U.S. Army Corps of Engineers 404 Permit and Record of Decision
In July 2017 the U.S. Army Corps of Engineers approved the Gross Reservoir Expansion Project by granting Denver Water its’ 404 permit and Record of Decision. The 404 permit and Record of Decision can be found below.
In September 2016, Denver Water and the U.S. Forest Service reached a Settlement Agreement to address past, current and future impacts Denver Water operations have on USFS resources. The three-part agreement identifies funding and projects to protect and preserve USFS resources, and includes:
Settlement Agreement – the overall master agreement describing the negotiations and resolution of issues.
Appendix 1 – 4(e) Conditions related to operation and maintenance of the Gross Expansion Project – these conditions will be part of the amended Federal Energy Regulatory Commission (FERC) license.
Appendix 2 – Off-license Agreement – commitments by Denver Water and USFS related to Denver Water’s past, existing and future operations on USFS lands.
Clean Water Act, Section 401 Water Quality Certification
June 2016: The Colorado Department of Public Health and Environment issued the Section 401 Water Quality Certification for the Gross Reservoir Expansion Project that certifies – with the approved mitigation and enhancement measures – the project will create a “Net Environmental Benefit” on both the West and East slopes. This certification includes the following documents:
June 2016: U.S. Fish and Wildlife issued its Biological Opinion to implement measures to protect and preserve threatened and endangered species – including the Green Lineage Cutthroat Trout.
December 2013: U.S. Fish and Wildlife issued its Biological Opinion on impacts of depletions of Denver Water’s entire system (not just the Gross Reservoir Expansion Project).
National Historic Preservation Act, Section 106 Consultation
October 2015: Denver Water and the State Historic Preservation Officer reached a Programmatic Agreement following a consultation process to meet obligations set forth in the National Historic Preservation Act. Following what is known as a Section 106 Consultation, this agreement fosters cooperation between Denver Water, and state and federal agencies to identify and document historic features and sets a procedural framework to follow in the event historic features are discovered.
During construction, the volume of construction traffic will vary day-to-day and month-to-month, depending on the type and number of construction activities taking place.
There may be delays caused by slow-moving construction vehicles on Gross Dam Road and Colorado 72. Other roads, such as Colorado 93, Colorado 128, U.S. 287, Arapahoe Road (U.S. 287 bypass to County Line Road) and County Line Road may be affected depending on the location of the construction materials needed to be transported to the site.
Denver Water is looking into alternatives for reducing construction traffic delays, including constructing and/or improving turnouts on Colorado 72 for slow-moving traffic.
To assure we fully understand the potential impacts, on Aug. 8, 2013, Denver Water conducted a test by using loaded trucks to gauge noise and safety issues using third-party experts who have conducted many similar studies. Learn more by viewing the videos at the following links:
Denver Water operates a hydroelectric power plant at Gross Reservoir under a Federal Energy Regulatory Commission (FERC) hydropower license. To expand the reservoir, Denver Water needs to amend its existing hydropower license. Denver Water is required to provide information on the proposed changes at Gross Reservoir to stakeholders (e.g., relocation of recreation facilities, changes in hydropower generation, etc.), before submitting a final application to the FERC.
Please note that the draft application is a large document and it may take a long time to download.
TAP - October 2, 2019 - “It’s a fun job and also extremely important to the communities where these structures are built,” said Chris Thornton, director of the Colorado State University Hydraulics Laboratory. “Our job is to provide designers with information to make...
On Saturday, September 28 Denver Water hosted the fifth community cookout at the Gross Reservoir Expansion Project public information yurt. We enjoyed meeting new visitors to the yurt and were happy to see some returning guests to hear about the latest project...
Colorado Parks & Wildlife - Sept. 26, 2019 - "The fish will benefit, the anglers will benefit and this state wildlife area will become an even more attractive place to spend the day outdoors catching trout." Full press release available here.
To celebrate another great summer of outreach and relationship building, the Gross Reservoir Expansion Project team is hosting a community cookout on Saturday, Sept. 28, from 10 a.m. to 3 p.m. located at the public information yurt, just up the fill from our...
CSU College News - Sept. 24, 2019 - "CSU engineers are applying their hydraulics expertise to help verify key design and functionality aspects of the spillway, part of the public utility’s planned upgrade to Gross Dam. The reservoir impounded by Gross Dam provides...
TAP - September 19,2019 - "When the Gross Reservoir Expansion Project — which is in the final stages of approval after 15 years of permitting — is done, Denver Water will have more flexibility throughout its system to react to year-to-year changes in snowpack levels,...