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Lake Mathews is a large reservoir in Riverside County, California, located in the Cajalco Canyon in the foothills of the Temescal Mountains.〔 It is the western terminus for the Colorado River Aqueduct that provides much of the water used by the cities and water districts of the Metropolitan Water District of Southern California. The reservoir is fenced and closed to all public access. The lake is near the Riverside community of Lake Hills, and is skirted by Cajalco Road on the south, El Sobrante Road on the north and east, and La Sierra Avenue on the west. La Sierra Avenue traverses the top of the west dike. These roads are often used by commuters as a shortcut between Interstate 15 and Interstate 215 or California 91. The reservoir was constructed by building a large earthfill dam across the northern side of the basin. Two smaller dams, called dikes, were built during the 1961 expansion to increase the lake's capacity. ==History== Originally named the Cajalco Reservoir, the reservoir is now named after W.B. Mathews, an attorney who was a key architect of the MWD and its business relationships with member water agencies. Construction on the reservoir began in 1933, at the same time the aqueduct was being built across the desert. The reservoir site had previously been occupied chiefly by carob orchards and tin mines. Lawrence Holmes, Sr., who owned 1,100 acres in the future reservoir basin, lost his property to eminent domain in a lengthy court battle.〔( Kathleen Dever and Judy Whitson, Lake Mathews And Gavilan Hills, Arcadia Publishing, Charleston, 2007, pp.39-100 )〕 The dam across Cajalco Canyon and its intake structure were completed in 1939. The first water arrived from the Colorado River in February 1940, and water deliveries began in 1941. In 1961, the reservoir’s capacity was nearly doubled to its current capacity of 182,000 acre-feet. In the mid-2000s, a large project was undertaken to rehabilitate the old outlet tower and to construct a new tower as an alternate. The MWD was concerned about the tower’s susceptibility to earthquakes, and age had rendered many of the tower’s massive valves unusable. To allow for construction without impacting the water supply, a cofferdam was constructed.〔(MWD People Interactive Magazine, June 2002 )〕 Massive concrete tunnels were built to connect the new tower to the existing waterworks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lake Mathews」の詳細全文を読む スポンサード リンク
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