Floodplain Information


2014-2015 FEMA floodplain map updates                             

New detailed floodplain studies were conducted on portions of the following streams - Swan River at Bigfork, Cow Creek, Whitefish River at Whitefish, Ashley Creek, West Spring Creek & tributaries, and Whitefish River at Kalispell.  The detailed floodplain studies were conducted to replace the existing mapped floodplains in those locations, which were mapped using approximate methods, and called Zone A floodplains.  Detailed floodplain studies involved survey work, hydrologic and hydraulic analyses and mapping.  Some of the other existing Zone A floodplains in the county were refined based on updated, more accurate topographic information.

The proposed changes for the detailed study area and the Zone A refinement areas can be viewed at:


FEMA website with all affected preliminary floodplain maps (by panel number):



FEMA "Letter of Final Determination" May 04, 2015

FEMA "Final Summary of Map Actions" (SOMA) May 01, 2015

FEMA letter regarding 90-day appeal start-Received September 10, 2014

FEMA letter regarding update process, April 22, 2014

FEMA Preliminary Summary of Map Actions (SOMA)


For more information contact:

Tiffany Lyden, DNRC Helena, 406-444-0599  tlyden@mt.gov


Flathead County Planning Department, 406-751-8200

Useful Links

How to Make a FIRMette! Click HERE

FEMA's Map Service Center - www.msc.fema.gov

Answers to Questions About the NFIP - Click HERE

Elevation Certificate - Click HERE

Flood Tools Website - www.floodtools.com

Updated: August 1, 2014