USGS Water-Year Summary for Site 05543010

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	32318 Chlorophylls,in situ(Mean,Min.,Max.)
	32319 fPC, water, in situ(Max.,Mean,Min.)
	63680 Turbidity, Form Neph(Max.,Min.,Mean)
	99133 NO3+NO2,water,insitu(Max.,Min.,Mean)

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

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USGS Water-Year Summary 2024

05543010 ILLINOIS RIVER AT SENECA, IL

LOCATION - Lat 41°17'59.6", long 88°36'51.1" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 SE 1/4 sec.26, T.33 N., R.5 E., LaSalle County, IL, Hydrologic Unit 07120005, on concrete mooring dolphin in river at Seneca, 0.3 miles downstream from highway 170, 5.9 miles upstream from Marseilles Lock and Dam, 20 miles downstream from Kankakee River, and at mile 252.5.

DRAINAGE AREA - 8,215 mi².

REVISIONS HISTORY - Revisions: Gage datum was updated to 462.58 ft NAVD88 on May 30, 2023, based on GNSS Level II survey using GEOID18.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  STAGE: July 2013 to current.
SURFACE WATER QUALITY
  CHEMICAL: April 1979 (bed material analysis).
  WATER TEMPERATURE: October 2012 to current.
  SPECIFIC CONDUCTANCE: June 2013 to current.
  DISSOLVED OXYGEN: June 2013 to current.
  PH: June 2013 to current.
  TURBIDITY: June 2013 to current.
  NITRATE: July 2013 to current.
  BLUE-GREEN ALGAE: June 2013 to current.
  CHLOROPHYLL: June 2013 to current.

GAGE - Water-stage recorder, satellite telemeter, crest-stage gage, and water-quality monitor. Datum of gage is 462.58 ft above NAVD of 1988

REMARKS - Stage is regulated by Marseilles Lock and Dam 5.9 miles downstream. Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.

EXTREMES FOR PERIOD OF RECORD -
STAGE: Maximum gage height, 33.25 ft., May 19, 2020; minimum, 18.99 ft, December 2, 2018.
WATER TEMPERATURE: Maximum, 32.7 oC, July 20, 2013; minimum, 0.0 oC, several days in most years.
SPECIFIC CONDUCTANCE: Maximum, 1390 uS/cm at 25oC, December 27, 2013; minimum, 332 uS/cm at 25oC, Sept. 28, 2019.
DISSOLVED OXYGEN: Maximum, 15.4 mg/L, February 28, 2015; minimum, 2.92 mg/L, Sept. 5, 2021.
PH: Maximum, 8.9 standard units, April 30, 2018; minimum, 7.2 standard units, June 2-3, 2016.
TURBIDITY: Maximum, 1057 FNU, July 12, 2021; minimum, 0.01 FNU, Nov. 9, 2020.
NITRATE: Maximum, 10.8 mg/L, June 12, 2014; minimum, 1.92 mg/L, February 25, 2014.
BLUE-GREEN ALGAE: Maximum, 121 ug/l, November. 21, 2014; minimum, 0.00 ug/l, several days during 2014.
CHLOROPHYLL: Maximum, 72.8 ug/l, Aug. 06, 2019; minimum, 1.32 ug/l, Nov. 8, 2017.