USGS Water-Year Summary for Site 05558300

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	63680 Turbidity, Form Neph(Mean,Min.,Max.)
	72240 CO2 at water surface(Max.,Mean,Min.)

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

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USGS Water-Year Summary 2024

05558300 ILLINOIS RIVER AT HENRY, IL

LOCATION - Lat 41°06'26.2", long 89°21'22.4" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 NE 1/4 sec.16, T.13 N., R.10 E., Marshall County, IL, Hydrologic Unit 07130001, on right bank at grain elevator, 1100 ft downstream from State Highway 18 bridge, 4.1 mi upstream from Crow Creek, 37.9 mi upstream from Peoria Lock and Dam, and at mile 195.7.

DRAINAGE AREA - 13,544 mi². does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.

REVISIONS HISTORY -

From 5/23/23 to 6/21/23, the turbidity record was revised due to a multipoint correction not being applied to the data to compensate for a decodes issue with the decimal place causing the turbidity readings being off by a factor of 10.

From 5/10/23 to 5/23/23, the chlorophyll-a record was revised due to some bad data not being deleted that had flatlined at zero.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: October 1981 to current. Prior to October 1983, published as station number
    "05558900."
  STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
  SEDIMENT: October 1983 to September 1986, May 1993 to September 1993.
  MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish
    tissue, October 1996.

WATER TEMPERATURE: June 6, 2018 - present.
SPECIFIC CONDUCTANCE: June 6, 2018 - present.
PH: June 6, 2018 - present.
DISSOLVED OXYGEN: June 6, 2018 - present.
CHLOROPHYLL-A: June 6, 2018 - present.
BLUE-GREEN ALGAE: June 6, 2018 - present.
TURBIDITY: July 28, 2022 - present
CO2: March 23, 2022 - present

GAGE - U.S. Army Corps of Engineer's water-stage recorder and satellite telemeter, acoustic-velocity meter, and a crest-stage gage. Datum of gage is 425.85 ft above NAVD of 1988. October 12, 2007, to May 23, 2023, at site 1900 feet downstream, at same datum.

REMARKS - Some regulation by locks and dams upstream from station at Starved Rock and downstream at Peoria. Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.

EXTREMES OUTSIDE PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Flood of Mar. 22, 1979, reached a stage of 32.67 ft, discharge about 140,000 ft³/s, based on rating curve extended above 32.20 ft, from information obtained from the U.S. Army Corps of Engineers.

EXTREMES FOR PERIOD OF RECORD -

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 161,000 ft³/s, April 20, 2013, gage height 30.86 ft; maximum gage height 32.94 ft, April 22, 2013, discharge unknown; minimum daily discharge, 1,050 ft³/s, March 3, 2015.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 324 mg/L, June 11, 1993; minimum daily mean, 19 mg/L, May 2, 1993.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 52,800 tons, June 11, 1993; minimum daily, 1,600 tons, June 2, 1993.

WATER TEMPERATURE: maximum, 31.79 oC, July 8, 2020; minimum, 0.01 oC, Feb. 26, 2021.
SPECIFIC CONDUCTANCE: maximum, 1073 uS/cm, Feb. 1, 2020; minimum, 361 uS/cm, Sept. 30, 2019.
PH: maximum, 9.01, June 22, 2021; minimum, 7.42, Oct. 27, 2021.
DISSOLVED OXYGEN: maximum, 21.5 mg/L, Feb. 13, 2022; minimum, 1.34 mg/L, Sept. 2, 2020.
CHLOROPHYLL-A: maximum, 99.45 ug/L, Sept. 11, 2020; minimum, 4.51 ug/L, June 04, 2019.
PHYCOCYANIN: maximum, 9.09 ug/L, June 23, 2021; minimum, 0.0 ug/L, Sept. 22, 2019
TURBIDITY: maximum, 158 FNU, Sept. 1, 2022; minimum, 12.5 FNU, Sept. 3, 2022.
CO2: maximum, [ ] ppm, [date]; minimum, [ ] ppm, [date].