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<br />LOWER BASIN RESERVOIRS <br /> <br />LAKE MEAD <br />(COLORADO RIVER) <br /> <br /> <br />Water Year 1990 <br /> <br />Atthe beginning of water year 1990, Lake Mead, impounded <br />by Hoover Dam, had a \1Iatcr surface elc\'ation of 1190 feet <br />and an active storage of 21,543,000 acre-feet. During the <br />\\1nter months, the water level gradually rose to about 1192 <br />feet during the early part of March 1990 and then gradually <br />declined to 1184 feet near the end of May 1990. During June, <br />July and August, Lake Mead continued to drop, reaching a <br />low elcv.ltion of about 1179 feet during the last week of <br />August, with a corresponding active storage of 19,986.0<X> <br />acre-feet. <br /> <br />During the water year, releases were made to meet <br />dO\'ffistream water use requirements in the United States and <br />Mexico, programmed levels of Lakes Mohavc and Havasu, <br />and net transit losses which include river and reservoir <br /> <br />ACTUAL RELEASES 1990 <br /> <br />THOUSAND ACRE-FEET <br />1200 <br /> <br /> '-- <br /> /1 \ <br /> / \ <br />......... <br /> <br />1000 <br /> <br />BOO <br /> <br />'00 <br /> <br />400 <br /> <br />200 <br /> <br />o <br />oNDJFMAMJJAS <br /> <br />evaporation, uses by phreatophytcs, changes in bank storage, <br />unmeasured int10VlS, and diversions to the Las Vegas, Nevada <br />area via the Robert B. Griffith Water Project (Project). The <br />total release from Lake Mead through Hoo",r Dam during <br />water year 1990 was approximately 9,322,000 acre.feet. A 11 of <br />the amount passed through the turbines for power <br />production. <br /> <br />In addition, 267.00CJ acre-feet were diverted. from Lake :Mead <br />by the Project. Atlhe end of the water year, Lake Mead had <br />a water surface elevation of 1180 feet and an active storage of <br />20,144,(X)() acre~feet which reflects a decrease in storage <br />during the water year of 1,374,000 acre-feet. On September <br />30, 1990, the acti", storage of Lake Mead was 3,891,000 <br />acre-feet greater than the acthe storage in Lake Powell. <br /> <br />LAKE MEAD <br /> <br />Reservoir <br /> <br />Acre-feet <br /> <br />Elevation, feet <br /> <br />Maximum Storage <br />Rated Head <br />Minimum Power <br />Surface Area, full <br />Reser",ir Length, full <br /> <br />27,377,000 <br />13,653,000 <br />10,024,000 <br /> <br />1229 <br />1123 <br />1083 <br />162,700 Acres <br />115 Miles <br /> <br />Powcrplant <br /> <br />Number of Units <br />Total Capacity <br /> <br />17 <br />1,944,000 KW <br /> <br />15 <br />