cook County Flood Hazard Information


Effective Map Products

Effective Flood Insurance Rate Maps for cook County may be viewed and/or downloaded at the FEMA Flood Map Service Center (MSC)

NFHL Viewer (more detailed flood data displays when zoomed in). It may also be slow.

Launch full screen NFHL Viewer



Preliminary Map Products

2019 Preliminary FIRMs, FIS, and FIRM database for panels under revision are available to download from the FEMA MSC


  • Preliminary Changes Since Last FIRM (CSLF) Viewer
  • Chicago River Watershed Discovery
  • Des Plaines Watershed Discovery
  • Lower Fox Watershed Discovery
  • Upper Fox Watershed Discovery
  • Draft Cook County Total Wetness Index Geodatabase

  • Additional Resources

  • Unmapped Special Flood Hazard Areas (SFHA) (pdf)
  • Destined for DFIRMs - stream studies becoming flood maps
  • Building Footprints
  • Topographic Wetness Index
  • Links to National Flood Insurance Program (NFIP) Information