LOCATION.-- Lat 42°05'43", long 87°54'46" (NAD of 1927), in SW1/4SE1/4 sec.23, T.42 N., R.11 E., Cook County, Hydrologic Unit 07120004, on left bank at upstream side of bridge on Camp McDonald Road, 2.5 mi northeast of Mount Prospect, and at mile 2.0.

DRAINAGE AREA.-- 7.93 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: August 1952 to current year.

STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WSP 1915: 1958. WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 639.12 ft above NGVD of 1929 (Cook County Highway Department bench mark) (638.87 ft NAVD 1988). Prior to May 9, 1978, at site 55 ft downstream of present location at same datum. May 1978 to Mar. 1994, at present location. Mar. 7 to Sept. 30, 1994, at temporary site 50 ft upstream of present location at same datum. Oct. 1994, moved back to present location.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 806 ft³/s, Aug. 14, 1987, gage height, 8.08 ft; no flow at times in several years.