USGS Water-Year Summary for Site 06486000

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	Available Parameters
	00010 Temperature, water(Mean)
	00060 Discharge(Mean)
	80154 Suspnd sedmnt conc(Mean)
	80155 Suspnd sedmnt disch(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

06486000 Missouri River at Sioux City, IA

LOCATION - Lat 42°29'10.3", long 96°24'47.1" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 sec.16, T.29 N., R.9 E., Dakota County, NE, Hydrologic Unit 10230001, on right bank on upstream side of bridge on U.S. Highway 20 and 77 in South Sioux City, 1.9 mi downstream from Big Sioux River, and 732.2 mi upstream from mouth. Sediment samples collected by boat in vicinity of gage.

DRAINAGE AREA - 314,600 mi².

REVISIONS HISTORY - WSP 716: 1929-1930. WSP 876: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Discharge records from October 1897 to current year. Prior to October 1928 and October 1931 to September 1938, monthly mean discharge published in WSP 1310. January 1879 to December 1890, monthly mean discharge published in House Document 238, 73rd Congress, 2nd session, Missouri River. Gage-height records collected in this vicinity from September 1878 to December 1899 published in reports of the Missouri River Commission, and since July 1889 in reports of the U.S. National Weather Service.

GAGE -

Water-stage recorder.

Datum of gage is 1,057.42 ft above North American Vertical Datum of 1988 (U.S. Army Corps of Engineers).

Feb. 1, 1981, to Aug. 1, 2016, same site at gage datum 1,056.98 ft above National Geodetic Vertical Datum of 1929.

Oct. 1, 1970, to Jan. 31, 1981, water-stage recorder at site 227 ft downstream at datum 1,056.98 ft above National Geodetic Vertical Datum of 1929.

Oct. 1, 1969, to Sept. 30, 1970, water-stage recorder at site 227 ft downstream at datum 1,076.98 ft above National Geodetic Vertical Datum of 1929.

Feb. 15, 1935, to Sept. 30, 1969, water-stage recorder at site 227 ft downstream at datum 1,076.96 ft above National Geodetic Vertical Datum of 1929.

Jan. 1, 1906, to Feb. 14, 1935, non-recording gage at site 227 ft downstream at datum 1,078.64 ft above mean sea level.

Sept. 2, 1878, to Dec. 31, 1905, non-recording gage at several sites within 1.7 mi of current site at various datums.

REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center. Flow regulated by upstream main-stem reservoirs. Fort Randall Dam was completed in July 1952, with storage beginning in December 1952. Gavins Point Dam was completed in July 1955, with storage beginning in December 1955.

EXTREMES FOR PERIOD OF RECORD - Minimum daily discharge, 2,920 ft³/s, December 30, 1941; minimum instantaneous gage height, 4.12 ft, December 30, 2013.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1972-2000, 2004 to current year. Daily sediment loads for October 1954 to September 1971 are in reports of the U.S. Army Corps of Engineers.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1972 to September 1976, October 1977 to September 1981, October 1991 to September 2000, October 2003 to September 2010, records fragmentary for some periods. Beginning October 2010, daily instantaneous values published with water-quality samples.
WATER TEMPERATURE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1971 to September 1976, October 1977 to September 1981, October 1991 to September 2000, October 2003 to September 2010, records fragmentary for some periods. Beginning October 2010, daily instantaneous values published with water-quality samples. Daily mean, October 2011 to current year, records fragmentary.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: October 1954 to December 1959, April to November 1960, March to November 1961, March to November 1962, March to November 1963, March 1964 to September 1971, October 1971 to September 1976, October 1991 to September 2000, October 2003 to current year. Prior to October 1971, suspended-sediment discharge records only, provided by U.S. Army Corps of Engineers.