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<br />LOWER BASIN RESERVOIRS <br /> <br />LAKE MEAD <br />(COWRADO RIVER) <br /> <br /> <br />Water Year 1991 <br /> <br />Al the beginning of""ler year 1991, Lake Mead, impounded <br />by Hoo"'-r Dam, had a ""tcr surface elevalion of 1 180 feel <br />and an active storage of 20)144,{K)() acre-feet. During the <br />winter monlhs, the ""ter le",1 gradually declined to about <br />1178 by early January, and rose 10 about 1180 feet by the end <br />of March 1991 and Ihen gradually declined to 1176 feet near <br />Ihe cnd of May 1991. During the period June through <br />September, Lake Mead continued to drop. reaching 3 Jow <br />elevation of about 1173feet during Ihc last week of September, <br />v.;th a corresponding active storage of 18,694,800 acre-feet. <br /> <br />During the water year. releases wc-ce made to meet <br />dO\\oTlstream water use requirements in the U niled States and <br />Mexico, programmed levels of Lake Mohave and Havasu, and <br />nct transit losses which include river and reservoir <br />evaporation, uses by phreatophytes, changes in bank storage, <br />unmeasured inflows, and diversions to the Las Vegas. Nevada <br /> <br />ACTUAL RELEASES 1991 <br /> <br />THOUSAND ACRE-FEET <br />1200 <br /> <br />I I / ~D <br /> t- "'- <br /> / <br />i"--. / "- ,......... <br /> <br />1000 <br /> <br />"'0 <br /> <br />.00 <br /> <br />'00 <br /> <br />200 <br /> <br />o <br />ONDJFMAMJJAS <br /> <br />area ,;a the Robert B. Griffith Water Project (Project). The <br />total release from Lake Mead through Hoover Dam during <br />the ""teryear 1991 wasapproximately8,961,OOOacre-fect. All <br />of the amount passed through the turbines for power <br />production. <br /> <br />In addition, 267,()(X) acre-fee-t were diverted from Lake ~1ead <br />by the Project. At the end of the water year, Lake Mead had <br />a water surface elevation of 1173 feet and an active of <br />19.233,000 acre-feet which reflects a decrease in slorage <br />during the ""ter year of911,000 acre-feet. On September 30, <br />1990, the active storage of Lake Mead was 4,534.000 acre-feel <br />greater than the aCli\e storage in Lake Powell. <br /> <br />LAKE MEAD <br /> <br />Reservoir <br /> <br />Elevation, feet <br /> <br />Acre-feet <br /> <br />Storage Capacity <br />Raled Head <br />Minimum Power <br />Surface Area, fu II <br />Reservoir 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 />115Miles <br /> <br />Powerplanl <br /> <br />Number ofUnils <br />Total Capacity <br /> <br />17 <br />1,952,500KW <br /> <br />15 <br />