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 and some of its tributary streams. Many of the existing floodplain maps are based on data from the 1970's. 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 early 2019 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.
Public Meetings
Wheatland County, Harlowton, and Montana DNRC hosted two public open houses in Harlowton on 10/25/17. View the meeting materials: Presentation 100-Year Floodplain Floodway 500-Year Floodplain
Golden Valley County, Ryegate, Lavina, and Montana DNRC hosted two public open houses on 9/12/17. View the meeting materials: Presentation 100-Year Floodplain Floodway 500-Year Floodplain
Musselshell, Rosebud, and Petroleum Counties and the City of Roundup hosted several public open houses last fall and winter.
We will be scheduling additional public open houses -- stay tuned for updates. If you are unable to attend a meeting and/or need more information about this project, contact Tiffany Lyden with Montana DNRC.
Know your Property's Flood Risk
Click the floodplain map viewer box below to view proposed map changes:
Individual draft floodplain maps can be viewed here: Draft and Preliminary Maps.
When finalized, the new maps could have effects on some property owners in mapped floodplains. If you are currently or will be mapped into a 100-Year Floodplain, view these links about your flood risk areas: 100-Year Floodplain Floodway (within 100-Year Floodplain) 500-Year Floodplain
Roundup Area
FEMA map revisions for The Roundup Area have been through review and were issued on July 13, 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
Get technical information
Check out our page with Floodplain Work Maps (Draft/Preliminary 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.
