Madison County has effective floodplain maps since December 18, 2024. Please coordinate with the local floodplain administrators for more information.
Broadwater County has effective floodplain maps on the Jefferson River sinceSeptember 26, 2024. Please coordinate with the local floodplain administrator for more information.
Madison, Jefferson, Gallatin, and Broadwater Counties have been working with the Federal Emergency Management Agency (FEMA) and Montana Department of Natural Resources and Conservation (DNRC) to produce new floodplain maps for portions of the Madison, Ruby, Jefferson, Beaverhead and South Boulder Rivers, and Mill and Indian Creeks. See project extents here.
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 and Madison County flood prone maps are based on data from the 1980s and 1990s.
View Draft Maps
*please be patient while the data loads on the viewer*
Draft or preliminary maps and studies need to go through a lengthy technical and public review process. When finalized, new maps could have effects on some property owners in mapped 100-year floodplains. Click on your county below to learn about the floodplain designations referenced on the maps, community meetings, and other information:
Past Open House Meetings:
March 9, 2021 | Madison River | view slides view video recording
March 10, 2021 | Jefferson River & S. Boulder R. | view slides view video recording
Flood Insurance Information:
- 100-Year Floodplain (1% Annual Chance Flood)
- Floodway Area (within a 100-Year Floodplain)
- 500 Year Floodplain
For additional questions contact your local floodplain administrator.
Gallatin County
Sean O'Callaghan
sean.ocallaghan@gallatin.mt.gov
(406) 582-2280
City of Three Forks
Kelly Smith
ksmith@threeforksmontana.us
(406) 285-3431
Tentative Project Timeline
