What is the current flow on St Mary River?

St Mary River was running 1,050 cubic feet per second as of Aug 1, 2026, 6:15 PM UTC, measured at USGS gauge 05017500. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

St Mary River

Montana. Streamflow and water-temperature readings from USGS gauges. Running 1,050 cfs as of Aug 1, 2026, 6:15 PM UTC.

Latest Reading

1,050

cubic feet / second

USGS gauge

Flow measured Aug 1, 2026, 6:15 PM UTC at gauge 05017500. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on St Mary River

Gauge	Station	Water temp?
05017500	St. Mary River near Babb MT	—

Fly fishing rivers →Montana trout water →Montana lakes →

Conditions: USGS NWIS (public domain).