What is the current flow on Big Sioux River?

Big Sioux River was running 1,470 cubic feet per second as of Aug 1, 2026, 6:30 PM UTC, measured at USGS gauge 06485950. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

Big Sioux River

Iowa. Streamflow and water-temperature readings from USGS gauges. Running 1,470 cfs as of Aug 1, 2026, 6:30 PM UTC.

Latest Reading

1,470

cubic feet / second

USGS gauges

Flow measured Aug 1, 2026, 6:30 PM UTC at gauge 06485950. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

USGS Gauges on Big Sioux River

Gauge	Station	Water temp?
06485500	BIG SIOUX RIVER AT AKRON, IA	—
06485950	BIG SIOUX RIVER AT SIOUX CITY, IA	—

Fly fishing rivers →Iowa lakes →

Conditions: USGS NWIS (public domain).