USGS Surface Water for USA: Streamflow Measurements

USGS Home
Contact USGS
Search USGS

USGS Water Resources

Data Category:
Geographic Area:

Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins

Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide.

Streamflow Measurements for the Nation

08171350 Blanco Rv at San Marcos, TX

Hays County, Texas

Hydrologic Unit Code 12100203

Latitude 29°52'46.24", Longitude 97°54'38.71" NAD83

Drainage area 436.0 square miles

Gage datum 542.97 feet above NAVD88

**Output formats**
HTML table with channel data
HTML table without channel data
Tab-separated data with channel data
Tab-separated data without channel data
Graph of data
Reselect output format

U.S. Department of the Interior | U.S. Geological Survey
Title: Surface Water for USA: Streamflow Measurements
URL: https://nwis.waterdata.usgs.gov/nwis/measurements?

Page Contact Information: Texas Water Data Support Team
Page Last Modified: 2025-07-08 15:05:16 EDT
0.97 0.66 nadww02