USGS Water-Year Summary for Site 06810000

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	00060 Discharge(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

06810000 Nishnabotna River above Hamburg, IA

LOCATION - Lat 40°36'04.3", long 95°38'40.2" referenced to North American Datum of 1983, in NE 1/4 SW 1/4 SE 1/4 sec.11, T.67 N., R.42 W., Fremont County, IA, Hydrologic Unit 10240004, on left bank on downstream side of bridge on U.S. Highway 275 and State Highway 333 in Hamburg, 4.7 mi downstream from confluence of East Nishnabotna River and West Nishnabotna River, and 11.0 mi upstream from mouth.

DRAINAGE AREA - 2,806 mi².

REVISIONS HISTORY - WSP 1240: 1923, 1929-1937, 1938-1940(M), 1943(M). WSP 1440: Drainage area. WDR IA-74-1: 1973. WDR US-2008: Location.
Revisions: Gage datum was revised to 892.31 ft NAVD88 on July 27, 2023, as determined by a GNSS Level II survey using GEOID18. Gage datum was previously published in error, Oct. 3, 2007, to July 27, 2023, as 894.17 ft NGVD29.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Discharge records from March 1922 to September 1923, October 1928 to current year. March 1922 to September 1923, monthly mean discharge for some periods published in WSP 1310.

GAGE -

Water-stage recorder. Datum of gage is 892.31 ft above North American Vertical Datum of 1988. Prior to October 1, 1923, non-recording gage at site 3.5 mi downstream at different datum; October 5, 1928, to September 6, 1929, non-recording gage at site 2.7 mi upstream at datum of 894.59 ft NGVD29; September 7, 1929, to June 5, 1947, non-recording gage at site 2.5 mi upstream at datum of 894.17 ft; June 6 to July 22, 1947, non-recording gage at site 2.7 mi upstream at different datum; July 23, 1947, to November 16, 1950, non-recording gage, and November 17, 1950, to October 2, 2007, water-stage recorder, both at site 2.5 mi upstream at datum of 894.17 ft NGVD29.

REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1979-1993, 2004 to 2014.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Daily instantaneous, October 1979 to September 1981.
WATER TEMPERATURE: Daily instantaneous, October 1979 to September 1981.
SUSPENDED-SEDIMENT DISCHARGE: April 1939 to September 1951, records provided by U.S. Army Corps of Engineers.