Expanding Gross Reservoir will help protect our customers from negative impacts of a future drought and shortfalls in our overall water storage system.
This project will increase Gross Reservoir’s capacity to 119,000 total acre-feet by adding an additional 77,000 acre-feet. 72,000 acre-feet will be for Denver Water use and 5,000 acre-feet will go to the environmental pool that provides additional water for South Boulder Creek during low flow periods and provides enhanced stream flow to a 17 mile stretch of South Boulder Creek located below the reservoir. The additional water supply will come from winter and spring runoff during high runoff months of May, June and July. Water will not be diverted for this project during low flow months and when water is scarce.
The Gross Reservoir Expansion Project is one of the major elements of Denver Water’s long-term supply plan. It will prevent future shortfalls during droughts and correct a serious imbalance in our North-South collection system. With this project, we will provide more water to customers while improving the environment surrounding the planned expansion.