construction is needed to make the partially built dam safe and structurally sound. Denver Water planned to raise the height of the dam by 131 feet, allowing the utility to store more water. She will then issue a permanent injunction on how much more construction will be allowed. The order is a huge victory for environmental groups that for years have opposed the controversial project. A coalition of environmental groups first filed suit in 2018 to stop the expansion of the reservoir, which they say would harm the health of the Colorado River system — where the reservoir’s water is sourced.