USGS Water-Year Summary for Site 08158600

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

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

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USGS Water-Year Summary 2023

08158600 Walnut Creek at Webberville Road, Austin, TX

LOCATION - Lat 30°16'59", long 97°39'17" referenced to North American Datum of 1927, Travis County, TX, Hydrologic Unit 12090205, on left bank, 10 ft upstream from bridge on Farm Road 969, 0.8 mi downstream from Little Walnut Creek, 2.8 mi upstream from Colorado River, 5.2 mi east of the State Capitol Building in Austin, and 2.8 mi upstream from mouth.

DRAINAGE AREA - 51.3 mi².

REVISIONS HISTORY - WDR TX-00-4: (daily mean discharge, Feb. 11, 1999).

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1966 to current year.

GAGE -

Water-stage recorder. Satellite telemetry at station.

Datum of gage: 426.233 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS, Ref Frame NAD83 (2011)(EPOCH:2010.0000) ITRF2014 (EPOCH:2023.0706) and Geiod18. The survey was completed on January 26th, 2023, while occupying a TRM that was referenced to local datum via differential levels.

Prior to January 26th, 2023, the datum of the gage was 425.96 ft NGVD29 based on a differential levels circuit to USC&GS BM C-804.

REMARKS - Records poor. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 15, 1935, reached a stage of 24 ft due to backwater from Colorado River. A flood in 1919 reached a stage of 22 ft, from information by local residents. Maximum stage since at least 1891, that of May 25, 1981.

WATER-QUALITY RECORDS

PERIOD OF RECORD - CHEMICAL DATA: Apr. 1976 to Aug. 2017. BIOCHEMICAL DATA: Apr. 1976 to Aug. 2017. BIOLOGICAL DATA: Apr. 1976 to July 2007. RADIOCHEMICAL DATA: Jan. 1980 to June 1981, May 2002 to Mar. 2006. PESTICIDE DATA: Nov. 1976 to June 1985, Apr. 2002 to May 2002, Jan. 2006 to May 2008. SEDIMENT CHEMISTRY DATA: May 2002 to June 2002, Jan. 2006 to Mar. 2006. SEDIMENT DATA: Dec. 1976, Jan. 1978 to Apr. 1980, July 1982, May 1999, Mar. 2001 to May 2010.