USGS Water-Year Summary for Site 05549500

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

05549500 FOX RIVER NEAR MCHENRY, IL

LOCATION - Lat 42°18'36", long 88°15'05" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 NW 1/4 sec.12, T.44 N., R.8 E., McHenry County, IL, Hydrologic Unit 07120006, on right bank of main channel, 300 ft upstream from Stratton Lock and Dam, 2.5 mi downstream from McHenry, and at mile 97.8.

DRAINAGE AREA - 1,250 mi².

REVISIONS HISTORY - WDR IL-75-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

SURFACE-WATER DISCHARGE AND STAGE
  STAGE: June 1941 to current.
  PARTIAL RECORD: Miscellaneous discharge measurements, 1985, 1986, 1990, 1993, 2002 to
    2004 and 2006, 2008-2009.

SURFACE-WATER QUALITY
SPECIFIC CONDUCTANCE: Aug. 2018 to current.
  WATER TEMPERATURE: Aug. 2018 to current.
  DISSOLVED OXYGEN: Aug. 2018 to current.
  PH: Aug. 2018 to current.
  TURBIDITY: Aug. 2018 to current.
  BLUE-GREEN ALGAE: Aug. 2018 to current.
  CHLOROPHYLL-A: Aug. 2018 to current.

GAGE - Water-stage recorder and satellite telemeter. Datum of gage is 732.83 ft above NAVD of 1988. Prior to Oct. 1, 1971, at datum 2.07 ft higher.

REMARKS - Stage regulated by Stratton Lock and Dam (previously known as McHenry Dam).

EXTREMES FOR PERIOD OF RECORD -

STAGE: Maximum gage height, 6.36 ft, present datum, Apr. 5, 1960; minimum, 0.32 ft, present datum, Feb. 6, 1967.

WATER TEMPERATURE: Maximum Water Temperature, 32.0 °C, July 7, 2020; minimum, 0.0 °C on Mar. 19, 2023.

SPECIFIC-CONDUCTANCE: Maximum Specific-Conductance, 1,210 us/cm, Oct. 26, 2022; minimum, 442.1 us/cm, Sept. 16, 2019.

DISSOLVED OXYGEN: Maximum Dissolved Oxygen, 22.6 mg/L, July 13, 2020; minimum, 0.28 mg/L, July 26, 2020.

pH: Maximum pH, 9.20, Jul. 25, 2022; minimum, 6.91, July 25, 2020.

TURBIDITY: Maximum Turbidity, 2,680 FNU, Jun. 16, 2022; minimum, 0.05 FNU, Oct. 9, 2020.

CHLOROPHYLL-A: Maximum Chlorophyll-a, 293 ug/L, Aug. 7, 2022 ; minimum, 0.14 ug/L, April 3, 2019.

Blue-Green Algae: Maximum BGA, 35.29 ug/L, September 13, 2024; minimum, 0.16 ug/L, May 17, 2022.