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

New Maps and Study Currently Being Finalized

The Appeal and Comment period on the preliminary maps and study ended April 17, 2018. All comments and appeals were submitted to FEMA for review.  Thank you to everyone who submitted comments and information on the preliminary maps and study.  FEMA is currently finalizing the maps and study based on submitted information, and is expected to issue finalized maps in early 2019. 

The finalized maps and study are expected to go into effect in mid-August 2019. 

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