Gross Reservoir Expansion Project

There are many steps to building a dam 471 feet high. Final dam design will continue into 2020 to meet our current completion date of 2025. A lot of other preparatory work is required such as quarrying and preparing the existing dam and foundation for the new dam.

Denver Water is committed to working closely with residents to ensure safety and open communication throughout construction.

Latest News / Blog

Denver Water submits 1041 permit application with Boulder County

On Sept. 21, Denver Water submitted its 1041 permit application with Boulder County for the Gross Reservoir Expansion Project. The application document is available to view here. We look forward to Boulder County’s 1041 review of the Gross Reservoir expansion with...

Drilling tests to run Oct. 5-30

Beginning Monday, Oct. 5, Denver Water will begin a subsurface investigation that will involve drilling operations close to Osprey Point. This work will inform Denver Water on the suitability of the proposed Osprey Point quarry location for the Gross Reservoir...