Gross Reservoir Expansion Project

It takes a long time to build a dam 471 feet high. A lot of other preparatory work is required such as quarrying and preparing the existing dam and foundation for the new dam.

The first planned work supporting the project consists of geotechnical drilling (summer 2018) and exploratory work in the Osprey Point Quarry starting after the reservoir is closed to boating for the season in October 2018. Next up, starting as early as 2019, is site development work and road improvements to the roads accessing Gross Dam. Principally, Denver Water is evaluating improvements and/or traffic control options for the intersection at SH72 and Gross Dam Road, and to Gross Dam Road itself.

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

Latest News / Blog

2018 Year-End Report

As work continues on the the Gross Reservoir Expansion Project, we want to highlight some of the progress and milestones achieved throughout 2018. The 2018 Year-End Report can be viewed by clicking the image below.

Daily Camera article on upcoming Boulder County Commissioner Meeting

Boulder Daily Camera – Feb. 1, 2019 – "This hearing does not impact Denver Water's commitment to working with Boulder County and the community to incorporate additional measures to avoid and minimize construction impacts related to the Gross Reservoir Expansion...

A statement from the CEO/Manager

Below is a statement from Denver Water CEO/Manager, Jim Lochhead, regarding the Boulder County land use process: "The location of the current and expanded Gross Dam was defined as a 'Flood Regulatory Area' before the enactment of 1041 permitting in 1974, which makes...