Bois de Sioux River at White Rock Dam, SD
River level and flood forecast · Traverse County
Normal3.4 ftas of Mon 2:30 PM
The river is 10.6 ft below flood stage (14 ft).
Flow: 2 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 21 ft |
| Moderate flood stage | 19 ft |
| Flood stage | 14 ft |
| Action stage | 12.5 ft |
| Record crest (April 20, 1997) | 16.9 ft |
What floods at each level
From the National Weather Service, highest first.
- 86 ftThe road at the dam site will be overtopped
- 84 ftThe water reaches the low steel on the bridge at the dam
- 80 ftThe gates on the dam will be overtopped
- 80 ftThe gates on the dam will be overtopped
- 21 ftMN 16 / SD 101st Street begins to flood.
- 19 ftWater reaches the bottom of the bridge on MN 16 / SD 101st Street
- 14 ftSignificant agricultural flooding begins near the town of White Rock.
- 12.5 ftThe parking lot immediately below the dam bgins to flood.
Highest crests on record
- 16.9 ft — April 20, 1997
- 16.04 ft — April 15, 2011
- 15.8 ft — April 12, 2019
- 15.3 ft — April 13, 2001
- 15.07 ft — April 20, 1969
Recent crests: 9.6 ft (August 21, 2025) · 10.16 ft (March 20, 2020) · 15.8 ft (April 12, 2019) · 10.15 ft (October 6, 2017) · 9 ft (February 24, 2017)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (WHRM5); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.