What is the current flow on St. Marys River?

St. Marys River was running 24 cubic feet per second as of Aug 1, 2026, 6:00 PM UTC, measured at USGS gauge 04181049. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

St. Marys River

Ohio. Streamflow and water-temperature readings from USGS gauges. Running 24 cfs as of Aug 1, 2026, 6:00 PM UTC.

Latest Reading

cubic feet / second

USGS gauges

Flow measured Aug 1, 2026, 6:00 PM UTC at gauge 04181049. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on St. Marys River

Gauge	Station	Water temp?
04180988	St. Marys River at Rockford OH	—
04181049	St Marys River at Walcot Street at Willshire OH	—

Fly fishing rivers →Ohio lakes →

Conditions: USGS NWIS (public domain).