USGS Water-Year Summary 2024

09466500 GILA RIVER AT CALVA, AZ

LOCATION - Lat 33°11'08", long 110°13'10" referenced to North American Datum of 1927, in SW 1/4 sec.8, T.3 S., R.21 E., Graham County, AZ, Hydrologic Unit 15040005, in San Carlos Indian Reservation, on Arizona Eastern Railroad bridge at head of San Carlos Reservoir, 2 mi west of Calva.(unsurveyed).

DRAINAGE AREA - 11,470 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - Oct. 1929 to current year.

GAGE - Water-stage recorder. Datum of gage is 2,517.29 ft above sea level. Prior to Oct. 1, 1954, and Aug. 25, 1958, to Dec. 31, 1962, at datum 2.52 ft lower. Oct. 1, 1954, to Aug. 24, 1958, at datum 5.52 ft lower. Dec. 31, 1962, to Oct. 20, 1972, at site 530 ft downstream at datum 3.65 ft lower. Oct. 20, 1972, to Sept. 30, 1974, supplementary gage at bridge on U.S. Highway 70, 6.2 mi upstream at datum 2,560.19 ft, NGVD.

REMARKS - Records are good except for estimated discharge which are poor. Diversion above station for irrigation of about 69,000 acres, metallurgical treatment of ores, and municipal uses.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since at least 1914, probably in excess of 100,000 ft³/s, Jan. 20, 1916, determined on basis of peak discharge at stations near Solomon and at Kelvin.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 150,000 ft³/s, Oct. 3, 1983, gage height, 23.1 ft, from rating curve extended above 87,000 ft³/s on basis of area-velocity and flow-over-road computations of peak flow; minimum discharge, no flow at times.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Oct. 1974 to July 1994 and Aug. 1999 to June 2009 (discontinued).