USGS Water-Year Summary 2024

09502000 SALT RIVER BELOW STEWART MOUNTAIN DAM, AZ

LOCATION - Lat 33°33'10", long 111°34'33" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.6, T.2 N., R.8 E., Maricopa County, AZ, Hydrologic Unit 15060106, on left bank 3.5 mi downstream from Stewart Mountain Dam and 6 mi upstream from Verde River.(unsurveyed).

DRAINAGE AREA - 6,232 mi², of which 21 mi² are below Stewart Mountain Dam.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Mar. 1930 to current year. Monthly discharge only for some periods, published in WSP 1313. Published as "at Stewart Mountain Dam" 1934-41.

REVISED RECORDS - WSP 1343: Drainage area.

GAGE - Water-stage recorder. Elevation of gage is 1,370 ft above sea level, from topographic map. Prior to Sept. 27, 1934, at site 3.2 mi upstream at different datum. Sept. 27, 1934, to Jan. 20, 1950, at site 2.8 mi upstream at datum 1,396.33 ft above sea level.

REMARKS - Records good, except estimated daily disharge values, which are rated poor. Flow regulated by four reservoirs above station. Entire flow (except during infrequent periods of extreme flooding) is diverted at Granite Reef Dam, 10 mi downstream, for irrigation in Salt River Valley and for municipal use by the city of Phoenix.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 75,200 ft³/s Feb. 15, 1980, gage height, 25.0 ft, from highwater mark inside gage well, from rating curve then in use, extended above 10,000 ft³/s defined by known release rates from Stewart Mountain Dam and recorded gage heights; maximum daily discharge, 64,000 ft³/s Feb. 16, 1980; no flow at times in recent years.

AVERAGE DISCHARGE FOR PERIOD OF RECORD - 84 years, 947 ft³/s, 686,100 acre-ft/yr.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Dec. 1950 to Aug. 1992, Aug. 1999 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE:Oct. 1964 to Sept. 1982, Mar. 1983 to Sept. 1990. WATER TEMPERATURE:Dec. 1950 to Sept. 1982, Mar. 1983 to Sept. 1990.