LOCATION.-- Lat 41°31'42", long 87°31'45" (NAD of 1927), at north boundary of sec.17, T.35 N., R.15 E., Cook County, Hydrologic Unit 07120003, on right bank at upstream side of bridge on 202nd Street, 0.2 mi west of Indiana State line, 0.5 mi east of Burnham Avenue, 2 mi south of Lansing, and at mile 2.7.

DRAINAGE AREA.-- 8.84 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: May 1948 to current year. 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).

STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WDR IL-75-1: Drainage area. WDR IL-79-2: 1975-78.

GAGE.-- Water-stage recorder. Datum of gage is 607.16 ft above NGVD of 1929. Prior to Sept. 20, 1948, nonrecording gage at same site and datum.

REMARKS.-- Some diurnal fluctuation caused by pumping operations upstream from station.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 461 ft³/s, May 10 or 11, 1948, gage height, 9.24 ft, from floodmark; maximum gage height, 10.18 ft, Oct. 11, 1954, discharge 302 ft³/s; no flow at times in most years.