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1539 Eleventh Ave. Helena, MT 59601
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Musselshell River Flood Maps Update


Musselshell Flooding
Photo credit: Chris Boyer, 2011

The Musselshell River communities have been working with the Montana Department of Natural Resources and Conservation (DNRC) and the Federal Emergency Management Agency (FEMA) 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.

New floodplain maps for Musselshell, Rosebud, and Petroleum Counties became effective 11/15/19.  Maps for Golden Valley go into effect 11/5/21.  Maps for Wheatland County are still going through public review. 

There can be insurance and development regulation implications for structures going into and coming out of the 100-Year Floodplain when new floodplain maps become effective.  Property owners can educate themselves and prepare for the adoption of the new floodplain maps by taking the steps below.

Are you Newly Mapped in a 100-Year Floodplain?  Click here for Cost-Saving Insurance Options

Wheatland and Golden Valley Counties

Click the floodplain map viewer box below to view proposed map changes:

Preliminary Floodplain Map Viewer
Wheatland and Golden Valley Counties


Individual preliminary floodplain maps and studies can be viewed here:
Preliminary Maps and Studies

Harlowton and Wheatland County - Appeal and Comment Period to start in late 2021

The City of Harlowton hosted an informational public meeting:
5:30-7pm Thursday, June 3
Harlowton Public Library - Conference Room, 13 Central Ave. S, Harlowton
Meeting materials:  100-Year Floodplain    Floodway (within 100-Year Floodplain)    500-Year Floodplain

A 90 Day Appeal and Comment Period is expected to be held for Wheatland County's preliminary maps and study, starting in late 2021.  

Golden Valley - New Maps and Study Effective November 5, 2021

No comments or appeals were received during the 90-Day Appeal and Comment Period for Golden Valley's preliminary maps and study (September 3 - December 2, 2020).  The maps and study will go into effect on November 5, 2021.  

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 


Mapping Status by County:

Petroleum County
New maps for the Petroleum County side of the Musselshell River went into effect on 11/15/19.  Maps can be viewed using FEMA's Map Service Center: https://msc.fema.gov  For more information contact Petroleum County or with Montana DNRC.
Musselshell County
New maps for Musselshell County went into effect on 11/15/19.  Maps can be viewed using FEMA's Map Service Center: https://msc.fema.gov  For more information contact
Rosebud County
New maps for the Musselshell River in Rosebud County went into effect on 11/15/19.  Maps can be viewed using FEMA's Map Service Center: https://msc.fema.gov  For more information contact the Rosebud County Commissioners or with Montana DNRC.
Wheatland County
Wheatland County has preliminary maps that have not yet gone through an Appeal and Comment period.   Harlowton hosted an informational meeting Thursday, June 3, 5:30-7pm, Harlowton Public Library. 

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
Golden Valley has preliminary maps.  An official comment and appeal period was held in late 2020.  New maps will go into effect on 11/5/21.  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 

Know your Property's Flood Risk

When finalized, 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  


Appeal and Comment Periods

Before being finalized, floodplain maps and studies go through a lengthy technical and public review process, including a 90-Day Appeal and Comment Period.  Musselshell, Rosebud and Petroleum Counties completed their 90-Day Appeal and Comment period in January 2019.  The Appeal and Comment Period for Golden Valley County was held September 2 - December 3, 2020.  The Appeal and Comment Period for Wheatland County is anticipated to begin late 2021. Input on the preliminary maps and reports are encouraged and welcome.


Come back for more information

We will update this website with new, relevant information as the Musselshell River Flood Maps Update project moves forward. For more information about this project, contact with Montana DNRC.

 

 

 

More Info

Preliminary Maps & Technical Data
Musselshell Watershed Coalition 
Floodsmart

 

Contact Info

Andrew Harper
Musselshell County
(406) 323-2777

Janel Tucek / Jay King
Petroleum County
(406) 429-5311

County Commissioners
Rosebud County
(406) 346-2251

Page Dringman
Golden Valley, Wheatland County, Ryegate
(406) 932-5470

Paul Otten
Harlowton
(406) 632-5523

Tiffany Lyden
Montana DNRC
(406) 444-0599