USGS Water-Year Summary for Site 05568000

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	Available Parameters
	00010 Temperature, water(Mean)
	00020 Temperature, air(Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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

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USGS Water-Year Summary 2024

05568000 MACKINAW RIVER NEAR GREEN VALLEY, IL

LOCATION - Lat 40°27'16.8", long 89°36'22.2" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 SE 1/4 sec.12, T.23 N., R.5 W., Tazewell County, IL, Hydrologic Unit 07130004, on right downstream side of bridge on Towerline Road, 2.5 mi east of State Highway 29, 3.9 mi northeast of Green Valley, 5.8 mi south of Pekin, 10.2 mi north of U.S. Highway 136, and at mile 17.3.

DRAINAGE AREA - 1,073 mi². area at site used prior to Oct. 1, 1988, 1089 mi².

REVISIONS HISTORY -

REVISIONS: Gage height for the period Aug. 3-20, 2019, was revised on Apr. 14, 2020, to remove erroneous gage height data.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: March 1921 to October 1956; June 1988 to current.
  STAGE: Water years 1994 to current.
  PARTIAL RECORD: Annual maximum, water years 1957-88.
SURFACE-WATER QUALITY
  CHEMICAL: October 1997 to September 1998.
  SEDIMENT: October 1994 to September 1997.
  MISCELLANEOUS: Contaminants of streambed sediment, July 1997; contaminants of fish tissue,
    July 1997; streambank sediment size, October 1997; Streambed sediment size, October 1997;
    sediment concentration and particle size, water years 1996-98.
BIOLOGICAL
  ALGAE: Water years 1996-97.
  BENTHIC MACROINVERTEBRATES: Water year 1996-97.
  FISH: Water year 1997.
  HABITAT: Water year 1996, 2003.

GAGE -

Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and a crest-stage gage.

Datum of gage is 476.67 ft above North American Vertical Datum of 1988.

Prior to Jan. 17, 1933, chain gage at site 3.5 mi downstream on railroad bridge at datum 2.00 ft higher.

Jan. 17, 1933, to May 13, 1940, chain gage, and May 14, 1940 to Sept. 30, 1952, wire-weight gage at site 3.6 mi downstream at datum 2.00 ft higher.

Oct. 1, 1952 to Oct. 31, 1956, wire-weight gage, and Nov. 1, 1956 to Sept. 30, 1988, crest-stage gage at site 3.6 mi downstream at present datum.

REMARKS - 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, 51,000 ft³/s, from rating extended above 22,000 ft³/s, Dec. 6, 1982, gage height, 16.13 ft, site then in use; maximum gage height, 29.18 ft, Dec. 31, 2015, discharge, 23,100 ft³/s; minimum observed discharge, 17 ft³/s, Oct. 26, 27, 1940.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 6,160 mg/L, May 27, 1996; minimum daily, 4 mg/L, May 11, 1997.

SUSPENDED-SEDIMENT LOADS: Maximum daily 99,800 tons, May 27, 1996; minimum daily, 0.83 tons, Dec. 21, 1996.