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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
08128400 Middle Concho River above Tankersley, TX
LOCATION - Lat 31°25'38", long 100°42'39" referenced to North American Datum of 1927, Irion County, TX, Hydrologic Unit 12090103, on left bank 0.3 mi upstream from East Rocky Creek, 0.5 mi southwest of Tullos Ranch Headquarters, 6.7 mi northwest of Tankersley, and 20.9 mi upstream from mouth.
DRAINAGE AREA - 2,084 mi² of which 968 mi² probably is noncontributing.
REVISIONS HISTORY - WDR TX-81-3: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Mar. 1961 to Sept. 1995 (daily mean discharge), Oct. 1995 to Mar. 2001 (peak discharges greater than base discharge), Apr. 2001 to current year.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: Aug. 1964 to Apr. 1966.
BIOCHEMICAL DATA: Aug. 1964 to Apr. 1966.
GAGE - Water-stage recorder. Datum of gage is 1,986.70 ft. above NAVD88. Satellite telemeter at station.
COOPERATION - City of San Angelo, TX, and the U.S. Geological Survey, USGS.
REMARKS - No known regulation or diversions. No flow at times most years.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since 1900, 29.5 ft, Sept. 26, 1936. A flood in 1900 reached the same stage, from information by local resident.
