What is the current flow on Marias River?

Marias River was running 1,060 cubic feet per second as of Aug 1, 2026, 6:15 PM UTC, measured at USGS gauge 06101500. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

What is the water temperature on Marias River?

73.6°F (23.1°C) as of Aug 1, 2026, 6:15 PM UTC, at USGS gauge 06102050. Marias River carries no state trout classification, so the trout-stress thresholds do not apply to it — this is a water temperature measurement, not a fishery judgement.

Marias River

Montana. Streamflow and water-temperature readings from USGS gauges. Running 1,060 cfs as of Aug 1, 2026, 6:15 PM UTC.

Latest Reading

1,060

cubic feet / second

73.6°F

water temperature (23.1°C)

USGS gauges

Flow measured Aug 1, 2026, 6:15 PM UTC at gauge 06101500. Temperature measured Aug 1, 2026, 6:15 PM UTC at gauge 06102050. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on Marias River

Gauge	Station	Water temp?
06099500	Marias River near Shelby MT	—
06101500	Marias River near Chester MT	—
06102050	Marias River near Loma MT	Yes

Fly fishing rivers →Montana trout water →Montana lakes →

Conditions: USGS NWIS (public domain).