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Groundwater levels for the Nation

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Agency code = usgs
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  • 401542090004701
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USGS 401542090004701 21N 8W-16.6a

Mason County, Illinois
Latitude  40°15'42", Longitude  90°00'47" NAD27
Land-surface elevation 490 feet above NGVD29
The depth of the well is 20 feet below land surface.
The depth of the hole is 20 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.
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Date Time
?
 
Water-level
date-time
accuracy
?
 
Parameter
code 		Water
level,
feet
below
land
surface		 Water
level,
feet
above
specific
vertical
datum		 Referenced
vertical
datum
?
 
Status
?
 
Method of
measurement
?
 
Measuring
agency
?
 
Source of
measurement
?
 
Water-level
approval
status
1973 Y62610 478.00NGVD291OUSGSSA
1973 Y62611 477.69NAVD881OUSGSSA
1973 Y7201912.00  1OUSGSSA

Explanation
SectionCodeDescription
Water-level date-time accuracyYDate is accurate to the Year
Parameter code62610Groundwater level above NGVD 1929, feet
Parameter code62611Groundwater level above NAVD 1988, feet
Parameter code72019Depth to water level, feet below land surface
Referenced vertical datumNAVD88North American Vertical Datum of 1988
Referenced vertical datumNGVD29National Geodetic Vertical Datum of 1929
Status1Static
Method of measurementOObserved.
Measuring agencyUSGSU.S. Geological Survey
Source of measurementSMeasured by personnel of reporting agency.
Water-level approval statusAApproved for publication -- Processing and review completed.