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OJ2019 nn ~'" .ASSEI\'IBLY INTERIJ'VL CO!vEvHTTEE ON "YATER. The Colorado River Aqueduct This 242-mile-long aqueduct leads from Parker Dam to Lake Mathews in Riverside County. It serves the Metropolitan Water District of Southern California, formed in 1928, and the City of San Diego and the San Diego County Water Authority (a member of the Metropolitan Water District since 1946) through the San Diego Aqueduct, all of which aqueduct service area is located outside the drainage area of the Colorado River but within the "Compact Basin." The Colorado River Aqueduct was financed, and is owned and operated, by the Metropolitan Water District. First uscd in 1941, it was recently com- pleted to its maximum capacity of 1,212,000 acre-feet a year. In 1962, 1,073,410 acre-feet were delivered through the aqueduct. TRIBUTARIES The Gila Proiect This project also originates at the Imperial Dam. The Gila Gravity Canal, with a capacity of 2,200 c.f.s., extends southward from Imperial Dam to serve three separate areas through branch eanals. The total area capable of service is l03,000 aeres. First authorized in 1937, this project was reauthorized in1947. San Carlos Proiect This is a joint project by the U.S. Bureau of Indian Affairs and others and serves about 100,000 acres on both sides of the Gila River in Arizona southeast of Phoenix and the Salt River Project. The proj- ect includes Coolidge and Ashurst-Hayden Dams on the Gila River. Coolidge Dam has a capacity of 1,285,000 acre-feet while Ashurst- Hayden is a diversion dam. For the 20-year period ending in 1955, annual surface diversions of the project were 187,000 acre-feet. The Salt River Project This project has a capability of serving about 240,000 acres and is located in Central Arizona along tbe Salt River east of its confluence with the Gila River. The project, which includes the City of Phoenix, was built by the Bureau of Reclamation and is now owned and oper- ated by the Salt River Valley Water Users' Association. It includes the Granite Reef Diversion Dam. Stewart Mountain Dam, Horse Mesa Dam, Mormon Flat Dam and Roosevelt Dam on the Salt River; Bart- lett Dam and Horseshoe Dam on the Verde River, and a flood control dam on Cave Creek. The Las Vegas Valley The Las Vegas Valley, including more than 200,000 acres, receives water pumped from Lake Mead behind Hoover Dam. In 1963 a total of 26,442 acre-feet was utilized from this source, for Boulder City and Henderson, Nevada.