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<br />002557 <br /> <br />Water Use--There are six <br />of the Lower Colorado River. <br />are summarized for the period <br /> <br />major diversions from the <br />These measured diversions <br />of 1958-62 On table 6. <br /> <br />mainstream <br />and uses <br /> <br />1. Lake Mead Diversions--Diversions from Lake Mead to <br />Boulder City and the Las Vegas-Henderson area began in 1936 and <br />1942, respectively. <br /> <br />2. Colorado River Aqueduct--Diversion began in 1941 for <br />service to the Metropolitan Water District of Southern California. <br /> <br />3. Colorado River Indian Reservation Canal--During the <br />period 1870-1942, diversions in this vicinity were made by gravity <br />and pumping. Since 1942 all diversions have been made at Headgate <br />Rock Dam. The present service area is the Colorado River Indian <br />Reservation in Arizona. <br /> <br />4. Palo-Verde Canal--The Palo-Verde Irrigation District in <br />California formed in 1925 succeeded earlier diverters. <br /> <br />5. Gila Gravity Main Canal--Diversion began in 1943. The <br />service area includes the Yuma Mesa and the Wellton-Mohawk <br />Division of the Gila Project, and Yuma Auxiliary Division of the <br />Yuma Project~ Arizonao <br /> <br />6. All-American Canal--Diversion began in 1940. Service <br />area includes Yuma, Coachella, and Imperial Valleys, California. <br />Diversions from the All-American Canal through the Yuma Main <br />Canal serve the Valley Division of the Yuma Project, Arizona, and <br />the city of Yuma. Returns to the Colorado River through Pilot <br />Knob Wasteway also serve Mexico. <br /> <br />Unmeasured beneficial uses of water along the mainstream of <br />the Colorado River include the Willow Beach National Fish Hatchery, <br />Havasu and Imperial Wildlife Refuges, Lake Mead Recreational Area, <br />Parker-Davis Project, Cocopah Indian Reservation in Arizona, and <br />unauthorized diversions. <br /> <br />Reservoir and Channel Losses--Numerous studies have been <br />conducted to determine the channel losses along the Colorado River. <br /> <br />Gross evaporation losses along the mainstream vary from 60 <br />to over 86 inches annually. Theestimated annual net evaporation <br />of the mainstream reservoirs for the period 1957-1961 are: Lake <br />Mead - 834,000 acre-feet; Lake Mohave - 175,000 acre-feet; Lake <br />Havasu - 160,000 acre-feet; Head Gate Rock Reservoir - 2,000 acre- <br />feet; and Imperial and Laguna Reservoirs - 34,000 acre-feet. <br /> <br />111-2 <br />