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Gross Reservoir Expansion Project

Securing our future ability to provide safe, reliable water

The Gross Reservoir Expansion Project is a major component of Denver Water’s long-term, multi-pronged approach to deliver safe, reliable water to the more than 1.5 million residents in our service area today and many of the projected millions who will call Colorado home in the decades to come.

Gross reservoir vista

What it would add


acre-feet of water storage


feet of dam height


miles of enhanced flows in South Boulder Creek


miles of shoreline

The project will raise the height of the existing dam by 131 feet, which will allow the capacity of the reservoir to increase. Once permits are secured, we expect construction to take place in phases. The project website details expansion plans, permitting, construction and timing.