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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 February 2019). Property owners can learn about the adoption of the new floodplain maps by taking the steps below.

FEMA 90-Day Appeal and Comment Period - January 17-April 17, 2018

The 90-day comment and appeal period on the preliminary maps runs January 17 - April 17, 2018.  Any comments and/or appeals need to be submitted before April 17, 2018 to Adam Smith, Richland County Public Works Director.  For more information, see:

90-Day Appeal & Comment Period Information  
click here for the: Appeal & Comment

View Proposed Floodplain Maps

Preliminary FEMA Flood Insurance Rate Maps have been produced for this project.  Click on the box below to view the preliminary results  (viewer may load slowly)


You can also view the Preliminary Flood Insurance Rate Map panels and Preliminary Flood Insurance Study here:  View Preliminary floodplain maps and technical data

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

Public Meetings Held

Richland County and Montana DNRC hosted Public Open Houses in Sidney on January 31, 2017 and September 26, 2017 to review the draft maps and talk with property owners one-on-one about the proposed floodplain map changes.  

More information

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

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


More Info 

Maps & Technical Data

Contact Info

Adam Smith
Richland County
(406) 433-2407

Tiffany Lyden
Montana DNRC
(406) 444-0599