South Fork Grand River (SD) near Cash, SD
River level and flood forecast · Perkins County
Normal0.7 ftas of Mon 2:15 PM
The river is 11.3 ft below flood stage (12 ft).
Flow: 10 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 | 16 ft |
| Moderate flood stage | 14 ft |
| Flood stage | 12 ft |
| Action stage | 10 ft |
| Record crest (March 18, 2009) | 12.78 ft |
What floods at each level
From the National Weather Service, highest first.
- 16 ftMajor flood stage. Significant and widespread flooding along the South Fork of the Grand River from Divide Road to Shadehill Reservoir. Water may approach portions of Divide Road.
- 14 ftModerate flood stage. Widespread flooding of pasture lands along the South Fork of the Grand River. Water will approach the low steel on the Divide Road bridge.
- 12 ftMinor flood stage. Minor flooding of pasture land along the South Fork of the Grand River from Divide Road to White Butte Road upstream of Shadehill Reservoir.
- 10 ftAction stage. Low lying areas along the South Fork of the Grand River will be innundated.
Highest crests on record
- 12.78 ft — March 18, 2009
- 11.46 ft — June 18, 2014
- 11.11 ft — March 24, 2019
- 9.51 ft — March 17, 2011
- 9.45 ft — March 10, 1972
Recent crests: 2.31 ft (June 22, 2024) · 2.82 ft (January 16, 2024) · 4.23 ft (June 26, 2023) · 5.12 ft (March 18, 2023) · 4.84 ft (April 24, 2022)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (CSHS2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.