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GIS Maps 

The following maps are produced using Geographic Information System Technology. For Interactive Maps, see the OWR Publications Page.


Illinois Public Waters 
Public Waters are defined as all lakes, rivers, streams and waterways which are or were navigable and are open or dedicated to public use including all bayous, sloughs, backwaters and submerged lands connected by water to the main channel or body of water during normal flows or stages. The Public Waters shown on this map are identified in 17 Ill. Adm. Code, Chapter I, Section 3704, Appendix A Public Bodies of Water.  Click on the map for a full and printable view.

 
 
100-Year Floodplain in Illinois  
The 100-year floodplain represents that portion of the topography that would be inundated during a flood event which has a 1% chance of occurrence in any given year. The mapped 100-year floodplain area represents the best available data as of July 2009.  Click on the map for a full and printable view.


Stream Gages in Illinois  
Stream gages monitor streams and collect information such as water height and discharge. This information is useful for flood prediction, water management, recreation and navigation purposes. The location of stream gages maintained by the USGS and IDNR Office of Water Resources are shown on this map. The map also shows the stream gages in relation to the underlying topography, major watershed boundaries and streams.  Click on the map for a full and printable view.
Levees in Illinois  
Levees are usually earthen embankments that contain, control, or divert the flow of water to provide some level of protection from flooding. Levees in this map were located based on information from the US Army Corps of Engineers and IDNR Office of Water Resources.