- Reclamation
- Upper Colorado Region
- Glen Canyon Dam Adaptive Management Program
Glen Canyon Dam
Adaptive Management Program
The Glen Canyon Dam Adaptive Management Program was developed to provide an organization and process for cooperative integration of dam operations, downstream resource protection and management, and monitoring and research information, as well as to improve the values for which the Glen Canyon National Recreation Area and Grand Canyon National Park were established.
Adaptive management is a dynamic process where people of many talents and disciplines come together to make the right decision in the best interests of the resources.
Current Focus
Glen Canyon Dam/Smallmouth Bass Future Flow Options and High-Flow Experimental Protocol
The Bureau of Reclamation today released the Glen Canyon Dam Long-Term Experimental and Management Plan (LTEMP) Final Supplemental Environmental Impact Statement (SEIS) Link is to a PDF file that analyzes various flow options from Glen Canyon Dam to help disrupt the establishment of nonnative fish, primarily smallmouth bass, below the dam in the Colorado River.
The document supplements the LTEMP Final Environmental Impact Statement (FEIS) and Record of Decision Link is to a PDF file. Glen Canyon Dam impounds Lake Powell, the largest storage unit of the Colorado River Storage Project.
Purpose and Need
The purpose of the LTEMP SEIS is for Reclamation to analyze additional flow options at Glen Canyon Dam in response to nonnative, invasive smallmouth bass and other warmwater nonnative species recently detected directly below the dam. The detection in 2022 and 2023 of a larger numbers of young of year smallmouth bass suggests spawning is occurring directly below the dam. The need for the LTEMP SEIS is to disrupt the establishment of smallmouth bass below Glen Canyon Dam by limiting additional recruitment, which could threaten populations of threatened humpback chub (Gila cypha) below the dam.
The LTEMP SEIS purpose relative to High Flow Experiment (HFE) releases is to consider adjusting sediment accounting periods and HFE implementation windows. The need is to include the latest scientific information to improve Reclamation's ability to implement HFE releases as detailed in the 2016 LTEMP FEIS.
Preferred Alternative
Reclamation identified the Cool Mix option as the Preferred Alternative in the Final LTEMP SEIS. The actual selection of an alternative for implementation will not occur until the Record of Decision is signed.
Public Involvement
The Final LTEMP SEIS will be published in the Federal Register on Friday, May 31, 2024. This will initiate a 30-day period before a Record of Decision can be signed.
Please contact the LTEMP SEIS Project Manager at LTEMPSEIS@usbr.gov for more information.
Public comment letters received about the Draft LTEMP SEIS
Tribes
Governments
- Arizona Electric Power Link is to a PDF file
- Arizona Game and Fish Department Link is to a PDF file
- Central Arizona Project Link is to a PDF file
- City of Logan, Utah Link is to a PDF file
- City of Manti, Utah Link is to a PDF file
- City of Nephi, Utah Link is to a PDF file
- City of Price, Utah Link is to a PDF file
- City of Provo, Utah Link is to a PDF file
- City of Salem, Utah Link is to a PDF file
- City of Spanish Fork, Utah Link is to a PDF file
- City of St George, Utah Link is to a PDF file
- Electrical District Number Seven Link is to a PDF file
- Heber Light and Power Link is to a PDF file
- Maricopa Water District Link is to a PDF file
- National Park Service Link is to a PDF file
- Navajo Tribal Utility Authority Link is to a PDF file
- Roosevelt Irrigation District Link is to a PDF file
- Salt River Project Link is to a PDF file
- Town of Levan, Utah Link is to a PDF file
- Town of Oak City, Utah Link is to a PDF file
- United States Environmental Protection Agency Region 9 Link is to a PDF file
- United States Fish and Wildlife Service Link is to a PDF file
- Upper Colorado River Commission Link is to a PDF file
- Utah Municipal Power Agency Link is to a PDF file
- Washington City Power Link is to a PDF file
- Western Area Power Administration Link is to a PDF file
- Wyoming Municipal Power Agency Link is to a PDF file
Organizations
- American Whitewater Link is to a PDF file
- Arizona Public Power Associations Link is to a PDF file
- BlueRibbon Coalition Link is to a PDF file
- Center for Biological Diversity Link is to a PDF file
- Colorado River Basin States Adaptive Management Work Group Representatives Link is to a PDF file
- Colorado River Commission of Nevada Link is to a PDF file
- Colorado River Energy Distributors Association Link is to a PDF file
- Glen Canyon Dam Adaptive Management Work Group Recreational Fishing Representatives Link is to a PDF file
- Grand Canyon River Guides Link is to a PDF file
- Grand Canyon River Outfitters Association Link is to a PDF file
- Grand Canyon Trust Link is to a PDF file
- Grand Canyon Wildlands Council Link is to a PDF file
- National Parks Conservation Association Link is to a PDF file
- Upper Division States Adaptive Management Work Group Representatives Link is to a PDF file
- Utah Associated Municipal Power Systems Link is to a PDF file
- Wyoming, Nebraska, Utah, Colorado, Arizona, and New Mexico Representatives of Electric Cooperatives Link is to a PDF file
Next Steps
A Final SEIS with Record of Decision, as appropriate, is anticipated to be available in July 2024.
- Modeling the Impacts of Glen Canyon Dam Operations on Colorado River Resources Link is to a PDF file
Program Background
![Lees Ferry Colorado River at Lees Ferry](images/LeesFerry.gif)
Since Glen Canyon Dam was completed in 1963, increasing concern was expressed by the public and federal and state agencies regarding how dam operations may be adversely affecting the downstream environment. To begin addressing these growing concerns, in December 1982, the Bureau of Reclamation initiated the multi-agency interdisciplinary Glen Canyon Dam Environmental Studies at the direction of the Secretary of the Interior.
In November 1989, the Secretary directed an Environmental Impact Statement be prepared on the operation of Glen Canyon Dam, and the Secretary designated Reclamation as the lead agency. This Final EIS, completed in March 1995, received broad and intense interest from water and power users, environmental and conservation groups, Federal and State agencies, Indian tribes, and private citizens across the country.
Findings from the EIS indicated that many uncertainties still exist regarding the downstream impact of water releases from Glen Canyon Dam. The EIS team consolidated the issues of public concern, identifying the significant resources and associated issues to be analyzed in detail. These resources include: water, sediment, fish, vegetation, wildlife and habitat, endangered and other special status species, cultural resources, air quality, recreation, hydropower, and non-use value.
In compliance with the Grand Canyon Protection Act of 1992 (Public Law 102-575), the EIS proposed a process of "adaptive management" whereby the effects of dam operations on downstream resources would be monitored and assessed.
The Act, and the EIS are the guiding documents for development of the Adaptive Management Program. The program meets the purpose and strengthens the intent for which the EIS was prepared, and ensures the primary mandate of the Act is met through future advances in information and resource management.
Section 1802 of the Act directed the Secretary to establish and implement long-term monitoring programs and activities to ensure the Glen Canyon Dam is operated "... in such a manner as to protect, mitigate adverse impacts to, and improve the values for which Grand Canyon National Park and Glen Canyon National Recreation Area were established, including, but not limited to natural and cultural resources and visitor use."
In order to comply with the consultation requirement of the Act, Section 1805 of the Act, the EIS recommended formation of a federal advisory committee. The Transition Work Group was formed to operate until such time as a federal advisory committee could be formed, and a Record of Decision signed by the Secretary of the Interior to initiate a process of "management" (operating criteria for unbiased scientific research and data collection) whereby the effects of dam operations on downstream resources would be assessed. Meetings were held with representatives from the cooperating agencies and public interest groups who provided comments on the criteria for development of reasonable alternatives for the EIS.
The transition group worked on a variety of issues including a long-term monitoring and research program to ensure Glen Canyon Dam is operated in a manner consistent with protecting the downstream environment as well as implementation and management of operations and monitoring in consultation with broad-based interests.
The Record of Decision was signed by the Secretary of Interior in October 1996, and in January 1997, Interior Secretary Babbitt signed a Notice of Establishment of the Glen Canyon Adaptive Management Work Group, a federal advisory committee. The charter of this group was signed on January 15, 1997.
All of the elements are now in place for an effective, credible adaptive management effort. The Adaptive Management Work Group is the key; the Technical Work Group providing detailed guidance on issues and objectives; the Science Center to conduct the research and monitoring needed to evaluate operations; and the independent review panel, the outside review necessary to provide the credible science.
The AMWG continues public involvement in the decision-making process and incorporates those stakeholders with interest in the operation of Glen Canyon Dam and downstream resources. By blending the best science and management practices, the AMWG makes recommendations to the Secretary on how to protect the resources and meet the requirement of the law.
The Adaptive Management Program is administered through a senior Department of the Interior official — designee — and facilitated through the AMWG, which is organized as a federal advisory committee and chaired by the designee.
The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group as a subgroup to work on tasks charged to them by the AMWG.
Back to Quick Nav![Colorado River](images/GrandCanyon.gif)
Contact us
Bureau of Reclamation
William (Bill) Stewart
125 South State Street, Room 8100
Salt Lake City, Utah 84138-1147
wstewart@usbr.gov
Grand Canyon Monitoring & Research Center
Serena Mankiller
2255 North Gemini Drive
Flagstaff, Arizona 86001
928-556-7094
Fax: 928-556-7092
smankiller@usgs.gov
Related Documents
Current Focus
- GT Max Model Review Panel Final Report Link is to a PDF file
- GT Max Model Review Panel Workshop Participant Comments Link is to a PDF file
- GT Max Expert Review Panel Response to Comments Link is to a PDF file
- Adapitive Management Work Group Charter Link is to a PDF file - Sept. 2023
- Memorandums and Review - Desired Future Conditions Link is to a PDF file
- Adapitive Management Work Group Operating Procedures Link is to a PDF file
- Technical Work Group Operating Procedures Link is to a PDF file
Law of the River
- Colorado River Compact
- Boulder Canyon Project Act
- California Seven Party Agreement
- Mexican Water Treaty
- Upper Colorado River Basin Compact
- Colorado River Storage Project Act
- Arizona v. California et al.
- Colorado River Basin Project Act
- Criteria For Coordinated Long-Range Operation of Colorado River Reservoirs
- Minute 242 of the U.S. - Mexico International Boundary and Water Commission of 1973
- Colorado River Basin Salinity Control Act
Reports to Congress on Glen Canyon Dam operations
Can be found on our Reports page in the new Document Library.
Reports and Recomendations to the Secretary of the Interior
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