USGS Water-Year Summary for Site 09471000

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

09471000 SAN PEDRO RIVER AT CHARLESTON, AZ

LOCATION - Lat 31°37'33.39", long 110°10'30.37" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 NE 1/4 sec.11, T.21 S., R.21 E., Cochise County, AZ, Hydrologic Unit 15050202, in Spanish land grant of San Juan de las Boquillas y Nogales, at downstream side of pier near center of highway bridge, 0.3 mi south of Charleston, 1.5 mi upstream from Charleston dam-site, and 9 mi upstream from Babocomari River.

DRAINAGE AREA - 1,234 mi². of which 696 mi² is in Mexico.

REVISIONS HISTORY - WSP 1119: 1939(M). WSP 1213: 1914, 1916(M), 1918(M), 1919, 1920(M), 1922-23(M), WDR AZ-90-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Jan. and Feb. 1904 (gage heights only); Mar. 1904 to Aug. 1906; Nov. 1910 to Dec. 1911 (gage heights only); Sept. 1912 to current year. Monthly discharge only Oct. 1926 to May 1928 and Dec. 1933 to Apr. 1935, published in WSP 1313. Published as "near Lewis Springs" 1910-11, and as "near Fairbank" 1911-26.

GAGE - Water-stage recorder. Datum of gage is 3,956.76 ft above NAVD of 1988. Prior to Nov. 16, 2022, datum of gage was reported as 3,954.01 ft above sea level. Prior to Dec. 1, 1942, nonrecording gage or water-stage recorder at various sites within 6.5 mi downstream at different datums.

REMARKS - Records good except for discharges higher than 350 ft³/s, which are fair. Estimated daily discharge are poor. Diversions above station, mostly by pumping from ground water, for irrigation of 3,200 acres in 1978, excluding an unknown amount in Mexico. Record shows flow available at Charleston dam-site.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, about 98,000 ft³/s Sept. 28, 1926, gage height, 21.9 ft, site and datum then in use, by slope-area measurement of peak flow; minimum daily discharge since 1928, no flow July 6-17, 2005.

WATER-QUALITY RECORDS

PERIOD OF RECORD - July 1963 to Sept. 1975, Dec. 1986 to Sept. 1993, Feb. 1996 to May 2005, Oct. 2007 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE:Oct. 1964 to Sept. 1975, Oct. 1996 to Sept. 1998. WATER TEMPERATURE:July 1963 to Sept. 1975, Oct. 1996 to Sept. 1998. SUSPENDED-SEDIMENT DISCHARGE:July 1963 to Sept. 1975.