LOCATION.-- Lat 42°12'40", long 88°10'25" (NAD of 1983), in NE1/4NW1/4 sec.15, T.43 N., R.9 E., Lake County, Hydrologic Unit 07120006, on left bank at upstream side of bridge on Kelsey Road, 2.5 mi northeast of Fox River Grove, and at mile 1.1.

DRAINAGE AREA.-- 37.0 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1989 to September 1996.

STAGE: Water years 1994-1996.

PARTIAL RECORD: Annual maximum, water years 1962 to 1976; Miscellaneous discharge measurements, water year 2000.

SURFACE-WATER QUALITY

MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000.

BIOLOGICAL

ALGAE: Water year 2000.

BENTHIC MACROINVERTEBRATES: Water year 2000.

FISH: Water year 2001.

HABITAT: Water year 2000-01.

REVISED RECORDS.-- WDR IL-77-1: 1972-76(M).

GAGE.-- Water-stage recorder and crest-stage gage. Datum of gage is 738.00 ft above NGVD of 1929 (737.79 ft NAVD 1988). Prior to Oct. 1, 1989, crest-stage gage at datum 3.44 ft higher.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 690 ft³/s, May 21, 1996, gage height, 5.88 ft; minimum discharge, 1.1 ft³/s, Sept. 19-21, Oct. 30,31, 1994.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of April 1960 reached a stage of 6.36 ft, present datum, discharge, 492 ft³/s.