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Groundwater levels for the Nation

! Important: Next Generation Monitoring Location Page

USGS 415940088043501 41N10E-34.3b1

Cook County, Illinois
Latitude  41°59'40", Longitude  88°04'35" NAD27
Land-surface elevation 780 feet above NGVD29
The depth of the well is 221 feet below land surface.
The depth of the hole is 221 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
1964-12-18 1985-08-23 3

 
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