LOCATION.-- Lat 42°12'34", long 87°57'18" (NAD of 1927), in NW1/4NE1/4 sec.16, T.43 N., R.11 E., Lake County, Hydrologic Unit 07120004, on right bank at downstream side of bridge on Prairie Road, 1 mi north of Prairie View, and at mile 2.4.

DRAINAGE AREA.-- 36.0 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1989 to September 1996.

STAGE: Water years 1994-1996.

PARTIAL RECORD: Annual maximum, October 1961 to September 1976.

REVISED RECORDS.-- WDR IL-77-1: 1961-76(M).

GAGE.-- Water-stage recorder and crest-stage gage. Datum of gage is 658.00 ft above NGVD of 1929. Prior to Apr. 18, 1973, crest-stage gage at datum 5.01 ft higher. Apr. 18, 1973, to Oct. 4, 1989, crest-stage gage at datum 4.51 higher.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 815 ft³/s Feb. 20, 1994, gage height, 5.72 ft; minimum discharge, 0.14 ft³/s Aug. 28, 30 to Sept. 2, 1991.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of Mar. 30, 1960, reached a stage of 6.73 ft, present datum, from floodmark, discharge 1,410 ft³/s.