Gross Reservoir Expansion Project
Final Federal Energy Regulatory Commission (FERC) Hydropower License Amendment Application
May 2017: We responded to public comments received by FERC during their 60-day comment period. Those responses can be found here.
April 2017: We provided FERC with details about our consultation with the U.S. Forest Service regarding changes to our Recreational Management Plan.
March 2017: We responded to FERC’s February 2017 request for more information with this letter.
November 2016: Denver Water filed our final license amendment application with the FERC. Multiple Documents and Volumes available here:
U.S. Army Corps of Engineers 404 Permit and Record of Decision
U.S. Forest Service Agreement
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 (CDPHE) 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:
Endangered Species Act, Section 7 Consultation
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.
2015 Availability Sessions
FIsh and Wildlife Mitigation & Enhancement Plans
June 2011: Denver Water developed the Fish and Wildlife Mitigation Plan and Fish and Wildlife Enhancement Plan pursuant to C.R.S. Section 37-60-122.2, approved by Colorado Parks and Wildlife and the Colorado Wildlife Commission, and affirmed by the Colorado Water Conservation Board as the official state position on the mitigation actions required of Denver Water for fish and wildlife resources.
2008 Public Meetings
Construction Traffic Documents
- Noise Vibration Analysis
- Map – Gross Reservoir Sound Vibration Monitors
- Map – Proposed Gross Reservoir Haul Route
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:
Passing Slow-Moving Vehicles
Intersection of Highway 72 and Gross Dam Road
Draft FERC Hydropower License Amendment Application
DRAFT FERC Hydropower License Amendment Application
- 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.
Copies of the draft FERC hydropower license amendment application are also available for public review at:
- Denver Water Administrative Building (1600 West 12th Ave., Denver, Colorado, 80204) — hard copy
- Local libraries — hard copy:
- Grand County:
- Denver County:
- Central Library, 10 W. Fourteenth Ave. Pkwy., Denver, CO 80204
- Boulder County:
- Main Library, 1001 Arapahoe Avenue, Boulder, CO 80302
- Jefferson County:
- Summit County:
- Denver Water will provide an electronic copy on CD of the draft FERC hydropower license amendment application, if requested.
Environmental Impact Statement
Click here to visit the Moffat EIS Page on the Army Corps of Engineers’ Website.
FERC Amendment - Initial Consultation Document
Letters to Gross Reservoir Neighbors
Governor Endorses Gross Reservoir Expansion Project
Latest News / Blog
The trees removed from the expanded reservoir may have a new life as “biochar,” improving soil for plants. Denver Water TAP - Expanding a reservoir has a lot of challenges, among them dealing with the trees and bushes that must be removed. Leaving this biomass in...
With the sun drifting ever lower in the sky and the brilliant colors of fall a pleasant memory, the 2018 season for the Gross Reservoir Expansion’s Public Information Yurt has come to a successful finish. It was a great year marked by constructive two-way...