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<br />Lower Belsln Reservoirs
<br />Lake Mead (Colorado River)
<br />
<br />
<br />lake Mead trun,e bOOt.
<br />
<br />Water Year 1984
<br />
<br />At the beginning of water year 1984. lake
<br />Mead. impounded by Hoover Dam, had a
<br />water surface elevation of 1.218 feet and
<br />an active storage of 25.658,000 acre.ieet.
<br />During the winter and spring months. the
<br />water level gradually declined to 1.206 feet
<br />by t~e end of April 1984. During t~e ~ig~
<br />inflow conditions of June and July, lake
<br />Mead reached a high elevation of 1,213.7
<br />feet near the erld of July, with 0 peak
<br />active storage of 24,962.000 acre-feet.
<br />
<br />During the water year, releases were made
<br />to m~et c;ioY'f'nstreom water use
<br />~equjrements in the United States and
<br />Mexico, flood control requirements,
<br />programed levels of lakes Mohave and
<br />Havasu. and trorlsit losses which include
<br />river and reservoir evaporation, uses by
<br />phreatophytes, changes in bank storage,
<br />unmeasured inflows, and diversions. The
<br />total release from lake Mead through
<br />Hoover Dam during water year 1984 was
<br />approximately 22,210,000 acre.feet. All of
<br />that amount passed through the turbines
<br />for power production. At the end of the
<br />water year, Lake Mead had a water
<br />surface elevation of 1,210 feet and an
<br />active storage of 24,406,000 acre.feet which
<br />reflects a decrease in storage during the
<br />
<br />16
<br />
<br />
<br />Hoover Dam and alterbay.
<br />
<br />water year of 1,252,000 acre-feet. On
<br />September 30, 1984, the active storage of
<br />Lake Mead was 57,000 acre.feet greater
<br />than the active storage in lake Powell.
<br />
<br />Water ., ear 1985
<br />
<br />Under most probable inflow conditions
<br />during the 1985 water year, the lake Mead
<br />water level is scheduled to be drciwn down
<br />to elevation 1,202 feet at the end of July
<br />1985. At that level, the lake will have in
<br />active storage about 23.2 million acre.feet.
<br />During water year 1985, a total of about
<br />14.6 million acre.feet is scheduled to be
<br />released :from-lake Mead under most
<br />p.robable conditions, all passing through the
<br />powerplant.
<br />
<br />A contract will be awarded in Water Year
<br />1985 for modification and repair work in
<br />both the Nevada and Arizona spillway
<br />tunnels at Hoover Dam. The work will
<br />consist of construction of slotted ring air.
<br />inducing devices in the inclined sections of
<br />the spillway tunnels and the repair of
<br />tunnel concrete lining. Work on the
<br />Nevada spillway is expected to begin in
<br />October 1985 and will be completed by May
<br />1986. The Arizona spillway work is
<br />scheduled to be completed in Water
<br />Year J987.
<br />
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<br />
<br />Lake Mead Active Storage'"
<br />
<br />Chart 6
<br />
<br />Reservoir
<br />
<br />Acre.Feet
<br />
<br />EI. (Ft.)
<br />
<br />Maximum Storage 27,3n,octJ 1229
<br />Rated Head 13.653.000 1123
<br />Minimum Power 10,024,octJ 1083
<br />Surlace Area (Full) 162.700 Acres
<br />Reservoir length
<br />(Full)
<br />Powerplant
<br />Number of Units
<br />Total Capacity
<br />
<br />115 Miles
<br />
<br />17
<br />1,344,800 Kilowatts
<br />
<br />'Doel no. .nclud. 2.376.000 ocr..'M' 01 d.,:,d Ilorag. belOw 89'
<br />,..I.
<br />
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