RIVER GAUGE · GRIZZLY BEAR CREEK
Grizzly Bear Creek near Keystone
Pennington County, South Dakota
Water level1.98 ft
Flow—
Last readingSep 16, 2026, 4:50 PM UTC (last recorded)
Action4 ft84 cfs
Minor flood4.5 ft368 cfs
Moderate flood5.5 ft643 cfs
Major flood6 ft1,045 cfs
The past week
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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.
Highest crests on record
| Date | Level | 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 |
Get an alert when Grizzly Bear Creek rises
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