Click
to
hide
Water-Year
Summary
instructions
and
information
- 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.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2025
08171400 San Marcos River near Martindale, TX
LOCATION - Lat 29°49'56.23", long 97°50'32.58" referenced to North American Datum of 1983, Caldwell County, TX, Hydrologic Unit 12100203, New location: Lat 29°50'13.16", long 97°50'33.27" referenced to North American Datum of 1983, Caldwell County, TX, Hydrologic Unit 12100203,
DRAINAGE AREA - 547 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 2011 to Current year.
GAGE - Water-stage recorder. Datum of gage is 480.260 ft. above NADV88 on 08/29/2024. Prior datum of gage was 28.419 ft above NGVD of 1929. Satellite telemeter at station.
REMARKS - Records are fair for the Water Year. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
