USGS Water-Year Summary for Site 06607500

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	00060 Discharge(Mean)

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Water year 2025: 2025-10-01 to 2026-09-30

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USGS Water-Year Summary 2025

06607500 Little Sioux River near Turin, IA

LOCATION - Lat 41°57'54.1", long 95°58'20.1" referenced to North American Datum of 1983, in NE 1/4 NE 1/4 NW 1/4 sec.33, T.83 N., R.44 W., Monona County, IA, Hydrologic Unit 10230003, on left bank on downstream side of bridge on County Highway E54, 3.8 mi south of Turin, 1.0 mi east of gaging station Monona-Harrison Ditch near Turin (station 06602400), 2.5 mi downstream from Maple River, and 13.4 mi upstream from mouth.

DRAINAGE AREA - 3,526 mi².

REVISIONS HISTORY -

WSP 1440: Drainage area. WSP 1560: Drainage area. WDR IA-95-1: Period of record.

Revisions: Peak streamflow for water years 1940-1957 were revised on May 5, 2021 to indicate that discharge is affected by regulation or diversion.

Revisions: Gage datum was updated to 1,019.91 ft NAVD88 on July 27, 2023, based on a GNSS Level II survey using GEOID18.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Discharge records from May 1942 to September 1957, January 1958 to current year. June 1942 to January 1958, at site 1,200 ft east on old river channel. Records are not equivalent owing to diversion into Monona-Harrison Ditch through equalizer ditch 1.5 mi upstream from 1923 to 1958, and diversion with Monona-Harrison Ditch through diversion ditch 8.3 miles upstream since 1958.

GAGE - Water-stage recorder.

Datum of gage is 1,019.91 ft. above NAVD of 1988.

Prior to July 15, 1958, non-recording gages near current site at different datums; July 15 to September 3, 1958, non-recording gage at same site and datum.

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 2004 to 2014.

PERIOD OF DAILY RECORD -
SUSPENDED-SEDIMENT DISCHARGE: April 1939 to June 1948, October 1948 to September 1951, March to December 1959, March to November 1960, March to November 1961, March to November 1962, March to November 1963, March 1964 to January 1965, April 1965 to June 1969, records provided by U.S. Army Corps of Engineers.