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

Notice of utility locate survey work on Gross Dam Road

Beginning May 25, Lamb-Star Engineering, LLC, through a subcontract with Stantec and Denver Water, as part of Stantec’s work on roadway design for safety improvements of Gross Dam Road will be completing utility location surveys along Gross Dam Road. This work will...

Boating opens May 22 at Gross Reservoir; plan for possible crowds

Gross Reservoir opens for boating Friday, May 22, and recreation managers want visitors to be aware of the potential for crowds, slow traffic, lower water levels and parking challenges. The reservoir, southwest of Boulder, is popular with kayakers and others using...

Notice of on-site closure of Gross Dam Road

COAL CREEK CANYON — April 24, 2020 — Access to trails, viewpoints and shorelines on the south side of Gross Reservoir will be closed on weekdays between Monday, April 27, and Friday, May 8, for watershed protection activities in coordination with the Colorado State...