News

Chimney Hollow Reservoir Project Wins West Regional Dam Safety Award

The award recognizes projects that make exemplary contributions to the improvement of dam safety in the United States.

Downstream Tunnel Portal Gets Finishing Touches

The final touches on the downstream portal were added at the end of September and include the words “Chimney Hollow 2025” over the entrance.

Uranium Monitoring, Testing and Modeling Continue

We are following a rigorous process, starting with geochemical characterization and scoping studies, to inform mitigation alternatives analysis and ultimately select a final approach.

System to get Water in and Out of Chimney Hollow Nearly Complete

The water conveyance system used for delivering water in and out of Chimney Hollow Reservoir is constructed and nearly complete.

More Than 35,000 Cubic Yards of Concrete Placed at Chimney Hollow

Concrete was used in almost every area of the project, including the plinth, spillway, thrust blocks, valve house, tunnel lining, inlet/outlet, tower, staff gauge and more. 

Chimney Hollow Main Dam Complete

The tallest new dam built in the United States in the last 25 years is now complete. Crews celebrated the huge milestone during an all-site safety meeting on Aug. 7. 

Final Asphalt Placed on the Main Dam

After 1,000 days, 3.3 million work hours and 512 lifts encompassing 200 miles of asphalt paving, a huge milestone was reached on Friday, July 18, as crews placed the final lift of asphalt.

Larimer County Natural Resources sets plan into motion at Chimney Hollow Open Space

Positive momentum continues to build at Chimney Hollow Open Space with the adoption of Larimer County Natural Resources adaptive management plan.

Bulkhead Dry Test Complete

An important but rarely used piece of infrastructure successfully passed dry testing last month, bringing all dry testing at Chimney Hollow Reservoir to a close.