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

Richland County Flood Maps Update

Richland Map Photo

Richland County is 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 Yellowstone River.  New floodplain maps will depict the latest, most accurate flood risk data, and will eventually replace the existing floodplain maps which are based on data from 1978.

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 (expected late 2018). Property owners can educate themselves about the adoption of the new floodplain maps by taking the steps below.


View Preliminary floodplain maps and technical data

The Preliminary maps were released February 22, 2017. FEMA will open an official  later this year (expected October 2017) 90-Day Comment and Appeal Period Fact Sheet  click here for the Appeal & Comment form. 

Get more information on floodplain designations referenced on the maps:
Richland County: 100-Year Floodplain
Richland County: Floodway (within 100-Year Floodplain)
Richland County: 500-Year Floodplain 

Attend the public meeting

An evening public informational meeting is tentatively planned for Tuesday, September 26 in Sidney.  More details will be posted soon.

If you have any questions please or call Adam Smith Floodplain Administrator for Richland County (406-433-2407).

Come back for more information

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


More Info 

Maps & Technical Data

Contact Info

Adam Smith
Richland County
(406) 433-2407

Tiffany Lyden
Montana DNRC
(406) 444-0599