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Use these indexes to find specific DFIRM maps in the list below. For a larger map, click the map itself. 

The Federal Emergency Management Agency (FEMA) adopted new Flood Insurance Rate Maps (FIRMs) for Missoula County on October 5, 2023. You can obtain the most recent floodplain maps in one of the following ways:

• View online here by clicking FEMA Digital Flood Insurance Rate Maps (DFIRM).
• Request an electronic copy from the Planning, Development and Sustainability Office.
• View and print maps from FEMA's map center.
• FEMA's Revalidation Letter lists Letter of Map Change (LOMC) issued under older floodplain maps and reaffirmed for the July 6, 2015 DFIRM. The Revalidation Letter does not list LOMCs that have been incorporated, superseded by new or revised mapping or no longer valid. The Revalidation Letter is considered legally binding, in the same manner as an original LOMR-F or LOMA, provided that a copy of the original determination accompanies the Revalidation Letter.
• On April 5, 2023, FEMA issued an updated Final Summary of Map Actions (SOMA) that describes the effects of revised FIRM Panels for the Clearwater River on previously issued Letter of Map Change (LOMC) actions, Effective on October 5, 2023. The SOMA letter is available here:  Final Summary of Map Actions
• FEMA has revalidated the previous Letter of Map Revision (LOMR) which amended the floodplain maps for the Blackfoot and Clark Fork Rivers following the removal of Milltown and Stimson Dams effective July 29, 2015. For additional information please contact the floodplain administrator or review the LOMR here and here.

Flood Insurance Study

The Flood Insurance Study (FIS) is a narrative report of Missoula County's flood hazards. Flood profiles within the FIS may be used to obtain the detailed base flood elevation at a specific site and also the predicted elevation for other flood events. Information contained in the FIS includes:

• Description of the areas studies and the engineering methods used
• Past flooding information
• Graphic profiles of the flood source
• Other pertinent information

Download the Flood Insurance Study

• Flood Insurance Study 1 of 3 (October 5, 2023)
• Flood Insurance Study 2 of 3 (October 5, 2023)
• Flood Insurance Study 3 of 3 (October 5, 2023)

FEMA's original 2019 Digital Flood Insurance Rate Map (DFIRM) GIS data may be downloaded here - search for Missoula:  FEMA's map center