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<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 />