USGS Water-Year Summary for Site 05586100

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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

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USGS Water-Year Summary 2023

05586100 ILLINOIS RIVER AT VALLEY CITY, IL

LOCATION - Lat 39°42'11.5", long 90°38'35.1" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 NW 1/4 sec.34, T.15 N., R.14 W., Scott County, IL, Hydrologic Unit 07130011, on upstream side of Norfolk & Southern Corporation Railroad bridge at Flints Creek, 0.4 mile east of Valley City, 1.8 miles downstream from Mauvaise Terre Creek, and at mile 61.3. Auxiliary gage 10.0 miles upstream.

DRAINAGE AREA - 26,743 mi². does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: October 1938 to current. Prior to October 1960, at site 0.2 mi upstream at
    same datum. Prior to October 1989, published as "at Meredosia." Records are
    considered equivalent.
  STAGE: Water years 1994 to current.
  PARTIAL RECORD: Annual maximum, water years 1921 to 1938.
SURFACE-WATER QUALITY
  CHEMICAL: Water years 1975-93 and 1996-2005.
  DISSOLVED OXYGEN: Water years 2001-2003.
  PH: Water years 2001-2003.
  SEDIMENT: February 1980 to 2011.
  SPECIFIC CONDUCTANCE: Water years 1975-81, 2001-2003.
  TURBIDITY: Water years 2001-2003.
  WATER TEMPERATURE: Water years 1975-81, 2001-2003.
  MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish
    tissue, October 1996; sediment concentration and particle size, water years 1996-2005.
BIOLOGICAL
  ALGAE: Water years 1980-81, 1996-98, and 2002-2005.
  BENTHIC MACROINVERTEBRATES: Water years 1997-98, 2002-2005.
  FISH: Water years 1998, 2003-2005.
  HABITAT: Water years 1997-98, 2003, 2005.

GAGE -

U.S. Army Corps of Engineer's water-stage recorder and satellite telemeter, and crest-stage gage. Datum of gage is 417.68 ft above NAVD of 1988.

Prior to Nov. 25, 1992; and Oct. 1, 1994, to current: auxiliary gage (05585500) at site 10.0 mi upstream. Nov. 25, 1992, to Sept. 30, 1994: auxiliary gage operated at this site (05586100).

REMARKS -

Occasional regulation at low flow by navigation dam at La Grange.

Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal.

Suspended-sediment samples were collected by local observers generally twice weekly with additional samples collected during high runoff periods. Since February 1994, samples used to compute sediment record have been collected at upstream side Rt. 106 bridge at Florence at mile 56.

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

EXTREMES FOR PERIOD OF RECORD -

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 123,000 ft³/s, May 26-28, 1943; maximum gage height, 28.61 ft, May 26, 1943, site then in use; minimum daily discharge, 1,330 ft³/s, Sept. 2, 1984.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,720 mg/L, Apr. 14, 1981; minimum daily, 13 mg/L, Nov. 14-15, 2007.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 410,000 tons, June 4, 1980; minimum daily, 172 tons, Sept. 2, 1984.