These data were extracted from the primary public land survey data set in the ISGS GIS database. Attribute data identify township and range. Electrical Transmission Lines and Pipelines Major electrical transmission lines and pipelines for Illinois. Wells and Borings Locations, well type and identification for over 370,000 wells and borings in Illinois. Data are also available for entire state as of December, 1995.
Data comes from driller's logs, engineering boring logs, etc.
Illinois Wetlands Inventory - Lines Wetlands and deepwater habitats of Illinois in the 1980's based on US Fish and Wildlife Service definitions. Many farmed wetlands were not digitized. Illinois Wetlands Inventory - Points Wetlands and deepwater habitats of Illinois in the 1980's based on U.S. Fish and Wildlife Service definitions. Many farmed wetlands were not digitized. Illinois Wetlands Inventory - Polygons Wetlands and deepwater habitats of Illinois in the 1980's based on U.S. Fish and Wildlife Service definitions.