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USGS 04087440 LAKE MICHIGAN AT CHICAGO LOCK AT CHICAGO, IL

  Lake Site

DESCRIPTION:
Latitude 41°53'21.4",   Longitude 87°36'28.6"   NAD83
Cook County, Illinois, Hydrologic Unit 04060200
Datum of gage: 579.20 feet above   NAVD88.
AVAILABLE DATA:
Data Type Begin Date End Date Count
 Current / Historical Observations     (availability statement)    2007-10-01  2025-09-27  
 Daily Data
    Gage height, feet  1997-08-15  2025-09-26  8539 
 Daily Statistics 
    Gage height, feet  1997-08-15  2025-07-28 8479 
 Monthly Statistics 
    Gage height, feet  1997-08  2025-07  
 Annual Statistics 
    Gage height, feet  1997  2025  
 Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP) 2005-12-19  2005-12-19  1 
 Water-Year Summary 2008  2024  17 
 Revisions  Loading...
OPERATION:
Record for this site is maintained by the USGS Illinois Water Science Center
Email questions about this site to Illinois Water Science Center Water-Data Inquiries