05536357 CALUMET RIVER BELOW O'BRIEN LOCK AND DAM AT CHICAGO, IL
LOCATION.--Lat 41°38'53", long 87°33'50", in SE¼SE¼ sec.36, T.37 N., R.14 E., Cook County, Hydrologic Unit 07120003,
on right bank, 0.7 mi downstream of 130th Street in Chicago, and 1100 ft below the downstream lock
gates at the Thomas J. O'Brien Lock and Dam, and at mile 6.9.
DRAINAGE AREA.--Indeterminate.
PERIOD OF RECORD.--October 1996 to current year.
GAGE.--Acoustical flowmeter. Datum of gage is 579.48 ft above sea level (Chicago City datum).
REMARKS.--This gaging station provides flow data to determine Illinois' diversion of Lake Michigan water. A U.S.
Supreme Court Decree limits Illinois' diversion to an average of 3,200 ft3/s. Illinois' diversion includes
water diverted from the lake for domestic water supply, for navigation, and water-quality improvement in the
Chicago Sanitary and Ship Canal system, and stormwater runoff from a 673 mi2 diverted watershed area.
Gage-height telemeter at station.