What is the current flow on Thunder Bay River?

Thunder Bay River was running 631 cubic feet per second as of Aug 1, 2026, 6:30 PM UTC, measured at USGS gauge 04133501. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

Thunder Bay River

Michigan. Streamflow and water-temperature readings from USGS gauges. Running 631 cfs as of Aug 1, 2026, 6:30 PM UTC.

Latest Reading

631

cubic feet / second

USGS gauge

Flow measured Aug 1, 2026, 6:30 PM UTC at gauge 04133501. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on Thunder Bay River

Gauge	Station	Water temp?
04133501	THUNDER BAY RIVER AT HERRON ROAD NEAR BOLTON, MI	—

Fly fishing rivers →Michigan lakes →

Conditions: USGS NWIS (public domain).