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Important for you to know:

  • New to WDFN: see current water conditions throughout the state using the new State Pages. Visit the Louisiana page for an example. Filter by continuous data type and age of data, view latest values, and link to graphing options to explore the data further. You can update the state name in the URL to visit your State Page or read our announcement on the Water Data for the Nation blog to find links to all the state and territory pages.
Important Inventory Page

USGS Parameter Group Data Types Start Date End Date
Information Water-quality 1985-10-01 1991-03-27
Inorganics, Major, Metals Water-quality 1985-10-01 1991-03-27
Inorganics, Major, Non-metals Water-quality 1985-10-01 1991-03-27
Inorganics, Minor, Non-metals Water-quality 1985-10-01 1991-03-27
Inorganics, Minor, metals Water-quality 1985-10-01 1991-03-27
Nutrient Water-quality 1985-10-01 1991-03-27
Organics, PCBs Water-quality 1986-07-16 1991-03-27
Organics, other Water-quality 1985-10-01 1991-03-27
Organics, pesticide Water-quality 1985-10-01 1991-03-27
Physical Groundwater Levels, Water-quality 1940-07-01 1991-03-27
Water Data for the Nation inventory

Monitoring location 421640088120001 is associated with a Well in McHenry County, Illinois. Water data back to 1940 are available online.

Metadata Element Location Metadata Metadata Code
Agency
U.S. Geological Survey USGS
Site identification number
421640088120001 n/a
Site name
44N 9E-20.1d1 n/a
Site type
Well
GW
DMS latitude 421640 n/a
DMS longitude 0881200 n/a
Decimal latitude 42.27780069 n/a
Decimal longitude -88.2000831 n/a
Latitude-longitude method
Interpolated from MAP. M
Latitude-longitude accuracy
Accurate to + or - 5 sec. F
Latitude-longitude datum
North American Datum of 1927 NAD27
Decimal Latitude-longitude datum North American Datum of 1983 NAD83
District
Illinois 17
State
Illinois 17
County
McHenry County 111
Country US n/a
Land net location description SWNWNWS21 T 44N R 9E 3 n/a
Name of location map WAUCONDA n/a
Scale of location map 24000 n/a
Altitude of Gage/land surface 760 feet n/a
Method altitude determined Interpolated from topographic map. M
Altitude accuracy 5 feet n/a
Altitude datum
National Geodetic Vertical Datum of 1929 NGVD29
Subbasin hydrologic unit
07120006
Drainage basin
n/a
Topographic setting
Flat surface
F
Flags for instruments at site NNNNNNNNNNNNNNNNNNNNNNNNNNNNNN n/a
Date of first construction
194007 n/a
Date site established or inventoried n/a
Drainage area
n/a
Contributing drainage area n/a
Time Zone abbreviation CST n/a
Site honors Daylight Saving Time
N n/a
Data reliability
Unchecked data. U
Data-other GW files YYYNNYNN n/a
National aquifer Sand and gravel aquifers (glaciated regions) N100GLCIAL
Local aquifer Pleistocene Series 112PLSC
Local aquifer type
n/a
Well depth 122 feet n/a
Hole depth
122 feet n/a
Source of depth data A n/a
Project number 441706200 n/a