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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
05536118 NORTH BRANCH CHICAGO RIVER AT GRAND AVENUE AT CHICAGO, IL
LOCATION - Lat 41°53'30.2", long 87°38'31" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 NW 1/4 sec.9, T.39 N., R.14 E., Cook County, IL, Hydrologic Unit 07120003, on right upstream side of Grand Avenue bridge in Chicago, 0.6 mi upstream from confluence with main stem of the Chicago River, and at mile 36.0.
DRAINAGE AREA - 179 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: July 2002 to September 2010 (discontinued).
STAGE: July 2002 to current.
SURFACE-WATER QUALITY
PHYSICAL AND CHEMICAL: Water years 2002-2005.
WATER TEMPERATURE: September 2002 to September 2010.
Specific Conductance: October 2007 to September 2010.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: July 2002 to September 2010 (discontinued).
STAGE: July 2002 to current.
SURFACE-WATER QUALITY
PHYSICAL AND CHEMICAL: Water years 2002-2005.
WATER TEMPERATURE: September 2002 to September 2010.
Specific Conductance: October 2007 to September 2010.
GAGE - Water-stage recorder, cellular telemeter, acoustic velocity meter and water-temperature/specific conductance sensors. Datum of gage is 579.20 ft above North American Vertical Datum of 1988 and 0.00 ft Chicago City Datum (579.48 ft NGVD29).
REMARKS - Flow is diverted from Lake Michigan and is regulated by the Wilmette Controlling Works upstream and the Chicago River Controlling Works on the main stem of the Chicago River and the Lockport Lock and Dam. The Metropolitan Water Reclamation District of Greater Chicago also discharges wastewater effluent from the Northside Treatment Plant to the North Branch of the Chicago River upstream of the gage.
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 14,100 ft³/s, Aug. 22, 2002, gage height, 3.79 ft; minimum discharge, -1,850 ft³/s, Dec. 31, 2005, due to regulation or bi-directional flows, maximum stage, 5.00 ft, July 24, 2010, discharge, 6,550 ft³/s, minimum stage, -4.43 ft, March 14, 2011, discharge unknown.
WATER TEMPERATURE: Maximum 27.0oC, Aug. 2, 2006; minimum 0.0oC, Dec. 28, 2008 and Jan. 17, 2009.
SPECIFIC CONDUCTANCE: Maximum, 5,420 uS/cm, Feb. 6, 2008; minimum, 264 uS/cm, Sept. 5, 2008.
WATER TEMPERATURE: Maximum 27.0oC, Aug. 2, 2006; minimum 0.0oC, Dec. 28, 2008 and Jan. 17, 2009.
SPECIFIC CONDUCTANCE: Maximum, 5,420 uS/cm, Feb. 6, 2008; minimum, 264 uS/cm, Sept. 5, 2008.
