<br />Lower Basin Reservoirs
<br />Lake Mead (Colorado River)
<br />
<br />
<br />Water Year 1985
<br />At the beginning of water year 1985, Lake
<br />Mead, impounded by Hoover Dam, had a
<br />waler surface elevalion of 1210 feet and
<br />an aclive storage of 24,412,000 acre.feel.
<br />During the winler and spring months, the
<br />water level gradually declined to 1206
<br />feel by the end of April 1985. DUring the
<br />high inflow conditions of June and July,
<br />LaKe Mead reached a high elevation ot
<br />1214.4 feet in the first week of July, with
<br />a peak active storage of 25,060,000 acre.
<br />feel.
<br />
<br />During Ihe water year, releases were
<br />made to meet downstream water use
<br />requirements in the United States and
<br />Mexico, flood control requirements,
<br />programed levels of Lakes Mohave and
<br />Havasu, and transit losses which include
<br />river and reservoir evaporation, uses by
<br />phreatophytes, changes in bank storage,
<br />unmeasured inflows, and diversions. The
<br />to\al release ham LaKe Mead through
<br />Hoover Dam during waler year 1985 was
<br />approximately 18,636,000 acre.feet. All of
<br />that amount passed through the turbines
<br />tor power production. At the end at the
<br />
<br />water year, Lake Mead had a water
<br />surface elevation of 1213 feet and an
<br />aclive storage of 24,875,000 acre.feet
<br />whictl reflects an increase in storage
<br />during the water year of 463,000 acre.
<br />feet. On September 30, 1985, the active
<br />storage in Lake Mead was 2,114,000
<br />acre.feet greater than the active storage
<br />in Lake Powefl.
<br />
<br />Water Year 1986
<br />Under most probable inflow conditions
<br />during the 1986 water year, the LaKe
<br />Mead water level is scheduled to be
<br />drawn down to elevation 1201 feet at the
<br />end of June 1986. At that level, the lake
<br />will have in active storage approximafely
<br />23.0 rnaf. During water year 1986, a total
<br />ot about 12.7 maf is scheduled to be
<br />released from Lake Mead under most
<br />probable conditions, all passing through
<br />the powerplanl.
<br />
<br />A contract was 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 slotled ring air.
<br />inducing devices in the inclined sections
<br />
<br />
<br />'W___"'__ "__.' _. -,___ ..._
<br />
<br />..J,oo"e' Dam
<br />
<br />6
<br />
<br />Of the spillway tunnels and the repair of
<br />tunnel concrete lining. Work on the
<br />Nevada spillway began in October 1 985
<br />and is scheduled to be completed by May
<br />15, 1986. The Arizona spillway work is
<br />scheduled to be completed in water year
<br />1987.
<br />
<br />Lake Mead Active Storage' Chart 6
<br />
<br />Rese rvoi r Acre.Feet EI. (ill
<br />Maximum Storage 27,377,000 1229
<br />Rated Head 13,653,000 1123
<br />Minimum Power 10,024,000 1083
<br />Surface Area
<br />(Full) 162,700 Acres
<br />Reservoir Length
<br />(Full) 115 Miles
<br />Powerplant
<br />Number of Units 17
<br />Total Capacity 1,429,000 Kilowatts
<br />'Doe~ no\ ,"elude 2::l18.0CQ acre.let!l ol dead Slor"ge belOw
<br />B951eel
<br />
<br />
<br />.. ~}i .,
<br />~;;;i.,.~:.
<br />High Scaling Geologists Gather Structural Dala at
<br />Hoover Dam
<br />
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