RIVER GAUGE · BIG SIOUX RIVER
Big Sioux River near Estelline
Hamlin County, South Dakota
Water level1639.02 ft
Flow33 cfs
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action1642.5 ft
Minor flood1644 ft
Moderate flood1645.5 ft
Major flood1648 ft
The past week
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What floods at each level
- 1651 ft
Highway 28 and 463rd Avenue begin to flood.
- 1650 ft
464th Avenue begins to flood.
- 1649 ft
water reaches the bottom of the bridge on 463rd Avenue, and 195th Street begins to flood.
- 1648 ft
water reaches the bottom of the bridges on Highway 28, 464th Avenue, and 195th Street. Also, 192nd Street begins to flood.
- 1646 ft
water reaches the bottom of the bridge on 192nd Street.
- 1645.5 ft
widespread flooding of agricultural lands begins.
- 1644 ft
significant flooding of crop and pasture land begins.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 29, 2025 | 1647.03 ft | — |
| Mar 27, 2019 | 1646.9 ft | — |
| Apr 11, 2023 | 1646.34 ft | — |
More on Big Sioux River
UpstreamBig Sioux River near Castlewood
DownstreamBig Sioux River near Bruce
Big Sioux River near Brandon
Big Sioux River near Bruce
Big Sioux River near Brookings
Big Sioux River above Flandreau
Big Sioux River near Jefferson
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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