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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2025
06479438 BIG SIOUX RIVER NEAR WATERTOWN, SD
LOCATION - Lat 45°00'22", long 97°09'53" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.09, T.118 N., R.52 W., Codington County, SD, Hydrologic Unit 10170201, 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.
REVISIONS HISTORY - WDR SD-78-1: 1973-74(M), 1976-77(M). WDR SD-10-1: Drainage area.
SURFACE-WATER RECORDS
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.
REMARKS - Record quality ratings may not be included in the
water-year summary for approved records newer than 09/30/2018. Record quality
is still being rated internally. For questions about record quality ratings,
please send email to gs-w-d_NWISWeb_Data_Inquiries@usgs.gov. Satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD - Minimum daily discharge, 0.00 ft³/s, Feb. 1, 1974, no flow for many days in some years.
