USGS Water-Year Summary 2021
05535500 WEST FORK OF NORTH BRANCH CHICAGO RIVER AT NORTHBROOK, IL
LOCATION - Lat 42°08'18", long 87°50'05" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 sec.4, T.42 N., R.12 E., Cook County, IL, Hydrologic Unit 07120003, on upstream side of bridge on State Highway 68 at Northbrook, and at mile 7.9.
DRAINAGE AREA - 11.5 mi².
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: August 1952 to current.
STAGE: Water years 1994 to current.
GAGE - Water-stage recorder, satellite telemeter, and crest-stage gage. Datum of gage is 637.98 ft above NGVD of 1929 (Cook County Highway Department bench mark) (637.75 ft NAVD 1988). Effluent from sewage-treatment plant 1.7 mi upstream averages about 5 ft³/s.
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,190 ft³/s, August 14, 1987, gage height, 10.10 ft; no flow at times in several years.