USGS Water-Year Summary 2021
06403850 GRIZZLY BEAR CREEK NEAR KEYSTONE, SD
LOCATION - Lat 43°52'41", long 103°26'14" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 NW 1/4 sec.17, T.2 S., R.6 E., Pennington County, SD, Hydrologic Unit 10120109, on downstream right wingwall of Highway 16A bridge and 1.2 mi southwest of Keystone.
DRAINAGE AREA - 8.84 mi².
- WDR SD-10-1: Drainage area.
PERIOD OF RECORD - 1998-present.
GAGE - Seasonal water-stage recorder. Elevation of gage is 4,510 ft above NGVD of 1929, from topographic map. METWARN station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 962 ft³/s, from rating curve extended above 430 ft³/s, Oct. 11, 2013, gage height, 6.32 ft.