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DNRC Headquarters
1539 Eleventh Ave. Helena, MT 59601
Phone: (406) 444-2074 | Fax: (406) 444-2684
Questions? Email us

Musselshell River Flood Maps Update

Musselshell Flooding
Photo credit: Chris Boyer, 2011

The Musselshell River communities are currently working with the Federal Emergency Management Agency (FEMA) and the Montana Department of Natural Resources and Conservation (DNRC) to update floodplain maps for the Musselshell River.  New floodplain maps will depict the latest, most accurate flood risk data, allowing property owners and communities to better understand their flood risk and to protect themselves against flooding.

There will be insurance and development regulation implications for structures going into and coming out of the 100-Year Floodplain when the maps become effective (July 13, 2017 for the Roundup Area and expected Fall 2018 for the rest of the Musselshell communities). Property owners should educate themselves and prepare for the adoption of the new floodplain maps by taking the steps below.

Roundup Area Comment & Appeal Period March 15, 2017 - June 12, 2017

The Roundup Area project is tracking faster than other portions of the Musselshell.  FEMA map revisions have been issued for this area and are expected to go into effect on July 13, 2017.  The 90-Day Comment and Appeal Period for the Roundup Area map revisions is March 15, 2017 to June 12, 2017.  

Click City of Roundup Map Revisions to view the City map. To view the full Roundup Letter of Map Revision click here.

Click Musselshell County Map Revisions to view the County map. To view the full Musselshell County Letter of Map Revision click here.

Check out these fact sheets for more information about what it means to live in a flood zone:
Roundup: 100-Year Floodplain
Roundup: Floodway (Within 100-Year Floodplain) 
Roundup: 500-Year Floodplain

To submit Comments or Appeals on the Roundup Area maps or for more information check out the links below:
Roundup: Comment & Appeal Period Info Sheet
Roundup: Comment & Appeal Form 

Know your property's flood risk

Draft floodplain maps from this project are currently available for Golden Valley, Musselshell, Rosebud, and Petroleum counties at the link below. According to the draft floodplain maps, some structures will be moving into the 100-Year Floodplain and some will be moving out of the 100-Year Floodplain. 

Musselshell Viewer Button 2

Attend a public meeting

We will schedule public open houses for Golden Valley and Wheatland Counties in Spring 2017 to discuss this project with affected property owners there--stay tuned for updates. If you are unable to attend a meeting and/or need more information about this project, contact with Montana DNRC.

Get technical information

Do you have questions about the Musselshell River Flood Maps Update project? Check out our page with Floodplain Work Maps (Draft Maps) and technical data/reports.

Come back for more information

We will update this website with new, relevant information as the Musselshell River Flood Maps Update project moves forward.


More Info

Draft Maps & Technical Data
Musselshell Watershed Coalition 

Contact Info

Adam Carlson
Musselshell County
(406) 323-2777

Tiffany Lyden
Montana DNRC
(406) 444-0599