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View Preliminary Flood Insurance Rate Maps

As the FEMA Flood Insurance Rate Maps (FIRMs) get updated they will be posted first as Preliminary FIRMs.

Preliminary FIRMs can be viewed at two sites: 

FEMA Preliminary FEMA Map Products  (View map panels)

  • Data by panel as a .pdf (get the panel number from the FIRM Index Map at the bottom of the list.
  • Note - .pdfs are large.  Best saved down then opened in Adobe Acrobat. 
  • Data includes: 
  • Preliminary Flood Insurance Studies as a .pdf
  • Preliminary FIRM data in GIS format

The FEMA Flood Map Changes Viewer (View data interactively)

  • How to use the FMCV  .pdf
  • Note - this data is posted later than the .pdfs at the FEMA Map Products site
  • Data includes: 
  • Preliminary DFIRM Map Data (toggle on/off)
  • Preliminary DFIRM Map Changes (toggle on/off)
  • Pending DFIRM Map (After Appeal Period and before Effective date) (toggle on/off)
  • National Flood Hazard Layer (Effective DFIRM data) (toggle on/off)

FEMA Map Service Center 

  • Effective FIRM data - interactive, by panel or by FIRMette 
  • Effective Flood Insurance Studies
  • Recent Letters of Map Adjustment (LOMC/LOMA) 
  • Historic FIRMS and Flood Insurance Studies 
  • Link to the interactive National Flood Hazard Layer (NFHL) 
  • Link via "All Products" to FIRM data in GIS format

Updates on the release of Preliminary FIRM data is posted at:

Effective Digital Flood Insurance Rate Map data is posted at the Flood Ready Atlas and on the ANR Natural Resources Atlas




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