Moreau River (SD) near Whitehorse, SD
River level and flood forecast · Dewey County
Normal1.9 ftas of Mon 1:30 PM
The river is 19.1 ft below flood stage (21 ft).
Flow: 9 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 5 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 25 ft |
| Moderate flood stage | 23 ft |
| Flood stage | 21 ft |
| Action stage | 19 ft |
| Record crest (March 25, 2019) | 27.79 ft |
What floods at each level
From the National Weather Service, highest first.
- 25.8 ftMajor flooding of rural and pasture lands will occur as the banks on both sides of the river will be overtopped
- 25 ftThe water level will reach the low steel on the highway bridge at the gauging location. Water is over the road on both sides of the bridge
- 23 ftLarge amounts of pasture land on the right bank of the river are flooded
- 21 ftLow-lying pasture lands along the river begin to flood
Highest crests on record
- 27.79 ft — March 25, 2019
- 27.68 ft — March 21, 1997
- 26.92 ft — March 20, 2011
- 26.2 ft — March 14, 1972
- 26 ft — May 24, 1982
Recent crests: 10.08 ft (May 13, 2022) · 7.51 ft (June 10, 2021) · 13.8 ft (May 24, 2020) · 27.79 ft (March 25, 2019) · 10.27 ft (February 26, 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 (WHIS2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.