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DNRC Headquarters
1539 Eleventh Ave. Helena, MT 59601
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Madison-Ruby-Jefferson River Watersheds Flood Maps Update


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. 

To understand what goes into a new floodplain study click here.


View Draft Data

New floodplain maps from this project are not expected to be finalized for a while – draft maps will be available to start reviewing in late 2020, but the study and maps will need to go through a lengthy technical and public review process before they can be finalized. When finalized, new maps could have effects on some property owners in the mapped 100-year floodplains. 

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

You can also view individual draft maps here:
View draft floodplain maps

Get more information on floodplain designations referenced on the maps, community meetings, and important information:

Gallatin County and the City of Three Forks (Updated Meeting information as of 11/16/2020)

Meeting information:
  • December 2, 2020 at 6pm - Public open house meeting.  To register for the virtual meeting please click here.

  • January 6, 2021 - Three Forks draft floodplain map public open house event.  Please check back for more information on how to register for this event.

  • City of Three Forks elected officials meeting held November 10, 2020. To view the slides presented click here.

Floodplain map appeal and comment information:
FEMA's formal appeal and comment period is tentative to begin mid to late 2021. For information on this process click here
Madison County and the Towns of Ennis, Twin Bridges, and Sheridan 
  • 100-Year Floodplain (1% Annual Chance Flood)
  • Floodway Area (within a 100-Year Floodplain)
  • 500 Year Floodplain
Jefferson County
  • 100-Year Floodplain (1% Annual Chance Flood)
  • Floodway Area (within a 100-Year Floodplain)
  • 500 Year Floodplain
Broadwater County 
  • 100-Year Floodplain (1% Annual Chance Flood)
  • Floodway Area (within a 100-Year Floodplain)
  • 500 Year Floodplain

 

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


Big Hole River Floodplain Maps

A flood study and floodplain maps for the Big Hole River were produced in 2015. The Big Hole River floodplain maps and study information will eventually be incorporated into preliminary FEMA floodplain maps at the same time as the rest of Madison County's draft floodplain maps.  Preliminary FEMA floodplain maps will go through a public review process before they are finalized.  


Attend a public open house meeting

Gallatin County & City of Three Forks

  • December 2, 2020 @ 6pm - Three Forks floodplain mapping and mitigation meeting.  To register for this virtual meeting: click here.
  • January 6, 2021 - Three Forks Draft floodplain map public open house event.  Please check back for more information on how to register for this event.

 

Madison County & Towns of Ennis, Twin Bridges, Sheridan

  • Please check back for more information

 

Jefferson & Broadwater County

  • Please check back for more information

 


Know your property's flood risk

Floodplain maps indicate areas of flood risk. Once this project is complete, updated flood risk information  will be reflected on new and updated FEMA Flood Insurance Rate Maps.  These maps will provide more accurate, current, and detailed information about flood risk areas.


Project Timeline

 

More Info

Maps and Technical Reports

 

Madison County

Alex Hogle
Floodplain Administrator/Planning Director
(406) 843-5250

Town of Ennis
Town of Twin Bridges

Jonathan Weaver
Floodplain Administrator
(406) 449-8627

Town of Sheridan

Bob Stump
Mayor/Floodplain Administrator
(406) 842-5431

Gallatin County

Sean O'Callaghan
Floodplain Administrator
(406) 582-3130

City of Three Forks

Kelly Smith
Floodplain Administrator
(406) 285-3431

Jefferson County

Megan Bullock
Floodplain Administrator
(406) 225-4126

Broadwater County

Shawn Higley
Floodplain Administrator
(406) 443-3962

DNRC Contacts

Nadene Wadsworth
DNRC Outreach Specialist
(406) 444-6732

Tiffany Lyden
DNRC Outreach Specialist
(406) 444-0599