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Water-Year Summary for Site 04087440

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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Available Parameters
00065 Gage height(Mean)  

Water year 2021: 2020-10-01 to 2021-09-30
 

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USGS Water-Year Summary 2021
04087440 LAKE MICHIGAN AT CHICAGO LOCK AT CHICAGO, IL
LOCATION - Lat 41°53'18", long 87°36'27" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 SE 1/4 sec.10, T.39 N., R.14 E., Cook County, IL, Hydrologic Unit 04060200, on the lake side of the downstream right guidewall, approximately due North of the riverside gates of the Chicago Lock.
DRAINAGE AREA - Indeterminate.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
STAGE: August 1997 to September 2003 and October 2007 to current.
GAGE - Water-stage recorder and cellular telemeter. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City Datum) (579.19 ft NAVD 1988).
EXTREMES FOR PERIOD OF RECORD -
STAGE: Maximum gage height, 5.32ft, May 17, 2020; minimum, -4.07 ft., Jan. 18, 2013, may be exaggerated by wave action.