Jefferson County Flood Maps Update

UPDATE August 2025

The Formal 90 day appeal and comment period will begin September 10, 2025 and will run through December 9, 2025.

To learn more about this formal process please review the documents below.

The formal 90-day appeal and comment period is ran through the community offices. All submittals must include a completed appeal / comment form. Please contact your local floodplain administrator in Jefferson County, Boulder or Whitehall for more information. 

Jefferson County appeal form

Boulder appeal form

Whitehall appeal form

Jefferson County has been working with the Federal Emergency Management Agency (FEMA) and Montana Department of Natural Resources and Conservation (DNRC) to produce new and updated 100-year floodplain maps.  The project includes updating all the existing mapped floodplains in the county, and producing new floodplain maps for portions of Prickly Pear Creek and tributaries in the northern part of the county.  

Updated floodplain maps will depict the latest, most accurate flood risk data, and will eventually result in updated FEMA floodplain maps. Most of the existing FEMA floodplain maps in Jefferson County are based off of data from the 1970s.  For more information see:  Floodplain FAQs  Flood Study Process

*please be patient while the data loads on the viewer*

The draft study information and maps need to go through a lengthy technical and public review process before being finalized.  When finalized, new maps could have effects on some property owners in mapped floodplains.

Flood Insurance Information:

We will update this website with new, relevant information as it is available.

Know your property's flood risk

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

New floodplain studies involve collecting and analyzing data, including: topography, hydrology analyses and hydraulic analysis.

For more information on the project please contact the local floodplain administrators. 

Jefferson County

LaDana Hintz
lhintz@jeffersoncounty-mt.gov
(406) 225-4040

Town of Boulder

Brian Bullock
cityadministrator@cityofbouldermt.com
(406) 225-9629

Town of Whitehall

Sara Unruh
clerk2@townofwhitehall.org
(406) 287-3972