LOCATION.-- Lat 41°49'54", long 88°02'51" (NAD of 1927), in SE1/4SW1/4 sec.25, T.39 N., R.10 E., Du Page County, Hydrologic Unit 07120004, on upstream side of bridge on State Highway 56, 2.2 mi northwest of Downers Grove, and at mile 15.0. | |
DRAINAGE AREA.-- 26.6 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1989 to current year. | |
STAGE: Water years 1994 to current year. | |
PARTIAL RECORD: Annual maximum, water years 1961-76. | |
GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 660.00 ft above NGVD of 1929. Prior to July 19, 1989, at datum 12.21 ft higher. | |
REMARKS.-- Diurnal fluctuation at low flow caused by sewage-treatment plants upstream from station. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,720 ft3/s, Aug. 26, 1972, gage height, 16.94 ft; minimum discharge, 3.6 ft3/s, Dec. 19, 1989. | |