Major Flood
6 ft
Current Water Level
Gage Height
Loading...
Streamflow
Loading...
Last Reading
Loading...
FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
5.5 ft
Minor Flood
4.5 ft
Action Stage
4 ft
What Floods at Each Level
6 ft
Major Flood Stage. Water will begin to flow down Main Street in Keystone.
5.5 ft
Moderate Flood Stage. Water will begin to cover bridges and parking areas in Keystone.
5 ft
Minor flooding along the creek and downstream. Water begins to fill Grizzly Bear Creek in Keystone.
4.5 ft
Minor flood stage. The creek will overflow and cut off access to Grizzly Gulch Road. Overflows the lower banks downstream from gage.
4 ft
Action Stage and bankfull.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
Loading chart data...
Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Oct 10, 2013 | 6.32 ft | 962 cfs |
| May 19, 2016 | 5.78 ft | 459 cfs |
| May 27, 2019 | 5.71 ft | 531 cfs |
About This Gauge
USGS Site
NWS LID
GNKS2
River
Grizzly Bear Creek
County
Pennington, SD
Coordinates
43.8780°N, 103.4377°W
Get Flood Alerts for Grizzly Bear Creek
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Grizzly Bear Creek near Keystone?
The Grizzly Bear Creek near Keystone gauge is maintained by USGS (site 06403850) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Grizzly Bear Creek near Keystone?
The NWS-defined flood stage for Grizzly Bear Creek near Keystone is 4.5 feet. Action stage begins at 4 feet. Moderate flooding starts at 5.5 feet, and major flooding at 6 feet.
How do I get alerts when Grizzly Bear Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add Grizzly Bear Creek near Keystone to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Grizzly Bear Creek near Keystone gauge located?
The gauge is located in Pennington County, South Dakota at coordinates 43.8780°N, 103.4377°W. USGS site number: 06403850. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey
- USGS operates this gage on a seasonal basis. No data are available during winter months.