LOCATION.-- Lat 41°32'44", long 87°33'32" (NAD of 1983), in SE1/4SE1/4 sec.1, T.35 N., R.14 E., Cook County, Hydrologic Unit 07120003, on right bank at downstream side of bridge on Torrence Avenue, 1.1 mi south of Lansing, 2.7 mi north of U.S. Highway 30, and at mile 5.1.

DRAINAGE AREA.-- 16.8 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: May 1948 to September 1979. Prior to October 1974, records published with those for streams in the St. Lawrence River basin (WSP 1307, 1727, 1911, 2111, WDR IL 1971-74).

REVISED RECORDS.-- WSP 1337: 1948(M). WDR IL-75: Drainage area.

GAGE.-- Water-stage recorder. Datum of gage is 599.29 ft above NGVD of 1929 (598.97 ft NAVD 1988). Prior to Dec. 16, 1948, nonrecording gage at same site and datum.

REMARKS.-- Some diurnal fluctuation caused by pumping operations above the station.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 692 ft³/s Oct. 10, 1954, gage height, 8.96 ft; no flow at times in several years.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of Mar. 20, 1948, reached a stage of 8.51 ft, from floodmark, discharge, 730 ft³/s.