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WSP04751
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Last modified
7/29/2009 10:28:41 PM
Creation date
10/12/2006 12:35:26 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8210.140.20.A
Description
Colorado River - Colo River Basin - Orgs/Entities - CRBSF - California - Colo River Board of Calif
State
CA
Date
8/13/2002
Author
Gerald Zimmerman
Title
Executive Directors Monthly Report to the Colorado River Board of California
Water Supply Pro - Doc Type
Report/Study
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<br />. <br /> <br />. <br /> <br />in the next iteration of the MSCP Conservation Plan. The Council was very supportive of the process, and <br />formally moved to continue full participation in the development of the LCR MSCP. Additionally, the <br />Tribe supported continuing the policy-level exchange of information, and continued coordination between <br />technical representatives of the LCR MSCP participants, the technical contractors, and the Tribe. <br /> <br />Glen Canyon Dam Adaptive Management Program <br /> <br />A meeting of the Glen Canyon Adaptive Management Work Group (AMWG) was held in Phoenix, <br />Arizona on July 17-18,2002. Both, Mr. Harris and I attended the meetings. At the meeting the U. S. <br />Geological Survey (USGS) briefed the AMWG regarding the proposed reorganization of the Grand <br />Canyon Monitoring and Research Center (GCMRC) within the USGS Western Region. The <br />reorganization, according to the USGS, will have the effect of bringing more of the USGS's resources to <br />bear on the adaptive management of the Glen Canyon Dam and the Grand Canyon's natural resources. <br /> <br />Reclamation provided an overview of the proposed Glen Canyon Dam experimental flow releases. <br />Generally, the concept involves careful monitoring ofthe sediments resources and inputs into the Glen and <br />Grand Canyon reaches of the Colorado River during the Summer and Fall months. If there is sufficient <br />sediment supply in the mainstream, flows from Glen Canyon Dam would be reduced to approximately <br />8,000 cubic-feet-per-second (cfs) to conserve the sediment in the chaJmel. In January 2003, the flows <br />would be significantly ramped up, to approximately 35,000 cfs or 40,000 cfs, and held at that rate for three <br />days. This would, in theory, mobilize the collected sediment and deposit it in the side channel eddies and <br />up on the beaches in the Grand Canyon. Implementation of the proposed experimental flows would alter <br />the monthly release volumes from Glen Canyon Darn, but should not affect the overall annual release <br />volume from Lakc Powell into Lake Mead. <br /> <br />The AMWG reviewed and discussed the proposed Fiscal Year 2004 budget for the Grand Canyon <br />Monitoring and Research Center and the overall Adaptive Management Program. AMWG members <br />requested additional information and clarification from representatives ofthe USGS, Reclamation, as well <br />as the GCMRC associated with specific budget line items. The requested budget for the GCMRC and <br />AMP was identified as $11,014,000 for FY-2004. The AMWG made a motion to recommend to the <br />Secretary of the Interior that the budget be forwarded through the Department for inclusion in the <br />President's budget. <br /> <br />Reclamation discussed the proposed construction and utilization of a selective withdrawal structure <br />on Glen Canyon Dam to warm the water released from Glen Canyon Dam. There was significant concern <br />that warming the releases will negatively impact the existing trout population at Lees Ferry, cause non- <br />native predator species to move up from Lake Mead and prey upon the small population of endangered <br />humpback chub near the confluence of the Colorado River mainstream and the Little Colorado River. <br />Additionally, there is concern that parasites, such as Asian tapeworm and the parasitic organism which <br />causes "whirling disease" in trout could become more prevalent below Glen Canyon Dam. Reclamation <br />and members of the Technical Work Group and AMWG will continue to evaluate the need for the <br />selective withdrawal structure. Representatives of the Lower Division States urged Reclamation to more <br />fully consult with representatives of the Nevada Division of Wildlife and the California Department of <br />Fish and Game. <br /> <br />10 <br />
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