USGS Water-Year Summary for Site 06481000

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean) [(2)]
	00065 Gage height(Mean) [(3)]
	99133 NO3+NO2,water,insitu(Mean)

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Water year 2024: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2024

06481000 BIG SIOUX RIVER NEAR DELL RAPIDS, SD

LOCATION - Lat 43°47'25.7", long 96°44'43.2" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.29, T.104 N., R.49 W., Minnehaha County, SD, Hydrologic Unit 10170203, on left bank at downstream side of county highway bridge, 0.2 mi downstream from confluence of divided channels, and 3.0 mi southwest of Dell Rapids.

DRAINAGE AREA - 3,927 mi² of which 870 mi² probably is noncontributing. Documented runoff occurred during Water Years 1994-2002 for 213 mi² of the usually noncontributing area.

REVISIONS HISTORY - WDR SD-10-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1948 to current year.

GAGE -

Water-stage recorder and crest-stage gage. Datum of gage is 1,456.94 ft above the North American Vertical Datum of 1988 (NAVD88) and 1,455.99 feet above the National Geodetic Vertical Datum of 1929 (NGVD29).

Prior Datums are as follows:

Prior to Nov. 11, 1949, nonrecording gage and Nov. 11, 1949, to Sept. 30, 1951, water-stage recorder, at present site at datum of 1,455.95 feet above the National Geodetic Vertical Datum of 1929 (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, Aug. 25 and 26 to Oct. 17, 1976.

WATER-QUALITY RECORDS

PERIOD OF RECORD - PERIODIC WATER QUALITY SAMPLES - Water Year 1960 to 1984, 2017 to 2020, 2025 to current year.

PERIOD OF DAILY RECORD -

DAILY WATER QUALITY RECORDS -

Water temperature - March 2004 to November 2010.

Specific conductance - March 2004 to November 2010.

Dissolved oxygen - March 2004 to November 2010.

pH - March 2004 to November 2010.

Turbidity - March 2004 to November 2010.

Nitrate plus nitrite - April 2017 to July 2023.