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<br />Lake Powell (Colorado River)
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<br />Glen Canyon Spillway operallng .
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<br />Water Year 1980
<br />During water year 1980, Lake Powell,
<br />which is impounded by Glen Canyon
<br />Dam, was operated as part of the Colo-
<br />rado River Storage Project in accordance
<br />with governing contracts and laws to pro-
<br />vide river regulation, optimum power pro.
<br />duction, recreation, and fIsh and wildlife
<br />enhancement.
<br />
<br />On September 30, 1979, Lake Powell
<br />water surface elevation was 3.678 feet
<br />with a live storage of 21 ,636,000 acre-
<br />tee\. The I'.pr;I-Jl.lly 19\10 !\.lnotl at lees
<br />Ferry, Adz" was 10,95\1,000 acre-Ieet,
<br />144 -percent'of thelong'time-average,'
<br />With this inflow, the reservoir filled to
<br />capacity lor the lirst time, On Jl.lne n,
<br />1980, Lake Powell exceeded elevation
<br />3,700 feet and Lake Mead was at eleva-
<br />tion 1,201, thus terminating Lake Powell
<br />filling criteria. Several days prior to the
<br />filling of Lake poweii, both left and right
<br />spillways were successfully tested with
<br />lIows up to 30,000 It' /s,
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<br />6
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<br />Lees Ferry
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<br />Water Year 1981
<br />By the end ot September 1980, the eleva-
<br />tion of Lake Powell was 3,68\1 feet. It is
<br />expected to be drawn down to about
<br />3,6i6 feet by spring of 19\11, With an
<br />average April-July inflow of appro"Kimatel'j
<br />8,000,000 acre-feet, a maximum elevation
<br />of 3,696 feel is expected, AI this eleva-
<br />tion, the content is 24.3 million acre-feet,
<br />97 percent of active capacity, and the
<br />surface area is approximately 158,000
<br />acres. Scheduled releases from Lake
<br />Powell under average conditions amount
<br />to 9,950,000 acre-Ieet, 1,720,000 acre-Ieet
<br />more than the minimum required by the
<br />ope rating-criteria. -Eq ual izatlo-n of -storage
<br />is anticipated during September 1981, If
<br />lhe inllow \0 laKe Poweli is at the lower
<br />quartile or less, the release will be
<br />8.230,000 acre-Ieet. With an upper quar-
<br />tile inflow, the release is projected to be
<br />11,031,000 acre-teet.
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<br />Lake Powell Active Storage"
<br />Reservoir (Acre-Feet)
<br />
<br />Maximum Storage
<br />Rated Head
<br />Minimum Power
<br />Smlace Area (Full)
<br />Reservoir Length
<br />(Full)
<br />Power Pi ant
<br />
<br />Number 01 Units
<br />Totai Capacity
<br />
<br />Chart 5
<br />
<br />EI.
<br />(Ft.)
<br />
<br />25,002,000 3700
<br />9.428,000 3570
<br />4,126,000 3490
<br />161,390 Acres
<br />
<br />186 Miles
<br />
<br />'does r'IOllnctude 1,998.000 acre.leet of dead
<br />storage balow 3370 fel!lt
<br />
<br />8
<br />900,000 Kilowatts
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