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USGS Water-Year Summary 2024
08134000 North Concho River near Carlsbad, TX
LOCATION - Lat 31°35'33", long 100°38'12" referenced to North American Datum of 1927, Tom Green County, TX, Hydrologic Unit 12090104, on left bank at downstream side of bridge on county road, 0.6 mi southeast of Carlsbad, 1.5 mi upstream from Mule Creek, 2.5 mi upstream from Grape Creek, 16.2 mi upstream from O.C. Fisher Dam, and 21.3 mi upstream from mouth.
DRAINAGE AREA - 1,266 mi² of which 75 mi² probably is noncontributing.
REVISIONS HISTORY - WSP 1512: 1924(M), 1925, 1926(M), 1928, 1930, 1932(M), 1935, 1937-38(M), 1941(M), 1945(M), 1947-49(M). WDR TX-81-3: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Apr. 1924 to current year.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: May 1963 to July 1982.
BIOCHEMICAL DATA: May 1963 to July 1982.
RADIOCHEMICAL DATA: Apr. to May 1981.
GAGE - Water-stage recorder. Datum of gage is 1,968.43ft above NAVD88 as determined by GNSS survey. Prior to September 15, 2023, datum of gage was 1,968.02ft above NGVD of 1929. Prior to Feb. 4, 1925, and Sept. 27, 1936, to Feb. 7, 1937, nonrecording gage; Feb. 4, 1925, to Sept. 26, 1936, and Feb. 8, 1937, to Nov. 6, 1955, water-stage recorder, all at site 2.5 mi upstream at datum 32.76ft higher. Satellite telemeter at station.
COOPERATION - The U.S. Geological Survey (USGS).
REMARKS - No known regulation. There are several diversions (by pumping) upstream from station. No flow at times.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since June 1853, that of Sept. 26, 1936.
EXTREMES FOR PERIOD OF RECORD - Maximium peak flow: Sept. 26, 1936; 94,600 ft³/s, from slope-area measurement of peak flow at former site. Maximum peak stage: Sept. 26, 1936; 29.10 ft, from floodmark at present site.
