USGS Water-Year Summary for Site 08136500

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

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

08136500 Concho River at Paint Rock, TX

LOCATION - Lat 31°30'57", long 99°55'09" referenced to North American Datum of 1927, Concho County, TX, Hydrologic Unit 12090105, near left bank at downstream end of pier of bridge on U.S. Highway 83, 0.5 mi north of Concho County Courthouse in Paint Rock, 2.7 mi downstream from Kickapoo Creek, and 20.0 mi upstream from mouth.

DRAINAGE AREA - 6,574 mi² of which 1,131 mi² probably is noncontributing.

REVISIONS HISTORY - WSP 458: 1915-16. WSP 568: 1919-20. WSP 1712: 1922(M). WSP 1732: 1918(M), 1923(M). WDR TX-81-3: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Oct. 1915 to current year. Prior to Oct. 1970, published as "near Paint Rock". PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Mar. 1964 to June 2003. BIOCHEMICAL DATA: Mar. 1964 to June 2003. PESTICIDE DATA: Apr. 1968 to Oct. 1981. RADIOCHEMICAL DATA: Jan. 1981 to June 2003. SEDIMENT DATA: May 1978 to Sept. 1980. PERIOD OF DAILY RECORD, Water-Quality.-- SPECIFIC CONDUCTANCE: Feb. 2001 to Oct. 26, 2011. WATER TEMPERATURE: Feb. 2001 to Oct. 26, 2011.

GAGE - Water-stage recorder and concrete control. Datum of gage is 1,574.58 ft. above NAVD88. Prior to Sept. 20, 2022, Datum of gage published as 1574.36 ft. above NGVD29. See WSP 1922 for history of changes prior to Jan. 15, 1940. Satellite telemeter at station.

REMARKS - Since water year 1931, at least 10% of contributing drainage area has been regulated. Flow affected at times by discharge from the flood-detention pools of two floodwater-retarding structures. These structures control runoff from 16.5 mi² in the Willow Creek drainage basin. No flow at times. Some records listed in the period of record may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood in Aug. 1882 reached a stage of about 39.9 ft, and flood in Aug. 1906 reached a stage of 39.5 ft, from information by local resident.

EXTREMES FOR PERIOD OF RECORD - Maximum stage since regulation 43.4 ft. Sept. 17, 1936 (from floodmark). Maximum peak flow since regulation 301,000 ft³/s on Sept. 17, 1936 (From slope-area measurement); no flow at times.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1916-1930: Maximum discharge, 76,500 ft³/s, Apr. 27, 1922, gage height, 27.50 ft; no flow at times.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 15 years (water years 1916-30) prior to construction of Lake Nasworthy, 186 ft³/s (134,700 acre-ft/yr).

WATER-QUALITY RECORDS

PERIOD OF RECORD - CHEMICAL DATA: Mar. 1964 to June 2003. BIOCHEMICAL DATA: Mar. 1964 to June 2003. PESTICIDE DATA: Apr. 1968 to Oct. 1981. RADIOCHEMICAL DATA: Jan. 1981 to June 2003. SEDIMENT DATA: May 1978 to Sept. 1980.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Feb. 2001 to Oct. 26, 2011. (discontinued) WATER TEMPERATURE: Feb. 2001 to Oct. 26, 2011. (discontinued)

INSTRUMENTATION - A continuous two parameter water-quality instrument from Feb. 6, 2001 to Oct. 26, 2012.

REMARKS - Specific conductance record is rated good. Temperature record is rated excellent. Interruptions or periods of missing record may be due to instrument failure, no flow conditions or data corrections exceeding allowable criteria, which were deleted. Other than no flow conditions, minimum and maximum extremes may have occurred during period of missing record. Some records listed in the period of record may not be available electronically.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum daily, 4,180 microsiemens/cm, Aug. 14, 2011; minimum, 257 microsiemens/cm, Nov. 17, 2004. WATER TEMPERATURE: Maximum daily, 35.6, on Aug. 1, 2, 2004; minimum daily, 0.0°C, on many days during winter months. SEDIMENT CONCENTRATION: Maximum daily mean, 4,190 mg/L, Sept. 9, 1980; minimum daily mean, 3 mg/L, Feb. 2, 1979. SEDIMENT LOADS: Maximum daily, 269,000 tons Sept. 9, 1980; minimum daily, 0.0 tons on several days during Sept. 1980.