USGS Water-Year Summary 2019
05291000 WHETSTONE RIVER NEAR BIG STONE CITY, SD
LOCATION - Lat 45°17'30", long 96°29'14" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.18, T.121 N., R.46 W., Grant County, SD, Hydrologic Unit 07020001, on right bank 20 ft downstream from former highway bridge site, 1.5 mi west of Big Stone City, S.D., and 4.5 mi upstream from Big Stone Lake.
DRAINAGE AREA - 398 mi². (406 sq. miles from StreamStats, 2012)
- WSP 895: Drainage area. WSP 1308: 1932(M), 1935(M).
PERIOD OF RECORD - March 1910 to November 1912 (no winter records), and March 1931 to current year. Monthly discharge only for some periods, published in WSP 1308.
GAGE - Water-stage recorder. Datum of gage is 996.96 ft above sea level (NGVD of 1912). Mar. 8, 1910 to Nov. 30, 1912, non-recording gage two miles downstream at different datum. Mar. 18, 1931 to May 3, 1939, non-recording gage, at site 20 feet upstream at present datum. May 4, 1939 to Nov. 8, 1952, water-stage recorder at site 80 feet downstream at present datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage known, about 26 ft in June 1919, present site and datum, from information by local resident, discharge 29,000 ft³/s, from dam break.
EXTREMES FOR PERIOD OF RECORD - Minimum discharge, 0.00 ft³/s, many days, several years.