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DESCRIPTION:

Latitude 41°41'47",   Longitude 87°56'30"   NAD83

Cook County, Illinois, Hydrologic Unit 07120004

Drainage area: 391.4 square miles

Datum of gage: 551.76 feet above   NAVD88.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Field measurements	1976-06-01	2013-07-26	55
Field/Lab water-quality samples	1978-09-21	2023-07-10	245
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