Cheyenne River at Edgemont, SD
River level and flood forecast · Fall River County
Normal1.2 ftas of Mon 12 PM
The river is 7.8 ft below flood stage (9 ft).
Flow: 3 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 | 13 ft |
| Moderate flood stage | 11 ft |
| Flood stage | 9 ft |
| Action stage | 8 ft |
| Record crest (May 1, 1922) | 14 ft |
What floods at each level
From the National Weather Service, highest first.
- 14 ftHighest known flood occurred May 1 1922.
- 13.65 ftHighest flood for the period of record occurred May 20 1978.
- 13 ftMajor Flood Stage. Extensive flooding along the Cheyenne River upstream of Angostura Reservoir with inundation of structures and roads possible.
- 11 ftModerate Flood Stage. Widespread flooding of agricultural land along the Cheyenne River upstream of Angostura Reservoir.
- 9 ftMinor Flood Stage. Minor flooding of agricultural land along the Cheyenne River upstream of Angostura Reservoir.
- 8 ftAction stage and bankfull stage. The lower portions of the left bank begins to overflow. Flooding of low-lying areas along the Cheyenne River.
Highest crests on record
- 14 ft — May 1, 1922
- 13.65 ft — May 20, 1978
- 13 ft — May 12, 1920
- 11.46 ft — June 17, 1962
- 10.57 ft — May 25, 1971
Recent crests: 4.79 ft (October 15, 2023) · 4.86 ft (July 9, 2023) · 2.28 ft (June 8, 2022) · 4.83 ft (May 24, 2021) · 4.51 ft (March 8, 2020)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (EDGS2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.