Grace Coolidge Creek near Custer, SD
River level and flood forecast · Custer County
Normal6.7 ftas of Mon 2 PM
The river is 2.8 ft below flood stage (9.5 ft).
Flow: 1 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 | 11 ft |
| Moderate flood stage | 10 ft |
| Flood stage | 9.5 ft |
| Action stage | 8 ft |
| Record crest (February 9, 1979) | 12.76 ft |
What floods at each level
From the National Weather Service, highest first.
- 11 ftMajor Flood Stage. Extensive inundation of structures and roads possible due to flooding on Grace Coolidge Creek.
- 10 ftModerate Flood Stage. Some inundation of structures and roads along Grace Coolidge Creek.
- 9.5 ftMinor Flood Stage. Minor flooding along Grace Coolidge Creek. Low lying roads in Custer State Park may become impassable.
- 8.5 ftGrace Coolidge Creek begins to overflow roads in Custer State Park.
- 8 ftLow land flooding along the creek begins.
Highest crests on record
- 12.76 ft — February 9, 1979
- 11.39 ft — May 8, 1995
- 10.9 ft — June 15, 1976
- 10.84 ft — September 7, 1989
- 10.67 ft — May 28, 2019
Recent crests: 8.25 ft (January 19, 2024) · 8.03 ft (October 12, 2023) · 7.52 ft (September 14, 2023) · 7.76 ft (December 26, 2022) · 7.19 ft (May 31, 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 (GCOS2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.