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USGS Water-Year Summary 2024
09469000 SAN CARLOS RESERVOIR AT COOLIDGE DAM, AZ
LOCATION - Lat 33°10'32", long 110°31'38" referenced to North American Datum of 1927, in NW 1/4 sec.17, T.3 S., R.18 E., Gila County, AZ, Hydrologic Unit 15040005, in San Carlos Indian Reservation, at right intake tower of Coolidge Dam on Gila River. (unsurveyed).
DRAINAGE AREA - 12,886 mi².
REVISIONS HISTORY - WSP 1049: 1929, 1934, 1937-38. WSP 1283: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Nov. 1928 to current year.
GAGE - Water-stage recorder. Datum of gage is 2,539.54 ft above sea level. Prior to Jan. 15, 1937, series of stakes with tops at known elevations for reference points on right bank about 1,000 ft upstream from dam. Jan. 15, 1937, to Dec. 31, 1947, water-stage recorder at present site at datum 0.72 ft lower.
COOPERATION - Bureau of Indian Affairs personnel who operate Coolidge Dam.
REMARKS - Records good. Reservoir is formed by concrete multiple-dome dam. Dam completed Oct. 25, 1928; storage began Nov. 15, 1928. Reservoir is used to store water for irrigation of San Carlos project and for power development, dependent on irrigation demands. In 1997 laws were passed that prohibited water users from using storage below 29,559 acre-ft. Spill over Coolidge Dam because of capacity storage has occurred Apr. 22 to May 5, 1979, Feb. 24 to Mar. 13, 1980, Oct. 4-23, 28-31, Dec. 3-13, 1983, Jan. 2 to June 5, 1985, Jan. 11 to Mar. 18, 1993.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,090,000 acre-ft Feb. 26 to Mar. 6, 1980; maximum elevation observed, 2,521.36 ft Jan. 20, 1993; no usable contents at times.
