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<br />LOWER BASIN RESERVOIRS <br /> <br />LAKE MEAD <br />(COLORADO RIVER) <br /> <br /> <br />Water Year 1992 <br /> <br />At the beginning of water year 1992, Lake Mead, impounded <br />by Hoover Dam, had a water surface elevation of 1173 feet <br />and an active storage of 19,233,000 acre-feet. During the <br />winter months, the water level decreased below 1172 feet until <br />early December and rose above 1179 feet until the end of April <br />1992. The water level then declined reaching a low elevation <br />of 1173.4 feet in the third week of August, with an active <br />storage of 19,281,000 acre-feet. <br /> <br />During the water year, releases were made to meet <br />downstream water use requirements in the United States and <br />Mexico, programmed levels of Lake Mohave and Havasu, and <br />net transit losses which include river and reservoir <br />evaporation, uses by phreatophytes, changes in bank storage, <br />unmeasured inflows, and diversions to the Las'V egas, Nevada <br />area via the Robert B. Griffith Water Project. The total <br /> <br />ACTUAL RELEASES 1992 <br /> <br />THOU8AHD ACR!-oFf:eT <br />1200 <br /> <br /> / <br /> V \ <br /> /' <br />'--... / <br /> "- /' <br /> <br />1000 <br /> <br />... <br /> <br />soo <br /> <br />... <br /> <br />20. <br /> <br />. <br />~ ,l' Q"-c, .of ~,,-. +~ ~'t- +~ l' i''' I' ..(I <br /> <br />release from Lake Mead through Hoover Dam during the <br />water year 1992 was approximately 8,007,000 acre-feet. All of <br />the amount passed through the turbines for power <br />production. <br /> <br />In addition, 280,000 acre-feet were diverted from Lake Mead <br />by the Project. At the end of the water year, Lake Mead had <br />a water surface elevation of 1174.4 feet and an active storage <br />of 19,416,000 acre-feet which reflects an increase in storage <br />during the water year of 183,000 acre-feet. On September 30, <br />1992, the active storage of Lake Mead was 5,331,000 acre-feet <br />greater than the active storage in Lake Powell. <br /> <br />LAKE MEAD <br /> <br />Reservoir <br /> <br />Elevation, feet <br /> <br />Acre-feet <br /> <br />Storage Capacity <br />Rated Head <br />Minimum Power <br />Surface Area, full <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 />115 Miles <br /> <br />Power plant <br /> <br />Number of Units <br />Total Capacity <br /> <br />17 <br />1,964,500 KW <br /> <br />15 <br />