USGS Water-Year Summary 2017
06482000 BIG SIOUX RIVER AT SIOUX FALLS, SD
LOCATION - Lat 43°30'04", long 96°44'53" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 SW 1/4 sec.32, T.101 N., R.50 W., Minnehaha County, SD, Hydrologic Unit 10170203, on right bank near upstream end of bridge on Western Avenue, 0.1 mi downstream from previous gage, and 2.2 mi downstream from mouth of Skunk Creek.
DRAINAGE AREA - 4,642 mi² of which 883 mi² probably is noncontributing, documented runoff occurred during 1994-2002 water years for 213 mi² of the usually noncontributing area.
PERIOD OF RECORD - August 1943 to September 1960, October 2004 to current year.
REVISED RECORDS - WDR SD-10-1: 2008(M); 2009(M); Drainage area.
GAGE - Water-stage recorder. Datum of gage is 1,392.83 ft above NGVD of 1929 (Corps of Engineers).
EXTREMES FOR PERIOD OF RECORD - Maximum combined discharge of bypass and main channel, 16,200 ft³/s, June 17, 1957, gage height, 16.01 ft.