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Groundwater levels for the Nation

! Important: Next Generation Monitoring Location Page

USGS 401509089540401 21N 7W-21.7h

Mason County, Illinois
Latitude  40°15'37", Longitude  89°53'57" NAD27
Land-surface elevation 499 feet above NGVD29
The depth of the well is 115 feet below land surface.
The depth of the hole is 115 feet below land surface.
This well is completed in the Sand and gravel aquifers (glaciated regions) (N100GLCIAL) national aquifer.
This well is completed in the Quaternary System (110QRNR) local aquifer.

Period of record
Begin Date End Date Levels
1988-10-21 1988-10-21 1

 
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