USGS Water-Year Summary for Site 08181480

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	Available Parameters
	00045 Precipitation(Sum)
	00060 Discharge(Mean,Max.,Min.)
	00065 Gage height(Max.,Min.,Mean)

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

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USGS Water-Year Summary 2024

08181480 Leon Creek at Interstate Highway 35, San Antonio, TX

LOCATION - Lat 29°19'47", long 98°35'02" referenced to North American Datum of 1927, Bexar County, TX, Hydrologic Unit 12100302, on left bank between bridges on Interstate Highway 35 in San Antonio, 1.7 mi northeast of the intersection of Interstate Highway 35 and Loop 410, and 11.8 mi upstream from mouth.

DRAINAGE AREA - 219 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - Sept. 1984 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Aug. 1984 to Aug. 2009. BIOCHEMICAL DATA: Aug. 1984 to Aug. 2009. BIOLOGICAL DATA: Dec. 1992 to Dec. 1997. PESTICIDE DATA: July 1984 to Aug. 2009. SEDIMENT DATA: Aug. 1995 to Aug. 2007. PERIOD OF DAILY RECORD, Water-Quality.-- SPECIFIC CONDUCTANCE: Oct. 1985 to Sept. 2000, Feb. 2005 to Oct. 2007. pH: Apr. 1989 to Sept. 2000, Feb. 2005 to Oct. 2007. WATER TEMPERATURE: Oct. 1985 to Sept. 2000, Feb. 2005 to Oct. 2007. DISSOLVED OXYGEN: Apr. 1989 to Sept. 2000, Feb. 2005 to Oct. 2007.

GAGE - Water-stage recorder. Datum of gage is 574.255 ft. above NADV88. Prior datum of gage was 573.49 ft above NGVD of 1929. Satellite telemeter at station.

REMARKS - No known regulation or diversions. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - Oct. 2010 to current year.

INSTRUMENTATION - Unshielded, standard 8-in. diameter, tipping-bucket raingage, mounted above the top of the gage shelter 12 ft. above land surface, with satellite telemeter. Datum of gage is 573.49 ft above NGVD of 1929.

WATER-QUALITY RECORDS

PERIOD OF RECORD - SEDIMENT DATA: Mar. 2007 to Aug. 2007.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Oct. 1985 to Sept. 2000, Feb. 2005 to Sept. 2007. pH: Apr. 1989 to Sept. 2000, Feb. 2005 to Sept. 2007. WATER TEMPERATURE: Oct. 1985 to Sept. 2000, Feb. 2005 to Sept. 2007. DISSOLVED OXYGEN: Apr. 1989 to Sept. 2000, Feb. 2005 to Sept. 2007.

INSTRUMENTATION - Water-quality monitor Sept. 1984 to Sept. 2000. Feb. 2005 to Dec. 28, 2007.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 1,020 microsiemens/cm, June 29, 1995; minimum, 39 microsiemens/cm, Jan. 18, 1991. pH: Maximum, 8.9 units, Mar. 20, 2006; minimum, 5.5 units, Dec. 26, 2005. WATER TEMPERATURE: Maximum, 32.5°C, July 16, 17, 1989; minimum, 4.0°C, Dec. 24, 1989. DISSOLVED OXYGEN: Maximum, 19.8 mg/L, Oct. 13, 14, 1989; minimum, 0.3 mg/L, Aug. 1, 2000.