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now being irrigated. Water made available to non-Indian lands can be used only on lands having a recent irrigation history. The Central Arizona Project must withstand shortages up to its full allocation if there is insufficient main stream water to satisfy an annual consumptive use of 7.5 million acre-feet allocated under the Supreme Court Decree of March 1964 to the states of Nevada, Arizona, and California. When shortages occur, diversions to the ~ Central Arizona Project will be limited to assure prior water users of their ~ entitled diversions from the Colorado River main stream water. A maximum of 00 2.2 million acre-feet of Colorado River water is all tha~ could be diverted U) with a canal capacity of 3,000 cubic feet per second (ft Is). h. Colorado River Indian Reservation The Colorado River Indian Reservation is located along the Colorado River, just below Parker Dam, with most of the land in Arizona and the remainder in California. The Supreme Court Decree allocated 717,148 acre-feet of diversions to the Colorado River Indian Reservation for irrigation of 107,588 acres of land. There are 99,375 acres of land in Arizona, of which about 76,000 acres have been developed. The consumptive use requirement for irrigation of these lands is estimated to be 4 acre-feet per acre which would result in an annual mainstream depletion of 397,500 acre-feet. The Bureau of Indian Affairs has reported a general 2,000-acre- per-year land development rate on the reservation in the past. The land development rate of 2,000 acres per year was assumed for the future even though the Bureau of Indian Affairs feels the land development rate may slow down in the near future. i. Cibola Wildlife Refuge The Cibola Wildlife Refuge has a water right reserved by Secretarial notice in the Federal Register, December 9, 1982, for 16,973 acre-feet of consumptive use per year. In 1984, the refuge used 5,400 acre-feet. By 1990 it is projected to be fully developed. J. ,...! , - --- - -! - . . UJ.J.C1 .l:"LUJ~(';L The Gila Project was originally authorized to develop up to 600,000 acre-feet of consumptive use. It is now estimated that the acreage likely to be developed will consume about 450,000 acre-feet per year. The Gila Project includes the welton-Mohawk and Yuma Mesa Divisions. The Welton-Mohawk Division, which is now authorized to develop 65,000 acres, is anticipated to consume 300,000 acre-feet. The North Gila, Yuma Mesa, and Yuma (South Gila) Irrigation Districts are included under the Yuma Mesa Division of the Gila Project. A total of 37,500 acres is estimated to be the average acreage developed by the districts within this division. Consumptive use would average 150,000 acre-feet per year. VI-23