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9 DESCRIPTION OF BASIN o W 1-' Lake Mead provides most of the storage and regulation in the Lower 00 Colorado River Basin with the water being stored for irrigation and municipal and industrial uses, generation of electrical power, and other beneficial uses. Lake Mohave, the reservoir formed by Davis Dam, backs water at high stages about 67 miles upstream to the tailrace of Hoover Powerplant. Storage in Lake Mohave is used for some reregulation of releases from Hoover Dam, for meeting treaty requirements with Mexico, and for devel- oping power head for the production of electrical energy at Davis Power- plant. The river flows through a natural channel for about 10 miles below Davis Dam, at which point the river enters the broad Mohave Valley 33 miles above the upper end of Lake Havasu. Lake Havasu backs up behind Parker Dam for about 45 miles and cov- ers about 25,000 acres. A forebay was constructed in Lake Havasu from which the Metropolitan Water District of Southern California pumps water into the Colorado River Aqueduct. Lake Havasu also controls floods orig- inating below Davis Dam. Headgate Rock Dam, Palo Verde Diversion Dam, and Imperial Dam all serve as diversion structures with practically no storage. Imperial Dam, located some 150 miles downstream from Parker Dam, is the major diver- sion structure to irrigation projects in the Imperial Valley and Yuma areas. It,diverts water on the right bank to the All-American Canal which delivers water to the Yuma project in Arizona and California and Imperial and Coachella Valleys in California. It diverts on the left bank t? the Gila Gravity Main Canal. The newly constructed Senator Wash Dam also affords regulation in the vicinity of Imperial Dam and assists in the delivery of water to Mexico.