USGS Water-Year Summary for Site 05550001

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)

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

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USGS Water-Year Summary 2024

05550001 FOX RIVER (TAILWATER) AT ALGONQUIN, IL

LOCATION - Lat 42°09'43", long 88°17'38" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 NW 1/4 sec.34, T.43 N., R.8 E., McHenry County, IL, Hydrologic Unit 07120006, on right bank 1,830 ft downstream from bridge on State Highway 62 (Algonquin Road) in Algonquin, 1,730 ft downstream from Algonquin Dam, and at mile 81.2.

DRAINAGE AREA - 1,429 mi². Site prior to October 2009; 1,403 mi².

REVISIONS HISTORY - WSP 1175: 1916 (site 05550000). WDR IL-75-1: Drainage area (site 05550000).

SURFACE-WATER RECORDS

PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: October 1915 to current. Prior to October 2009,
    published as site 05550000. Monthly discharge only for some periods, published in WSP 1308.
  STAGE: October 2002 to current.
SURFACE-WATER QUALITY
  SPECIFIC CONDUCTANCE: June 2016 to current.
  WATER TEMPERATURE: June 2016 to current.
  DISSOLVED OXYGEN: June 2016 to current.
  PH: June 2016 to current.

GAGE - Water-stage recorder, satellite telemeter, and water quality monitor. Datum of gage is 719.22 ft above NAVD of 1988. Prior to Oct. 20, 1933, non-recording gage at site 1,880 ft upstream at same datum. October 20, 1933 to September 30, 2009, recording gage at site 1,900 ft upstream at same datum, discharge published as Fox River at Algonquin (05550000). Discharges are considered equivalent. October 1, 2009 to September 30, 2012, recording gage at site 1,590 ft upstream at same datum.

REMARKS - Flows regulated by gate in Algonquin Dam. Adjustable gate installed in Algonquin Dam during 2002. Stratton Lock and Dam (previously known as McHenry Dam) 16 mi upstream from station. 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, 7,900 ft³/s, July 23, 2017, gage height 13.18 ft; no flow November 26, 1952, November 20, 1953, October 25, 1956 and September 9, 14, 1958; result of windstorm, site then in use.
WATER TEMPERATURE: Maximum, 30.0oC, July 27-28, 2016; Minimum, 4.6oC, Nov. 22 & 26, 2016.
SPECIFIC CONDUCTANCE: Maximum, 1310 uS/cm at 25oC, June 14, 2017; minimum, 442 uS/cm at 25oC, July 17, 2017.
DISSOLVED OXYGEN: Maximum, 14.9 mg/L, Aug 8, 2017; minimum, 3.46 mg/L, Jul. 27, 2017.
PH: Maximum, 8.9 standard units, July 1, Aug. 29-30, Sept. 1 2016 and Aug. 28, 2017; minimum, 7.5, July 16, 2017.