3. Land within the reservation lying above the lower dam, a part of which are now irrigated, could be served with flood water. 4. A large body of land outside of the reservation in the FlorenceCasa Grande district could be brought under cultivation. 5. The lands now irrigated both on the reservation and around Florence would be given permanent and adequate diversion facilities which at present they lack. RECOMMENDATIONS. It is recommended that— 1. That part of the San Carlos project involving the construction of the San Carlos dam and reservoir be deferred. 2. The two diversion dams across the Gila River described in this report, one above Florence and the second above Sacaton, with the necessary feeder canals, be constructed in the immediate future. 3. The title to the San Carlos reservoir site and as far as practicable the title to the other reservoir sites along the Gila and its tributaires be retained by the United States. 4. The investigations to determine the effect of the irrigation in the Duncan and Solomonville Valleys upon the flow of the Gila at and near the Gila River Reservation be continued. This is important to enable the Government to properly protect the water rights of the reservation and those of the project here recommended. 5. To provide for the construction of the diversion dams and main canals, $1,361,177 be appropriated to remain available until the completion of the work. Respectfully submitted. C. R. OLBERG, Superintendent of Irrigation. DECEMBER 1, 1915. Respectfully forwarded to the Commissioner of Indian Affairs. This the latest and most comprehensive report ever submitted on this subject. It will be of great use in discussing this matter in the future and will be the groundwork for any adjudication of the water rights on the river system and will be of great assistance in protecting the rights of the Indians. W. M. REED, CONTENTS. Page. Previously used canals_. History of irrigation on the Gila River Indian Reservation. Effects of upper diversions on water supply of Pimas. Old Woman's Mouth__ 109 109 109 116 117 118 120 120 121 121 122 123 123 124 124 125 126 126 127 128 129 129 129 130 130 132 History of irrigation on the Gila River Indian Reservation-Continued. Résumé of irrigation on the San Carlos Reservation. Comments on San Carlos irrigation__. |