USGS Water-Year Summary for Site 08128000

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	Available Parameters
	00060 Discharge(Mean,Max.,Min.)
	00065 Gage height(Mean)

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

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USGS Water-Year Summary 2024

08128000 South Concho River at Christoval, TX

LOCATION - Lat 31°11'13", long 100°30'06" referenced to North American Datum of 1927, Tom Green County, TX, Hydrologic Unit 12090102, on left upstream side of U.S. Highway 277 bridge, 9.5 mi upstream from Twin Buttes Dam, and 23.7 mi upstream from mouth.

DRAINAGE AREA - 413 mi² of which 59 mi² probably is noncontributing.

REVISIONS HISTORY - WSP 1118: 1943(M). WDR TX-81-3: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Feb. 1930 to Sept. 1995 (daily mean discharge), Oct. 1995 to Apr. 2001 (peak discharges greater than base discharge), May 2001 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Sept. 1964 to Aug. 1965, May 1971 to July 1971. BIOCHEMICAL DATA: Sept. 1964 to Aug. 1965, May 1971 to July 1971.

GAGE - Water-stage recorder and concrete control. Datum of gage is 2,010.82 ft. above NAVD88. Prior to Apr. 28, 2022 recording gage at same site and different datum (2010.22 ft. above NGVD29). Jul. 17, 1930, non-recording gage at same site and same NGVD29 datum. Water-stage recorder at same site and NGVD29 datum from Jul. 17, 1930, to Nov. 15, 1977, at site 160 ft. downstream at same NGVD29 datum from Nov. 16, 1977, to May 5, 1987. Satellite telemeter at station.

REMARKS - Flow is affected to an unknown degree by diversions to the South Concho Irrigation Company canal 800 ft upstream from station. Some records listed in the period of record may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since 1882, about 23 ft (from floodmark), Aug. 6, 1906 (discharge, 115,000 ft³/s), from rating curve extended above 15,100 ft³/s on basis of slope-area measurement of 80,100 ft³/s, from information by local residents.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 100,000 ft³/s July 23, 1938 (gage-height, 21.95 ft, from floodmarks), from rating curve extended above 9,000 ft³/s on basis of slope-area determination at gage-height, 20.5 ft; no flow Feb. 28 and Mar. 1, 1955.