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<br />LOWER BASIN RESERVOIRS
<br />
<br />LAKE MEAD
<br />(COLORADO RIVER)
<br />
<br />
<br />Water Year 1987
<br />
<br />Attbe beginning of water year 1987, Lake Mead, impounded
<br />by Hoover Dam, bad a water surface elevation of 1,209 feet
<br />and an active storage of 24,220,000 acre-feel. During tbe
<br />winter months, tbe water level gradually rose to 1,211 feet near
<br />the middle of February 1987, By the end of May tbe water level
<br />had gradually declined to elevation 1206 feel. During the high
<br />ioflowconditions of June and July, Lake Mead reacbed a high
<br />elevation of 1,208 feet in the last week of July, with a active
<br />storage of 24,066,000 acre-feel.
<br />
<br />During tbe water year, releases were made to meet
<br />downstream waler use requirements in the United States and
<br />Mexico, llood control requirements, programmed levcls of
<br />Lakes Mobave and Havasu, and transit losses which include
<br />
<br />ACI1JAL RELEASES
<br />1000 OF.
<br />..
<br />
<br />WY 1987
<br />
<br />..
<br />
<br />
<br />II
<br />
<br />to
<br />
<br />"
<br />
<br />'0
<br />
<br />o
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<br />ONDJFMAMJJASO
<br />
<br />river and reservoir evaporation, uses by phreatopbytes,
<br />cbanges in bank storage, unmeasured inflows, and diversions
<br />to tbe Las Vegas, Nevada area via the Robert B, Griffitb
<br />Water Project (Project), The total release from Lake Mead
<br />through Hoover Dam during water year 1987 was 13,140,000
<br />acre-feel. All of that amount passed througb tbe turbines for
<br />power production, In addition, 180,000 acre-feet were
<br />diverted from Lake Mead by the Projecl. At the end of tbe
<br />water year, Lake Mead bad a water surface elevation of 1,210
<br />feet and an active storage of 24,365,000 acre-feel whicb
<br />rellects an increase in storage during the water year of 145,000
<br />acre-feet, On Septembcr 30, 1987, the active storage of Lake
<br />Mead was 1,255,000 acre-feet greater than the active storage
<br />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 />Reservoir Lengtb, full
<br />
<br />27,377,000
<br />13,653,000
<br />10,024,000
<br />
<br />1,229
<br />1,123
<br />1,083
<br />162,700 Acres
<br />18 Milcs
<br />
<br />Powerplant
<br />
<br />Number of Units
<br />Total Capacity
<br />
<br />17
<br />1,429,000 KW
<br />
<br />15
<br />
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