RIVER GAUGE · BIG SIOUX RIVER
Big Sioux River near Richland
Union County, South Dakota
Water level1106.57 ft
Flow776 cfs
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action1116 ft
Minor flood1117 ft
Moderate flood1119 ft
Major flood1123 ft
The past week
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What floods at each level
- 1131 ft
The bridge on SD Hwy 50/IA Hwy 3 is overtopped.
- 1124.5 ft
South Dakota Highway 50 begins flooding.
- 1123.5 ft
Iowa Highway 3 begins flooding.
- 1123 ft
Backwater up Brule Creek can begin to cause significant issues in the Richland area where transportation routes in and out of town begin to become a concern.
- 1121 ft
Some farm levees will be overtopped and some farm buildings will be flooded.
- 1119 ft
Widespread flooding of crop and pasture land begins. Water reaches the top of the boat ramp off of Hwy 3 at the gauge.
- 1117 ft
Lower pasture lands begin to flood, and the Millsite Access is flooded.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 22, 2024 | 1128.7 ft | — |
| Jun 17, 2014 | 1125.63 ft | — |
| Mar 15, 2019 | 1124.5 ft | — |
More on Big Sioux River
UpstreamBig Sioux River at Akron
DownstreamBig Sioux River near Jefferson
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 Jefferson
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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