USGS Water-Year Summary 2021
06431500 SPEARFISH CREEK AT SPEARFISH, SD
LOCATION - Lat 44°28'57", long 103°51'40" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.15, T.6 N., R.2 E., Lawrence County, SD, Hydrologic Unit 10120203, on right bank in city park in Spearfish, 500 ft downstream from fish hatchery and nearest tributary, and 9.8 mi upstream from mouth.
DRAINAGE AREA - 165 mi².
- WDR SD-10-1: Drainage area.
PERIOD OF RECORD - Oct. 1946 to current year.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 3,640 ft above NGVD of 1929, from topographic map. Prior to Dec. 5, 1946, nonrecording gage at same site and datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jun. 5, 1904, reached a stage of 7.00 ft, site and datum of former gage near Spearfish, 1.0 mi upstream, drainage area, 157 mi²; discharge about 5,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,240 ft³/s, May 15, 1965, from rating curve extended above 520 ft³/s, on basis of slope-area discharge measurement of peak flow, gage height, 10.53 ft; minimum daily discharge, 9.0 ft³/s, Dec. 2, 1959, no flow for part of Oct. 18, 1970.