UPDATE: Madison County will have effective floodplain maps on December 18, 2024.
UPDATE: Broadwater County will have effective floodplain maps on the Jefferson River September 26, 2024.
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:
July 19, 2023| Twin Bridges| view slides view video recording
July 20, 2023| Ennis | view slides view video recording
March 9, 2021 | Madison River | view slides view video recording
March 10, 2021 | Jefferson River & S. Boulder R. | view slides view video recording
March 11, 2021 | Ruby & Beaverhead Rivers, Sheridan & Twin Bridges | 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
FEMA issued preliminary maps for Madison County on February 26, 2023.
For more information on what it means to own property in the floodplain please look at the flyers below.
- 100-Year Floodplain (1% Annual Chance Flood)
- Floodway Area (within a 100-Year Floodplain)
- 500 Year Floodplain
A formal appeal/comment period was held for Madison County, and the Towns of Ennis, Sheridan, and Twin Bridges from August 24, 2023- November 21, 2023.
Madison County
Cody Marxer County Floodplain Administrator
cmarxer@madisoncountymt.gov
(406) 872-6359
Town of Ennis & Town of Twin Bridges
Jerry Grebenc Towns Floodplain Administrator
jgrebenc@greatwesteng.com
(406) 872-6359
Ennis POC
Susie Sprout
Susies@ennismontana.org
(406) 682-4287
Twin Bridges POC
Kristi Millhouse
Townoftb@3rivers.net
(406) 684-5243
Town of Sheridan
Mayor Judy Wertz Town Floodplain Administrator
sheridanmtmayor@gmail.com
(406) 842-5431
Floodplain Maps will go effective for the County September 26, 2024
Preliminary Floodplain Maps were issued to Broadwater County on October 14, 2022.
For more information on what it means to own property within in the floodplain please see the flyers below.
- 100-Year Floodplain (1% Annual Chance Flood)
- Floodway Area (within a 100-Year Floodplain)
- 500 Year Floodplain
A formal appeal period for the Broadwater County preliminary maps was held between May 5, 2023 and end on August 1, 2023.
For more information on the flood study please contact your local floodplain administrator:
Jerry Grebenc
Broadwater County Floodplain Administrator
(406) 495-6153
Tentative Project Timeline
