USGS Water-Year Summary 2023
414757087490401 SUMMIT CONDUIT AT SUMMIT, IL
LOCATION - Lat 41°47'57", long 87°49'04" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 NW 1/4 sec.12, T.38 N., R.12 E., Cook County, IL, Hydrologic Unit 07120004, Conduit receiving flows from Summit Ditch and East Avenue Ditch, passing under Des Plaines River, and discharging to Chicago Sanitary Ship Canal at river mile 313.3, 0.3 miles northeast of west Lawndale Avenue near Summit, IL.
DRAINAGE AREA - 5.4 square miles.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
 DISCHARGE: October 2010 to February 2013.
GAGE - Water-stage recorder, acoustic-velocity meter, satellite telemeter, and crest-stage gage. Datum of gage is 578.858 ft. above NAVD 1988.
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 220 ft³/s, July 23, 2011, gage height, 6.95 ft; maximum gage height, 7.18 ft, May 29, 2011, discharge, 175 ft³/s; minimum, 0.61 ft³/s, Jan. 23, 2011.