What is the current flow on San Marcos River?

San Marcos River was running 133 cubic feet per second as of Aug 1, 2026, 5:45 PM UTC, measured at USGS gauge 08172000. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

San Marcos River

Texas. Streamflow and water-temperature readings from USGS gauges. Running 133 cfs as of Aug 1, 2026, 5:45 PM UTC.

Latest Reading

133

cubic feet / second

USGS gauges

Flow measured Aug 1, 2026, 5:45 PM UTC at gauge 08172000. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on San Marcos River

Gauge	Station	Water temp?
08170500	San Marcos Rv at San Marcos, TX	—
08171400	San Marcos Rv nr Martindale, TX	—
08172000	San Marcos Rv at Luling, TX	—

Fly fishing rivers →Texas lakes →

Conditions: USGS NWIS (public domain).