Big Sioux River at Sioux City, IA
Is Big Sioux River at Sioux City, IA flooding right now?
Big Sioux River at Sioux City, IA measured 11.18 ft on 2026-09-11 01:30:00 UTC. That observation was 20.8 ft below its 32 ft flood stage. This is the latest available reading, not a guarantee of current conditions.
Gauge height
11.18 ft
Streamflow
—
Minor flooding here begins at 32 ft, with major flooding at 41 ft. The highest crest on record was 44.9 ft on Sun, Jun 23, 2024.
Flood stages at this gauge
| Category | Stage | Current distance |
|---|---|---|
| Action | 29 ft | 17.8 ft below |
| Minor flood | 32 ft | 20.8 ft below |
| Moderate flood | 38 ft | 26.8 ft below |
| Major flood | 41 ft | 29.8 ft below |
Highest crests on record
| Stage | Date |
|---|---|
| 44.9 ft | 2024-06-23 |
| 37.7 ft | 2014-06-20 |
| 37.46 ft | 2019-03-17 |
| 31.57 ft | 2018-06-25 |
| 21.89 ft | 2020-04-02 |
Nearby gauges
| Gauge | Distance | County |
|---|---|---|
| Perry Creek at 38th Street at Sioux City, IA | 3.6 mi | Woodbury County |
| Missouri River at Sioux City, IA | 4.3 mi | Dakota County |
| Big Sioux River near Jefferson, SD | 7.3 mi | Union County |
| Perry Creek near Hinton, IA | 8.6 mi | Plymouth County |
| Floyd River at James, IA | 9.3 mi | Plymouth County |
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Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.