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1539 Eleventh Ave. Helena, MT 59601
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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. FEMA released preliminary maps in 2016.  A comment and appeal period for the preliminary maps was held in late 2018.  New Flood Insurance Rate Maps from this project are expected to be finalized in late 2020.   

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

The 90 day Appeal and Comment period on the preliminary maps and study ended December 18, 2018. All submitted comments and appeals were reviewed and evaluated by FEMA. 

FEMA is currently in the process of incorporating final revisions to the preliminary maps and study based on submitted comments and appeals. When complete, finalized maps and study information will be available here and on FEMA's Map Service Center website.  

At this time, finalized Flood Insurance Rate Maps and a finalized Flood Insurance Study are anticipated to be completed later this year, and go into effect in late 2020. Final dates and relevant updates will be posted as they become available. 

Applying for a 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. 

FEMA can only issue LOMA or LOMR-F determinations based on a current Flood Insurance Rate Map. Because Gallatin County's preliminary maps are not yet effective, LOMA or LOMR-F applications based on the preliminary maps should not be submitted to FEMA until the preliminary maps are finalized and become effective (anticipated in late 2020).  LOMA and LOMR-F applications submitted 30 days prior to the effective date can be reviewed and issued shortly after the new maps go into effect.  

For more information see:
How to Apply
LOMA EZ Application form and instructions
LOMA/LOMR-F Application form and instructions

View Preliminary Floodplain Maps


FEMA issued Preliminary Flood Insurance Rate Maps for this project in November 2016. Early comments prompted a review and revision of one area - the West Gallatin River near Shed's Bridge. 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.  

The map viewer above shows all the preliminary map data, including the revised area.  You can also view the Preliminary and Revised Flood Insurance Rate Map panels by visiting 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.

Join our email list to stay informed on project updates

The process of publicly reviewing and adopting new Flood Insurance Rate Maps will take a couple years. We will keep affected and concerned property owners informed as best we can during this process. If you would like to stay informed on the Flood Insurance Rate Map adoption process via email, please opt in to our email list on the right side of the page. 

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

Subscribe to the Gallatin Flood Insurance Rate Map Updates email list below. 

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