Grand River (SD) near Little Eagle, SD
River level and flood forecast · Corson County
Normal2.7 ftas of Mon 1:15 PM
The river is 12.3 ft below flood stage (15 ft).
Flow: 49 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 | 21 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 15 ft |
| Action stage | 13 ft |
| Record crest (March 17, 2011) | 21.27 ft |
What floods at each level
From the National Weather Service, highest first.
- 22 ftWater levels will reach the low steel of the bridge on Highway 63
- 21 ftThe community of Little Eagle begins to experience some flooding
- 17 ftExtensive flooding of pasture land begins as both banks of the river are overtopped
- 15 ftLow-lying pasture and hay land along the river begins to flood
Highest crests on record
- 21.27 ft — March 17, 2011
- 21.01 ft — March 12, 1972
- 20.76 ft — August 25, 2014
- 19.16 ft — March 23, 1987
- 18.41 ft — March 23, 1978
Recent crests: 15.47 ft (May 21, 2025) · 12.52 ft (April 11, 2023) · 17.94 ft (June 10, 2021) · 9.28 ft (February 23, 2017) · 11.65 ft (April 20, 2016)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (LIES2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.