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<br />Glen Cangon Dam
<br />lake Powell
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<br />Chart
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<br />STATISTICS
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<br />Loke Powell has been operated as part of the
<br />Colorado River Storage Project in accordance
<br />with compacts and laws to provide optimum
<br />power production, recreation, and fish and
<br />wildlife enhancemen t. One of the important
<br />functions of the reservoir is to provide water
<br />from storage to meet the delivery of 75,000,000
<br />acre-feet of watcr to the Lower Basin each 10
<br />years as required by the Colorado River
<br />Compact. A total of 8,558,000 acre-feet was
<br />i'eleased from Lake Powell during water year
<br />1971, with 8,574,000 acre-feel passing the
<br />Compact point 'It Lee Ferry, Arizona, Releases
<br />from Lake Powell during the year were
<br />scheduled so that Lake Mead remained at a
<br />near.constant level during the bass spawning
<br />season to provide good habitat for propagation,
<br />
<br />On September 30, 1970, Lake Powell had an
<br />elevation of 3,599 feet and an active storage of
<br />12,0 million acre.feet. The high water elevation
<br />occurred on July J 1, 1971, when the reservoir
<br />had 14,5 million acre-feet of active storage
<br />at elevation 3,622 feet. This is an all.time high
<br />for Lake Powell, being 52 feet above rated head
<br />with 58 percent of the active capacity of the reservoir.
<br />
<br />ACTIVE STORAGE.
<br />RESERI/OIR {ACRE.FEET! ELEVATION (FEET!
<br />MAX'MUM STORAGE 75,00'.000 3700 The April.July 1971 runoff above the gage at
<br />RATED HEAD 9,428,000 3570
<br />MINIMuM POWER 4,126.000 3490 Lees Ferry, Arizona, undepleted by CRSP
<br />SURFACE AREA (FULL) 161.J90ACRES reservoirs! was 8.4 million acre-feet or 101
<br />RESERVOIR LENGTH lFULLJ 186MILES percent of the 1906-68 average. On September
<br />POWER PLANT 30, 1971, the lake had receded 8 feet to elevation
<br />NUMBER OF UNITS 8
<br />TOTAL CAPACITY OF UNITS 900.000 KilOWATTS 3,614 feet and an active storage of 13.6 million
<br />'doesnorinclud~ ',998,OOOdcr~fenofdt!ildstordgeb~low3370f~r acre-feet (Chart 6)
<br />OUTFLOW
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<br />Water Year 1971
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<br />AVERAGE
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<br />12
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