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<br />Flaming Gorge Reservoir
<br />(Green River)
<br />
<br />Water Vear 1984
<br />
<br />Fleming Gorge Reservoir started water yeof
<br />1984 at elevation 6,038 with an active
<br />storage of 3.676,000 acre.feet. This high
<br />level of storage was a result of the record
<br />high 1983 water year which was 200
<br />percent of normal. Releases from Flaming
<br />Gorge Dam for water year 1984 were
<br />projected to be higher thon normal due to
<br />the on-going repair work in the spillway
<br />tunnel and the unusually high fall inflows.
<br />It was planned that Flaming Gorge
<br />Reservoir would rise no higher thon
<br />elevation 6,035 feet in order to provide
<br />protection against having to use the
<br />spillway.
<br />
<br />Flaming Gorge Reservoir was gradually
<br />drawn down to near elevation 6,033 feet by
<br />January 1, 1984. The forecast of April
<br />through July runoff mode on January 6.
<br />1964. was. 1.935 maf or 168 percent of
<br />normal. This volume of runoff required
<br />maximum powerplant releases for the
<br />remainder of the year combined with
<br />releases through the river outlet works to
<br />limit the peak elevation to the planned
<br />6,035 feet. Subsequent runoff forecasts
<br />gradually declined to about 120 percent of
<br />normal by April 5, 1984, however, releases
<br />were maintained at the maximum
<br />powerplant capacity of about .4,000 cfs.
<br />"Flaming Gorge Reservoir was drown down
<br />to about elevation 6,022 feet by April 17,
<br />1984, and then further decreased to about
<br />elevation-6,021-on May" 13, -1984,-by-lising"o
<br />maximum river outlet works discharge of
<br />4,000 cfs in combination with maximum
<br />powerplant releases.
<br />
<br />The outlet works discharge was turned off
<br />on May 14, 1984, to allow access to the
<br />spillway tunnel outlet. The June 7. 1984.
<br />forecast of April through July runoff
<br />increased slightly from the May figure of
<br />125 percent of normal to 128 percent of
<br />normal. By this time, however, it was
<br />apparent that lake Powell would
<br />completely fill, and it was decided to utilize
<br />the remaining storage above 6,035 feet at
<br />Flaming Gorge to help limit Lake Powell's
<br />
<br />8
<br />
<br />
<br />Flaming Gorge Dam.
<br />
<br />rise. Releases from Flaming Gorge were
<br />subsequently reduced during June 1984,
<br />and Flaming Gorge Reservoir was brought
<br />to a nearly full condition. By mid-July the
<br />reservoir had essentially filled - to a peak
<br />elevation of 6,039 feet - and releases
<br />were then increased to maximum
<br />powerplant capacity to stop the rise of the
<br />water surface. A small discharge of 200
<br />ds was also initiated on July 10, 1984,
<br />through the river outlet works. Flows
<br />through the outlet works were limited to
<br />this amount to prevent washing out an
<br />access ramp to the spillway tunnel.
<br />Flaming Gorge Reservoir peaked at
<br />elevation 6,039.7 feet on August 6, 1984,
<br />and the-river.outlet-works-were gradually -
<br />turned off by August 13, 1984.
<br />
<br />The actual April through July unregulated
<br />runoff into Flaming Gorge Reservoir was
<br />1.64 maf or 143 percent of normal. The
<br />peak inflow during the runoff was 17.300
<br />ds on May 26, 1984. and the peak total
<br />discharge was 8,200 cfs on May 7, 1984.
<br />The total inflow for water year 1984 was
<br />2.60 maf or 157 percent of normal. The
<br />total release from Flaming Gorge during
<br />water year 1984 was 2.5 maf of which
<br />'" ,000 acre-feet bypassed the powerplont.
<br />The spillway was not used.
<br />
<br />Water Year 1985
<br />
<br />It is projected that the water surface at
<br />Flaming Gorge will be drawn down to near
<br />elevation 6,018 feet before the 1985 spring
<br />runoH. This drawdown will again facilitate
<br />filling Flaming Gorge Reservoir no higher
<br />than 6,035 feet during the 1985 runoff os
<br />the spillway repair work continues. The
<br />releases from Flaming Gorge will most
<br />probably be maintained near the maximum
<br />powerplant capacity of 4,C()O cfs during the
<br />majority of the year in order to achieve the
<br />drawdown necessary to contain the most
<br />probable volume of inflow below elevation
<br />6,035 feet.
<br />
<br />Flaming Gorge Active Storage.
<br />
<br />Chart 2
<br />
<br />Reservoir
<br />
<br />Acre.Feet
<br />
<br />EI. (Ft.)
<br />
<br />Maximum Storage
<br />Roted Heod
<br />Minimum Power
<br />Surfoce Areo (Full)
<br />Reservoir Length
<br />(Full)
<br />Powerplant
<br />Number of Units 3
<br />Total Capacity 108,000 Kilowatts
<br />'e>o.. not Include <10,000 ex..-I..I 01 deod .IOroge below 57.cO 1..1.
<br />
<br />3,749,000
<br />1,062,000
<br />233,000
<br />42,020 Acres
<br />
<br />60<10
<br />5946
<br />5871
<br />
<br />91 Miles
<br />
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