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WSP12932
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Last modified
1/26/2010 4:34:15 PM
Creation date
3/25/2008 4:15:40 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.40
Description
Colorado River AOP Status Report
Basin
Colorado Mainstem
Author
USDOI/BOR
Title
Colorado River Reservoir Operations Status Reports Partial Part 1 2004
Water Supply Pro - Doc Type
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<br />Currently, releases from Crystal are set at 700 cfs. The river flows below the tunnel are about 300 <br />cfs. Due to the severity of the continuing drought in the Gunnison River Basin, river flows through <br />the Black Canyon of the Gunnison have been set close to the minimum flow rate of 300 cfs since the <br />close of late season's (2003) irrigation. It is anticipated that canyon flows will start to increase as <br />downstream demands pick up, which should start to increase sometime during the first part of May. <br /> <br />The next meeting ofthe "Aspinall Unit Working Group" will be held on Thursday, April 22, 2004 <br />at 1 :00 PM in Grand Junction, Colorado. At this meeting, review oflast autumn and winter reservoir <br />operations, and plans for next spring and summer 2004 operations will be discussed. These <br />meetings are open forum discussions on the Aspinall Unit reservoir operations with many interested <br />groups participating. Anyone needing further information about these meetings should contact Dan <br />Crabtree in the Grand Junction Area Office at (970) 248-0652. <br /> <br />Navajo - Reclamation increased the release from Navajo Reservoir from 250 cubic feet per second <br />(cfs) to 350 cfs on Thursday, April 1, 2004, at 4:00 am. Releases are made for the authorized <br />purposes of the Navajo Unit, and to attempt to maintain a target base flow through the endangered <br />fish critical habitat reach of the San Juan River (Farmington to Lake Powell). <br /> <br />Once again this year, a shortage sharing agreement on the San Juan River has been developed by <br />water users. The agreement calls for users to limit their water use and share in shortages in the event <br />a water shortage is realized. <br /> <br />Minimum Target Base Flows for recovery of endangered fish will be 400 cfs through October based <br />on the 2004 Shortage Sharing Agreement recommendations that target base flows be reduced from <br />500 cfs to 400 cfs for the April through October period, ifthe Minimum Probable forecast projects <br />the July End-of-Month Content to be below 1,000,000 acre-feet. <br /> <br />Based on the 2004 Shortage Sharing rules, a shortage does not exist under the April forecast. <br /> <br />Because of gate repair work at Navajo Dam this spring, a spring peak release will not be made for <br />endangered fish this year. The minimum allowable reservoir release will be 350 cfs through October, <br />unless the Record of Decision (ROD) for the Navajo Reservoir EIS is signed before that time. <br /> <br />Unregulated reservoir inflow for March was 119,000 acre-feet, or 133 percent of average. This <br />unexpected above normal inflow was a direct result of much warmer temperatures than usual during <br />March, thus initiating an early start to the annual spring runoff. The current daily reservoir inflow is <br />averaging about 2,000 cfs. Presently, the reservoir water surface elevation is 6010.8 feet, which <br />corresponds to a storage content of about 829,000 acre-feet. The monthly precipitation average in <br />the basin above Bluff was only 20 percent of average for March. The basin wide snowpack on April <br />10 was 87 percent of normal for the Animas River basin, and 89 percent of normal for the upper San <br />Juan River basin. <br /> <br />On April 5, 2004, the National Weather Service's River Forecast Center issued an inflow forecast for <br />Navajo Reservoir for the April through July runoff period. This forecast is projecting a volume <br />runoffinto the reservoir of 600,000 acre-feet. This represents a 75 percent of normal runoff for the <br />Upper San Juan River Basin. <br />
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