<br />FLAMING GORGE RESERVOIR
<br />(GREEN RIVER)
<br />
<br />
<br />Water Year 1989
<br />
<br />As a result of several extremely dry years in the Green River
<br />Basin, Flaming Gorge Reservoir has been drawn down about
<br />20 feet from full capacity, Releases during most of water year
<br />1989 were restricted to minimum flows of about 800 ds,
<br />
<br />Flaming Gorge Reservoir started water year 1989 at elevation
<br />6023.4 feet with an active storage of 3,098,000 acre-feet.
<br />Releases from Flaming Gorge Dam for water year 1989 were
<br />projected to, be 840,000 acre-feet for the most probable
<br />operating plan based on the October forecast of an
<br />unregulated inflow of 1.35 maf.
<br />
<br />Flaming Gorge Reservoir was gradually drawn down to
<br />elevation 6019.5 feet by January 1, 1989. The forecast of April
<br />through July runoff made on January 1, 1989. was 1.02maf or
<br />88 percent of the long-term average, Powerplant releases for
<br />January and February averaged 1,000 ds, On March 1, 1989,
<br />the April through July forecast had decreased to 980,000
<br />acre-feet, or 77 percent of average, Thc main spring runoff
<br />occurred during the middle of May with powerplant releases
<br />held at about 1,000 ds, Releases for June averaged about 1,300
<br />cfs and then were decreased to 850 dsfor July. Forthe months
<br />of August and September, releases were increased to an
<br />
<br />ACTUAL RELEASES
<br />
<br />WY 1989
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<br />
<br />average daily flow of 1,200 ds, Flaming Gorge reached a
<br />maximum elevation of 6019,66 on May 30 with a storage of
<br />approximately 2,96 maf. or 84 percent of reservoir capacity,
<br />
<br />Specific releases for research and data collection for studies
<br />concerning endangered fish survival requirements were
<br />provided in 1989, Releases from Flaming Gorge Dam have
<br />been limited to a maximum of 2,600 ds during the months of
<br />August and September to test the effect of releases on
<br />endangered Colorado Squawfish, This species is currently
<br />being studied as part of the Recovery Implementation
<br />Program in the Upper Colorado River Basin and the
<br />restricted summer flows are thought to enhance the
<br />downstream habitat of the fish,
<br />
<br />The actual April through July unregulated runoff into Flaming
<br />Gorge Reservoir was 589,000 acre-feet or 48 percent of
<br />average, The peak inflow was 2.735 ds, occurring on April 15,
<br />The total unregulated inflow for water year 1989 was 903,000
<br />acre-feet, or 60 percent of the long-term average. Total
<br />releases for the water year were 712,000 acre-feet, aU of which
<br />passed through the powerplant. The spillway was not used.
<br />
<br />FLAMING GORGE RESERVOIR
<br />
<br />ResetVoir
<br />
<br />Acre-feet
<br />
<br />Elevation, feet
<br />
<br />Maximum Storage
<br />Rated Head
<br />Minimum Power
<br />Surface Area, full
<br />Reservoir Length, full
<br />
<br />3,749,000
<br />1,062,000
<br />233,000
<br />
<br />6,040
<br />5,946
<br />5,871
<br />42,020 Acres
<br />91 Miles
<br />
<br />Powerplant
<br />
<br />Number of Units
<br />Total Capacity
<br />
<br />3
<br />lO8,OOO KW
<br />
<br />7
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