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Effects of Arizona-California Boundary Settlement Settlement of the Arizona-California boundary location will not have a great effect on Indian lands, since the areas of Indian Reservation lands involved in adjustment of the boundary location are small. Effects of Public Land Use and Disposition Very little of the public land in the lower Colorado River basin is used by Indians, as their activities generally are confined to their reservations or in cities and towns. The disposition of public lands, therefore, will have little effect on Indian affairs. Future Water Needs The principal future water needs on Indian Reservations along the mainstream will be for full development of 136,636 acres of irrigated lands for which the Supreme Court has allocated water. Accompanying this expansion will be a moderate expansion of municipal, industrial, and recreational needs. The future needs of the reservations on tributaries will include municipal and industrial uses required as the urban areas of Phoenix and Tucson expand on nearby reservations and as industrial developments are made on the other reservations. Additional agricultural use of water will primarily before augmenting existing supplies, or replacement of water now being pumped from groundwater. Use of water for recreational purposes is important economically but the quantities of water involved are relatively small. PRESENT WATER SUPPLIES AND USES Lower Colorado River Main Stream Water Water Use Projects (See accompanying tabulation entitled "Present Water Use Projects (Water Supplies and Uses on Indian Reservations." Present uses of water of the mainstream of the Lower Colorado River on Indian Reservations are at the Colorado River, Yuma, and Cocopah 9Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,239,744 byte