Gross Reservoir Expansion Project
Construction
The Gross Reservoir Expansion Project will undergo approximately three years of design, finishing in 2021, followed by the start of construction in 2022.
Primary dam construction is anticipated to last two construction seasons, a total of 18 months. During this time, work at the construction site will often be 24 hours a day, 7 days a week. The project involves the raising of the existing 340 foot tall Gross Dam by an additional 131 feet to create the new larger reservoir and additional storage. Based on the concept design, once complete, Gross Reservoir will be the tallest dam in Colorado and will contain about 1.5 million cubic yards of concrete, about half the volume of Hoover Dam.
Technically Speaking
The U.S. Army Corps of Engineers, Omaha District Regulatory Branch, prepared an Environmental Impact Statement beginning in 2003 to analyze environmental effects of enlarging the existing Gross Reservoir (near Boulder, Colorado) to supply 18,000 acre-feet per year new firm yield of water to its Moffat Collection System. On July 6th 2017, the U.S. Army Corps of Engineers approved Denver Water’s request to raise Gross Dam in Boulder County.
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Latest News / Blog
Dam foundation preparation, quarrying and site preparation activities at Gross Reservoir
Dam foundation preparation, quarrying and site preparation activities involving drilling and blasting are scheduled to begin at Gross Reservoir today, April 12. Please note: Blasting will only take place during daylight hours. Drilling and blasting activities are...
Heavy equipment to travel to Gross Reservoir Expansion Project site
March 28, 2022 - Between March 28 and April 2, weather permitting, Kiewit Barnard Joint Venture will mobilize large equipment to the Gross Reservoir Expansion Project site. This activity will consist of a maximum of four caravans over the course of two nights. Each...