LOCATION.-- Lat 41°30'50", long 87°38'07" (NAD of 1927), in SE1/4SE1/4 sec.17, T.35 N., R.14 E., Cook County, Hydrologic Unit 07120003, on left bank at upstream side of bridge on Halsted Street, at north edge of Chicago Heights, and at mile 10.8.

DRAINAGE AREA.-- 17.2 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: June 1964 to October 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.-- WDR IL-74: 1968(M). WDR IL-75: Drainage area.

GAGE.-- Water-stage recorder. Datum of gage is 627.70 ft above NGVD of 1929. (Illinois Department of Transportation bench mark). Oct 3, 1961 to June 26, 1964, crest-stage gage at downstream side of bridge at datum 4 ft higher.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,220 ft³/s June 6, 1974, gage height, 8.31 ft; no flow for part of Sept. 11, 1974.