USGS Water-Year Summary for Site 08159000

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	Available Parameters
	00060 Discharge(Max.,Min.,Mean)
	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

08159000 Onion Creek at U.S. Highway 183, Austin, TX

LOCATION - Lat 30°10'40", long 97°41'18" referenced to North American Datum of 1927, Travis County, TX, Hydrologic Unit 12090205, on right bank at downstream side of downstream bridge on U.S. Highway 183, 2.4 mi downstream from Williamson Creek, 3.2 mi southwest of Del Valle, and 7.5 mi southeast of the State Capitol Building in Austin.

DRAINAGE AREA - 321 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - June 1924 to Mar. 1930 station was published as "near Del Valle", Mar. 1976 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Oct. 1976 to Aug. 1988. BIOCHEMICAL DATA: Oct. 1976 to Aug. 1988. BIOLOGICAL DATA: Oct. 1976 to Aug. 1988. PESTICIDE DATA: Oct. 1976 to June 1985. RADIOCHEMICAL DATA: Jan. 1980 to June 1981. SEDIMENT DATA: Nov. 1976 to July 1982.

GAGE -

Water-stage recorder. Satellite telemetry at station.

Datum of the gage: 443.278 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS, Ref Frame NAD83 (2011)(EPOCH:2010.0000) ITFR2014 (EPOCH:2023.7775) and Geoid 18. The survey was completed October 11th, 2023 while occupying a TRM referenced to local gage datum via differential levels.

Prior to 10/11/2023 the datum of the gage was 442.85 ft NGVD29 (Texas Department of Transportation datum). May 15, 1924, to Mar. 15, 1930, nonrecording gage at highway bridge 1,700 ft upstream at 6.42 ft higher datum.

REMARKS - Records fair except for estimated daily discharge and daily discharges below 1.0 ft³/s, which are poor. No known regulation or diversions. Flow is slightly affected by several small ponds on main channel and tributaries 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 1869 occurred about July 3, 1869, stage about 38 ft, from newspaper accounts, and Sept. 9, 1921, stage 38.0 ft, from floodmark, present site and datum.