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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
06485950 Big Sioux River at Sioux City, IA
LOCATION - Lat 42°31'28", long 96°28'48.7" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 SW 1/4 sec.14, T.89 N., R.48 W., Woodbury County, IA, Hydrologic Unit 10170203, on right bank 30 ft downstream from Military Road in North Sioux City, 5.1 mi upstream from the Missouri River, and 1.0 mi east of exit 2 off of Interstate 29.
DRAINAGE AREA - 8,430 mi² of which 884 mi² probably is noncontributing. 8,430 mi² of which 884 mi² probably is noncontributing.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 2015 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,060 ft above NAVD of 1988, from topographic map.
REMARKS - Record quality ratings may not be included in the water-year summary for approved records newer than Sept. 30, 2018. Record quality is still being rated internally. For questions about record quality ratings, please send email to gs-w-sd_NWISWEB_Data_Inquiries@usgs.gov. Satellite data-collection platform at station.
