USGS Water-Year Summary 2021
06479438 BIG SIOUX RIVER NEAR WATERTOWN, SD
LOCATION - Lat 45°00'22", long 97°09'53" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 NE 1/4 sec.16, T.118 N., R.52 W., Codington County, SD, Hydrologic Unit 10170202, on left bank at downstream side of county highway bridge, 4.9 mi downstream from Mahoney Creek, 6.5 mi upstream from inlet-outlet to Lake Kampeska, and 7.5 mi northwest of Watertown.
DRAINAGE AREA - 525 mi² of which 295 mi² probably is noncontributing. documented runoff occurred during 1994-2002 water years for 213 mi² of the usually noncontributing area.
- WDR SD-78-1: 1973-74(M), 1976-77(M). WDR SD-10-1: Drainage area.
PERIOD OF RECORD - October 1972 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,726.66 ft above NAVD of 1988. Prior to conversion to NAVD88 datum of gage was published as 1,725.81 ft above NGVD29.
EXTREMES FOR PERIOD OF RECORD - Minimum daily discharge, 0.00 ft³/s, Feb. 1, 1974, no flow for many days in some years.