Rivers in South Dakota

Big Sioux River near Estelline

Hamlin County, South DakotaNWS BSES2Sioux Falls office

Below flood stage
1639.3ftStage

Observed Sun, Sep 27, 4:00 AM CDT

Flood stage
1644.0 ft
Record crest
1647.0 ft2025

Open the live map with the river flood outlook

Flood stages and impacts

CategoryStage
Major flood1648.0 ft
Moderate flood1645.5 ft
Minor flood1644.0 ft
Action1642.5 ft
  1. 1651.0 ftHighway 28 and 463rd Avenue begin to flood.
  2. 1650.0 ft464th Avenue begins to flood.
  3. 1649.0 ftwater reaches the bottom of the bridge on 463rd Avenue, and 195th Street begins to flood.
  4. 1648.0 ftwater reaches the bottom of the bridges on Highway 28, 464th Avenue, and 195th Street. Also, 192nd Street begins to flood.
  5. 1646.0 ftwater reaches the bottom of the bridge on 192nd Street.
  6. 1645.5 ftwidespread flooding of agricultural lands begins.
  7. 1644.0 ftsignificant flooding of crop and pasture land begins.

Crest history

7 crests on NOAA’s list since 2018.

#DateStage
1June 30, 20251647.0 ft
2March 28, 20191646.9 ft
3April 12, 20231646.3 ft
4April 23, 20181645.9 ft
5April 13, 20181644.6 ft
6March 29, 20201644.4 ft
7June 24, 20241643.8 ft

Most recent crests

  • June 30, 2025: 1647.0 ft
  • June 24, 2024: 1643.8 ft
  • April 12, 2023: 1646.3 ft
  • March 29, 2020: 1644.4 ft
  • March 28, 2019: 1646.9 ft
  • April 23, 2018: 1645.9 ft
  • April 13, 2018: 1644.6 ft

Nearby

Upstream, downstream and the gauges around this one.

What this means

Forecasts by the Missouri Basin River Forecast Center. Forecasts are not available. Only observed stages are available for this point. No forecasts are available for this location Gauge reading may be affected by ice.

Sources

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service.