USGS Water-Year Summary for Site 08195000

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	Available Parameters
	00060 Discharge(Mean,Max.,Min.,Med.)
	00065 Gage height(Mean,Med.)
	00095 Specific cond at 25C(Mean)
	99133 NO3+NO2,water,insitu(Med.)

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

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USGS Water-Year Summary 2024

08195000 Frio River at Concan, TX

LOCATION - Lat 29°29'18", long 99°42'16" referenced to North American Datum of 1927, Uvalde County, TX, Hydrologic Unit 12110106, on left bank 0.7 mi southeast of Concan Post Office, 15.0 mi upstream from Dry Frio River, and 222.8 mi upstream from mouth.

DRAINAGE AREA - 389 mi².

REVISIONS HISTORY - WSP 1512: 1926, 1931-32, 1934(M), 1935-36. WSP 1712: 1958. WSP 1923: 1954(M), 1957(M). WDR TX-83-3: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Oct. 1923 to Sept. 1929 (Monthly discharge only), Oct. 1930 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: June 1952, Apr. 1960, Dec. 1964 to June 1971, Jan. 1974 to Aug. 1993, Aug. 1995 to Sept. 2004. BIOCHEMICAL DATA: Apr. 1960, Dec. 1964 to Aug. 1993, Apr. 1995 to Sept 2004. BIOLOGICAL DATA: Aug. 1968 to June 1971, Jan. 1974 to Aug. 1993, Aug. 1995, Aug. 2003, Aug. 2004, Aug. 2006, July 2009. PESTICIDE DATA: Aug. 1968, Jan. 1974 to Aug. 1993, Nov. 2000 to Sept. 2006. SEDIMENT DATA: Aug. 1995, Apr. 1996 to Apr. 1998, Nov. 2000 to Sept. 2004. RADIOCHEMICAL DATA: Jan. 1981 to Apr. 1981, Aug. 1995 to Sept. 2004. STABLE ISOTOPE DATA: Aug. 1995 to Sept. 2004. PERIOD OF DAILY RECORD, Water-Quality.-- WATER TEMPERATURE: Nov. 1996 to Aug. 1998. DISSOLVED OXYGEN: Nov. 1996 to Aug. 1998.

GAGE - Water-stage recorder. Datum of gage is 1,203.71 ft above NGVD of 1929. Oct. 26, 1923, to July 28, 1924, nonrecording gage at site 86 ft upstream at datum 5.08 ft lower. July 29, 1924, to Oct. 3, 1930, nonrecording gage, and Oct. 4, 1930, to May 18, 1939, water-stage recorder, at site 130 ft downstream at present datum. Satellite telemeter at station.

REMARKS - No known regulation. Many small diversions for irrigation above station. No flow at times. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1869, that of July 1, 1932, from information by local residents.

WATER-QUALITY RECORDS

PERIOD OF RECORD - CHEMICAL DATA: June 1952, Apr. 1960, Dec. 1964 to June 1971, Jan. 1974 to Aug. 1993, Aug. 1995 to Sept. 2004, Mar. 2010 and present year. BIOCHEMICAL DATA: Apr. 1960, Dec. 1964 to Aug. 1993, Apr. 1995 to Sept 2004. BIOLOGICAL DATA: Aug. 1968 to June 1971, Jan. 1974 to Aug. 1993, Aug. 1995, Aug. 1996, Aug. 2003, Aug. 2004, Aug. 2006, Aug. 2008 to present year. PESTICIDE DATA: Aug. 1968, Jan. 1974 to Aug. 1993, Nov. 2000 to Sept. 2006. SEDIMENT DATA: Apr. 1996 to Apr. 1998, Nov. 2000 to Sept. 2004 and present year. RADIOCHEMICAL DATA: Jan. 1981 to Apr. 1981, Mar. 2010.

REMARKS - Water quality data was collected for the National Water Quality Assessment Program. 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 on flow conditions, minimum and maximum extremes may have occurred during period of missing record

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 641 micro siemens/cm, June 20, 2014; minimum, 189 micro siemens/cm, May 26, 2014. WATER TEMPERATURE: Maximum, 33.3°C, Sep. 24, 2023; minimum, 3.5°C, Feb 15, 2021.