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along the Colorado River mainstream can be developed with assurance of continued operation and economic success. The lands are productive and the market is good because of the proximity to the large population centers of southern California. On tributary streams the limited water supplies at lower elevations have restricted development except where groundwater is being pumped. The groundwater is being mined and the economic limit for pumping will be reached within the foreseeable future. It is essential that a new water supply be secured for reservations such as the Ak Chin, Gila River, Papago, and San Xavier. Approximately 46,500 acres on these reservations are entirely dependent on pumped groundwater and approximately 100,000 acres on the San Carlos Irrigation Project are partially dependent on pumping from groundwater. The Reservations on tributaries higher on watersheds of the Gila and Salt Rivers have adequate total sources of water but full use is not made of the water supplies because of physical conditions of the irrigation systems, or lack of storage capacity. The Bureau of Indian Affairs and Tribal Councils on these reservations plan to proceed energetically on programs for use of the waters on these reservations. Effects of Recent Supreme Court Decisions The Supreme Court Decision has established definitely the amount of water to which the Indian lands along the mainstream of the Colorado River are entitled. Although the tributary stream reservations were not included in the decision, the basic doctrine by which water rights are claimed for Indian reservations was reaffirmed. With this decision, plans can be made with confidence and development of the lands can proceed. 8Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,608,384 byte