Presented here are maps of each of Illinois’ 102 counties illustrating stream reaches with potential flood risk for which Special Flood Hazard Areas (SFHAs) have not been identified on Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRMs) as of July 1, 2007. Tabular data providing stream names and number of unmapped stream miles are listed here. More on our study approach is listed in the contract report.

Select a county of interest to view and/or download the map. Please see our disclaimer.