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Gallatin Mapping Updates

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Gallatin County has been working with the Federal Emergency Management Agency (FEMA) and Montana Department of Natural Resources and Conservation (DNRC) to update Flood Insurance Rate Maps for the West Gallatin River and Bozeman Creek and its tributaries.  New Flood Insurance Rate Maps from this project  will go into effect on April 21, 2021.   

When finalized, the new maps could have effects on some property owners in mapped floodplains. If you are currently or will be mapped into a 100-Year Floodplain, see the 100-Year Floodplain link to understand what this means. 

Finalizing the Maps and Study

Revised Flood Insurance Rate Maps from this project will go into effect on April 21, 2021.  The revised maps and study information are available on the Maps & Technical Reports page and on FEMA's Map Service Center website.  

Letter of Map Amendment (LOMA) or Letter of Map Revision Based on Fill (LOMR-F)

Limitations in the scale or topographic detail of Flood Insurance Rate Maps may cause small elevated areas to be included in a mapped 100 year floodplain.  To request an official flood hazard determination for these small areas, FEMA provides the Letter of Map Amendment (LOMA) process for buildings (or areas) on naturally high ground, and the LOMR-F process for buildings (or areas) elevated by the placement of fill. 

LOMA or LOMR-F requests based on the new revised maps can be submitted to FEMA starting March 21, 2021 (30 days prior to the effective date of April 21, 2021).   FEMA recommends using the Online LOMC application form, and including a note that you are requesting a determination based on the new revised maps.   

For more information see:
How to Apply   (include a note that you are requesting a determination based on the new maps)
LOMA EZ Application form and instructions
LOMA/LOMR-F Application form and instructions

View Revised Floodplain Maps


FEMA issued Preliminary Flood Insurance Rate Maps for this project in November 2016. A Revised Preliminary Flood Insurance Rate Map Panel #30031C0790E was issued on 2/16/18 to replace the initial Preliminary Flood Insurance Rate Map Panel.  A 90-day Appeal and Comment period on the preliminary maps and study was held in late 2018. Revisions to 8 map panels were made in 2020 based on submitted comments and appeals.  

The map viewer above shows the revised, updated mapping that will go into effect on 4/21/21.  You can also view the revised maps on the Maps & Technical Reports page. Get more information on floodplain designations referenced on the maps:

Newly Mapped into a 100-Year Floodplain? See Low Cost Insurance Options

Public Meetings Held

Gallatin County, the City of Bozeman, Montana DNRC, and FEMA hosted several Public Open Houses in January 2016 and in January 2017 to review the draft maps and Preliminary Flood Insurance Rate Maps and talk with property owners one-on-one about the proposed floodplain map changes.

An additional open house was held in March 2018 for landowners in the revised area of the West Gallatin River near Shed's bridge.

Come back for more information

We will update this website with new, relevant information as the Gallatin County Flood Insurance Rate Map adoption process progresses. Also, visit the links on the right side of the page, including our Floodplain FAQs link, for more in-depth information.

Know your property's flood risk

Flood Insurance Rate Maps indicate areas of increased flood risk. Once this project is complete, Gallatin County Flood Insurance Rate Maps will provide more accurate, current, and detailed data and mapping of flood risk areas.  

If your house or building will be newly mapped into a 100-year floodplain, click here: Low Cost Insurance Options

Obtain Technical Data

Technical data for the West Gallatin and Bozeman Creek and tributaries floodplain mapping project is available for download on the City of Bozeman's file share site.  Data including hydrologic analyses, flood profiles, floodway data tables, and HEC-RAS modeling files are available.  Contact the City of Bozeman Engineering Department if you have trouble accessing the file share site.


More Info 

Maps & Technical Reports
Gallatin Floodplain FAQs 


Contact the County

Gallatin County Planning 
(406) 582-3130

Stay Updated

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