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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
05550000 FOX RIVER AT ALGONQUIN, IL
LOCATION - Lat 42°09'58.7", long 88°17'25.2" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 NW 1/4 sec.34, T.43 N., R.8 E., McHenry County, IL, Hydrologic Unit 07120006, on right bank 20 ft upstream from bridge on State Highway 62 (Algonquin Road) in Algonquin, 140 ft upstream from Algonquin Dam, and at mile 81.6.
DRAINAGE AREA - 1,403 mi².
REVISIONS HISTORY - WSP 1175: 1916. WDR IL-75-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1915 to September 2009.
Monthly discharge only for some periods, published in WSP 1308.
STAGE: Water years 1994 to current.
BIOLOGICAL
ALGAE: Water years 1989-90.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1915 to September 2009.
Monthly discharge only for some periods, published in WSP 1308.
STAGE: Water years 1994 to current.
BIOLOGICAL
ALGAE: Water years 1989-90.
GAGE - Water-stage recorder, satellite telemeter, and concrete dam with adjustable gate. Datum of gage is 729.21 ft above NAVD of 1988. Prior to Oct. 20, 1933, non-recording gage at site 20 ft downstream at same datum.
REMARKS - Stage regulated by Stratton Lock and Dam (previously known as McHenry Dam).
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,720 ft³/s, May 22, 2004 and Aug. 25, 2007, gage heights 3.09 ft and 3.50 ft respectively, due to regulation; maximum gage height, 4.50 ft, April 1, 1916; from graph based on gage readings; Minimum discharge, no flow, Nov. 26, 1952, Nov. 20, 1953, Oct. 25, 1956 and Sept. 9, 14, 1958, result of windstorm.
