LaSalle County Flood Hazard Information

Effective Map Products

Effective Flood Insurance Rate Maps for LaSalle 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

Discovery Meeting(s)

  • Lower Fox Watershed Discovery
  • Inundation Map of the Illinois River at Ottawa, IL

  • Additional Resources

  • Floodplain Mapping 101
  • Destined for DFIRMs - stream studies becoming flood maps
  • Building Footprints
  • Topographic Wetness Index
  • Links to National Flood Insurance Program (NFIP) Information