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title image: Glen Canyon Dam Long-Term Experimental Plan

 

The Long-Term Experimental Plan Environmental Impact Statement (LTEP EIS) was begun in late 2006 to address flow and non-flow actions in the Colorado River below Glen Canyon Dam. The Bureau of Reclamation completed public scoping for the proposed action in January 2007 and issued a scoping report in March 2007. Multiple factors, including extraordinarily large sediment inputs from tributaries, new information on the endangered humpback chub population, and litigation, have led to a temporary suspension of work on the LTEP EIS, and instead a primary focus on Endangered Species Act and National Environmental Policy Act compliance on a five-year plan of experimental flows, including a high-flow test that was completed in early March 2008.

During the ESA/NEPA compliance efforts, the Bureau of Reclamation published a Federal Register Notice on February 12, 2008, advising the public that there was a need to reassess the need for and approach to the LTEP EIS following completion of compliance on the five-year experimental flow program. That reassessment has not yet been completed, but when it is finished the public will be notified and this web site will be updated to identify the decision.

Cooperating Agencies
Under the provisions of NEPA, a total of 16 entities have been identified as Cooperating Agencies to participate in the EIS development process. Cooperating Agency List

 

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The proposed federal action is to develop and adopt a long-term experimental plan that will implement a structured, long-term program of experimentation (including dam operations, modifications to Glen Canyon Dam intake structures, and other non-flow management actions, such as removal of non-native fish species) in the Colorado River below Glen Canyon Dam.

The purpose of the proposed action is to increase scientific understanding of the ecosystem downstream from Glen Canyon Dam and to improve and protect important downstream resources. Specific hypotheses to be addressed include the effect of dam release temperatures; ramp rates; non-native control; and the timing, duration, and magnitude of BHBF releases. Adoption of a long-term experimental plan is needed to ensure a continued, structured application of adaptive management 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, consistent with applicable federal law. Adoption of a long-term experimental plan will assist scientists, policy makers, and resource managers to better understand resource management options, tradeoffs and consequences, and assist in the long-term operations of Glen Canyon Dam.

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News Releases


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Federal Register Notices


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Letters


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Public Meetings

  • December 5 - 6, 2006: Tempe, Arizona, Fiesta Inn Resort (Encantada Ballroom), 2100 South Priest Drive.
    Meeting times: Dec. 5:  9:30 a.m. - 5:00 p.m. , Dec. 6:  8:00 a.m. - 3:00 p.m.
  • January 4, 2007: Phoenix, Arizona, Embassy Suites Phoenix Airport at 44th Street (Cholla room), 1515 North 44th Street. Meeting time: 6:00 p.m. - 8:00 p.m.
  • January 5, 2007: Salt Lake City, Utah, Hilton Salt Lake City Center, (Salon 1), 255 South West Temple.
    Meeting time: 6:00 p.m. - 8:00 p.m.

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Public Involvement

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EIS Schedule

  • December 12, 2006 - February 28, 2007: Formal scoping period
  • March 2007: Issue scoping report
  • April 2008: Publish draft environmental impact statement
  • October 2008: Publish final environmental impact statement
  • December 2008: Issue record of decision

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Related Documents and Information

The Long-Term Experimental Plan Environmental Impact Statement will build on a decade of scientific experimentation and monitoring that has taken place as part of the Glen Canyon Dam Adaptive Management Program (AMP), and will build on the knowledge gained by experiments, operations, and management actions taken under the AMP. Accordingly, the Department of the Interior intends to tier from earlier National Environmental Policy Act compliance documents such as those prepared as part of the Department's Glen Canyon Dam AMP efforts.


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Adaptive Management Program


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Last updated: June 30, 2011