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Groundwater levels for the Nation

! Important: Next Generation Monitoring Location Page

USGS 412858087441201 35N13E-33.2h1

Cook County, Illinois
Latitude  41°28'58", Longitude  87°44'12" NAD27
Land-surface elevation 732.5 feet above NGVD29
The depth of the well is 418 feet below land surface.
The depth of the hole is 418 feet below land surface.
This well is completed in the Silurian-Devonian aquifers (N400SLRDVN) national aquifer.
This well is completed in the Silurian System (350SLRN) local aquifer.

Period of record
Begin Date End Date Levels
1969-02-06 1985-05-30 30

 
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