|
Ground-water level graphs for 4 U.S. Geological Survey ground-water observation-well sites in
the northern, central, and southwestern parts of the State of Illinois are presented here.
Ironton-Galesville aquifer (deep part of Cambrian-Ordovician aquifer system)--UPDATED QUARTERLY
(USGS 422803087475304)
Located in Lake County in northern Illinois. Depth of the well is 1203 feet.
Period of record is 1981 to present.
Visit the web site for these water-level data
Glacial drift aquifer--UPDATED DAILY
(USGS 402558087351501).
Located in Vermilion County in central Illinois. Depth of well is 146 feet.
Period of record is 1993 to present.
Visit the web site for these water-level data
Glacial drift aquifer (Glasford Formation)--UPDATED MONTLY AFTER 2005
(USGS 400658088133101)
Located in Champaign County in central Illinois. Depth of well is 160 feet.
Period of record is 1997 to present.
Visit the web site for these water-level data
Mississippi River valley alluvial aquifer--UPDATED QUARTERLY
(USGS 384659090003701)
Located in Madison County in southwestern Illinois. Depth of well is 43.5 feet.
Period of record is October 2004 to present.
Visit the web site for these water-level data--periodic
Visit the web site for these water-level data--continuous
| 
