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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
08158827 Onion Creek at Twin Creeks Road near Manchaca, TX
LOCATION - Lat 30°07'34", long 97°49'15" referenced to North American Datum of 1927, Travis County, TX, Hydrologic Unit 12090205, on upstream left side of bridge over Onion Creek at intersection of Twin Creeks Road and Arroyo Doble Road, approximately 3 miles south-southeast of Manchaca.
DRAINAGE AREA - 181 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Apr. 2003 to Jan. 2004, June 2004 to current year.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: Oct. 2004 to May 2005.
BIOCHEMICAL DATA: Oct. 2004 to May 2005.
PESTICIDE DATA: Oct. 2004 to May 2005.
SEDIMENT DATA: Oct. 2004.
GAGE -
Water-stage recorder. Satellite telemetry at station.
Datum of the Gage: 584.16 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS; Ref Frame NAD83 (2011) (EPOCH:2010.0000) ITRF2014 (EPOCH:2022.3253) and Geoid 18. The survey was completed on 4/29/2022 while occupying a TRM referenced to local datum via differential levels.
Prior to 4/29/2022 the datum of the gage was 587.8 ft NAVD88.
REMARKS - No known regulation or diversions. No flow at times. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
