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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 draft floodplain maps and technical data

These maps are in draft format and need to go through public review before being finalized. FEMA will open an official 90-Day Comment and Appeal Period later this year (expected fall 2017). 

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

Public Open House
Tuesday, January 31, 6:00pm-8:00pm
Fairgrounds Event Center
2118 W Holly Street, Sidney

During this open house, staff from the Montana DNRC and Richland County will be on hand to review the draft floodplain maps one-on-one with property owners and answer specific questions. There will be a short, informational presentation at 6:15pm and 7:15pm regarding the project and project updates.

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 

Draft Maps & Technical Data

Contact Info

Adam Smith
Richland County
(406) 433-2407

Tiffany Lyden
Montana DNRC
(406) 444-0599