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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 2024
06479215 BIG SIOUX RIVER NEAR FLORENCE, SD
LOCATION - Lat 45°10'51", long 97°11'09" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.17, T.120 N., R.52 W., Grant County, SD, Hydrologic Unit 10170201, on right bank near downstream side of county bridge, 11.0 mi northeast of Florence, and 2.2 mi upstream from Indian Creek.
DRAINAGE AREA - 68.3 mi².
REVISIONS HISTORY - WDR SD-10-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1984 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,781.54 ft above NAVD88. Prior to conversion to NAVD88 datum of gage was published as 1,780.57 ft above NGVD29.
REMARKS - Accuracy of records for water years prior to 2014 are noted in the individual Annual Data Reports for those water years. For water years 2014 onward, records good except those for June 1, 2014 to Aug. 10, 2014, Mar. 28, 2015 to Apr. 28, 2015, May 10, 2015 to Sept. 21, 2015, Oct. 28, 2015 to Dec. 7, 2015, June 9 - 27, 2016, July 24, 2016 to Aug. 23, 2016, Oct. 6, 2016 to Nov. 7, 2016, June 13, 2017 to Sept. 30, 2018, May 23, 2019 to Oct. 8, 2019, Apr. 12, 2021 to Oct. 4, 2021, and Sept. 5, 2022 to Nov. 3, 2022, which are fair and those for estimated discharges, which are poor. Satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD - Minimum daily discharge, 0.00 ft³/s, Aug. 9, 1985, no flow for some days in water years 1985, 1990-91, 2004, 2013, and 2018.
