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Last modified
8/11/2009 11:32:57 AM
Creation date
8/10/2009 4:18:50 PM
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UCREFRP
UCREFRP Catalog Number
7901
Author
Upper Colorado River Commission.
Title
Forty-Seventh Annual Report of the Upper Colorado River Commission.
USFW Year
1995.
USFW - Doc Type
Salt Lake City, Utah.
Copyright Material
NO
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<br />c. Fontenelle Reservoir <br /> <br />The Upper Green River Basin, after eight consecutive years of below- <br />normal flows, experienced an above-average year. The April through July <br />runoff into the reservoir during water year 1995 was 938,000 acre-feet, or <br />115 percent of the long-term average. Fontenelle easily filled in 1995. <br /> <br />Releases of up to 6,121 cfs were made in 1995. Peak inflow into <br />Fontenelle Reservoir was 11,400 cfs on June 19, 1995. Approximately <br />445,600 acre-feet of water bypassed the turbines in water year 1995. <br /> <br />Because the mean annual inflow of 1,200,000 acre-feet far exceeds the <br />storage capacity of 345,000 acre-feet, significant powerplant bypasses are <br />expected under the most probable and maximum probable inflow scenarios. <br />Additionally, there is little chance that the reservoir will not fill during water <br />year 1996. In order to minimize high spring releases and to maximize <br />downstream fishery resources and power production, the reservoir will <br />probably be drawn down to minimum pool elevation 6463 feet, which <br />corresponds to a volume of 93,000 acre-feet of live storage. <br /> <br />To meet the above-stated operation objectives, a constant release of <br />approximately 1,100 to 1,200 cfs will be made through the fall and winter <br />months. Releases at this level will provide an appropriate level of reservoir <br />drawdown for the 1996 runoff season while ensuring that downstream water <br />rights and M&I needs are met. The reservoir is expected to fill under the <br />most probable and maximum probable scenarios. <br /> <br />d. Navajo Reservoir <br /> <br />Actual inflow to Navajo Reservoir for water year 1995 was 1,503,000 <br />acre-feet, 157 percent of average. Peak inflow into Navajo Reservoir <br />occurred on June 18, 1995 at 10,700 cfs. The reservoir reached a peak <br />elevation of 6079.4 feet on July 28, 1995. The April through July inflow <br />into Navajo Reservoir in water year 1995 was 1,001,800 acre-feet, or 152 <br />percent of average. Navajo Reservoir filled in July 1995. <br /> <br />Section 7 consultation with the Fish and Wildlife Service on the operation <br />of Navajo Dam continued in 1995. Water year 1995 was the fifth year of a <br />7-year study to evaluate alternative operations of Navajo Reservoir to benefit <br />endangered fish. In accordance with this 7-year study, spring operations of <br />Navajo were modified in 1995, and large releases of up to 5,000 cfs were <br />made during much of May and June to coincide with the peak flows of the <br />Animas River to study the effect of large spring flows on the habitat improve- <br />ment and spawning success of endangered endemic species of fish. This <br /> <br />63 <br />
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