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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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
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USGS Water-Year Summary 2024
04087440 LAKE MICHIGAN AT CHICAGO LOCK AT CHICAGO, IL
LOCATION - Lat 41°53'21.4", long 87°36'28.6" referenced to North American Datum of 1983, 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.
STAGE: August 1997 to September 2003 and October 2007 to current.
GAGE - Water-stage recorder and cellular telemeter. Datum of gage is 579.20 ft above North American Vertical Datum of 1988 and 0.00 ft Chicago City Datum (579.48 ft NGVD29).
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.
STAGE: Maximum gage height, 5.32ft, May 17, 2020; minimum, -4.07 ft., Jan. 18, 2013, may be exaggerated by wave action.
