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Lower Colorado River Tributary Areas Water Use Irrigation Present use of water for irrigation is made on 18 reservations on tributaries of the lower Colorado River. These reservations and their uses of water are shown in the accompanying tabulation entitled: "Present Water Supply and Uses on Indian Reservations". Southern California Water Use Southern California Indian areas may be divided into two groups, those in the inland basin and those in the coastal region. In the inland basin are six reservations. In the coastal area are nine reservations. Their use of water is shown in the tabulation entitled "Present Water Supplies and Uses on Indian Reservations". FUTURE WATER DEMANDS AND SUPPLIES Water Demands The future demand for water on Indian Reservations along the mainstream will be principally for agricultural purposes. The principal future water needs on Indian Reservations along the mainstream will be for full development of 136,636 acres of irrigated lands. Accompanying this expansion will be a moderate expansion of municipal, industrial, and recreational needs. On the reservations on tributaries, the future needs will include municipal and industrial uses as the urban areas of Phoenix and Tucson expand to reservation areas. Agricultural use of water principally will be for augmenting existing supplies, or replacement of water now being pumped from wells. Use of water for recreational purposes is important economically but the quantities of water involved are relatively small. 11Epson Perfection 4870 Photo, 400 dpi, 8 bit, 13,953,024 byte