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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3680 <br /> <br />COLORADO RIVER INDIAN RESERVATION UNIT - ARIZONA <br /> <br />The Colorado River Indian Reservation is located in the <br />lower Colorado River Basin below Parker Dam in northern Yuma <br />County, Arizona, and the eastern part of San Der.nardino and <br />Riverside Counties in California. It has a total of 268,850 <br />acres of land with 107,588 of this total being designated as <br />irrigable. The United States Supreme Court allocated a maxi- <br />mum diversion of 717,148 acre-fect. In 1978, 75,405 acres were <br />irrigated with Colorado River water from Headgate Park Dam. <br />This area is served by 200 miles of canals and 100 miles of <br />drainage canals. <br /> <br />A salinity control study was conducted on this area to <br />determine its effect on the river's salinity. The analysis <br />of the inflow and outflow indicated that there was no net <br />salt contribution to the river. Co~sequently, the investi- <br />gation was terminated and the concluding report was released <br />in October, 1979. Monitoring will continue. <br /> <br />(updated 11/23/81) <br /> <br />DS:cs <br /> <br />-13- <br />