RIVER GAUGE · BIG SIOUX RIVER
Big Sioux River near Jefferson
Union County, South Dakota
Water level9.15 ft
Flow—
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action28 ft
Minor flood31 ft
Moderate flood35 ft
Major flood40 ft
The past week
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What floods at each level
- 42 ft
The lowest portions of Hwy 12 may begin to flood.
- 40.5 ft
At least a couple farmsteads begin to flood.
- 37 ft
Water begins to surround some farmsteads near 329th.
- 35 ft
The lowest portions of 329th are flooded and the floodplain on the South Dakota side is over a mile wide in some areas.
- 31 ft
Significant flooding of crop and pasture land begins.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 23, 2024 | 44.5 ft | 132,000 cfs |
| Mar 16, 2019 | 40.42 ft | 54,700 cfs |
| Jun 25, 2018 | 38.4 ft | 38,300 cfs |
More on Big Sioux River
UpstreamBig Sioux River near Richland
DownstreamBig Sioux River at Sioux City
Big Sioux River near Brandon
Big Sioux River near Bruce
Big Sioux River near Brookings
Big Sioux River near Estelline
Big Sioux River above Flandreau
Big Sioux River near Richland
Big Sioux River below Watertown
Big Sioux River above Canton
Big Sioux River near Castlewood
Big Sioux River near Dell Rapids
Get an alert when Big Sioux River rises
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