Chimney Hollow Reservoir Project
The Chimney Hollow Reservoir Project is a collaboration between 12 Northeastern Colorado water providers to improve the reliability of, or make firm, water supplies from the Windy Gap Project. Chimney Hollow Reservoir is located just west of Carter Lake in Larimer County to provide dedicated storage to supply a reliable 30,000 acre-feet of water each year for future generations.
Provides storage for 30,000 acre-feet of existing water rights associated with the Windy Gap Project
Provides environmental benefits to Colorado's rivers and streams through various commitments
Enhances recreation opportunities to encourage healthy, outdoor lifestyles for residents
Helps meet an increased demand for water in Northern Colorado communities
News
Initial Water to Move into Chimney Hollow Reservoir in April 2026
Northern Water will move approximately 1,500 acre feet of water into Chimney Hollow Reservoir starting mid-April.
Chimney Hollow Reservoir Project Construction Complete
On Dec. 19, just six years after Barnard Construction signed the contract to build the project, the Chimney Hollow Reservoir Project reached substantial completion, which marks a historic milestone.
Final Chimney Hollow Virtual Tour
In the final virtual tour, the project team gives a look at the project nearly complete, as well as an overview on what it's like to demobilize a project of this size.