LOCATION.-- Lat 41°31'15", long 87°35'25" (NAD of 1927), in SE1/4NW1/4 sec.14, T.35 N., R.14 E., Cook County, Hydrologic Unit 07120003, on left bank at downstream side of bridge on Joe Orr Road, 0.4 mi east of Cottage Grove Avenue, 1.0 mi north of U.S. Highway 30, 1.5 mi northeast of Chicago Heights, and at mile 2.8.

DRAINAGE AREA.-- 23.1 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.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 615.95 ft above NGVD of 1929. See WSP 1707 or 1727 for history of changes prior to Aug. 13, 1958.

REMARKS.-- Undetermined amount of flow diverted for irrigation upstream from the gage.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,380 ft³/s, July 13, 1957, gage height, 11.75 ft; maximum gage height, 11.79 ft, Nov. 28, 1990, discharge, 809 ft³/s; no flow at times in several years.