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DNRC Headquarters
1539 Eleventh Ave. Helena, MT 59601
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Missoula Granite Floodplain Maps Updates

Missoula and Granite Counties are working with MT DNRC and FEMA to update and produce new Flood Insurance Rate Maps (FIRMS) for the Clark Fork River, Bitterroot River, Rock Creek, and Rock Creek Tributaries. Updated 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 the 1970s.

For more information, see: Background on existing floodplain maps

View Draft Data

Draft maps and studies need to go through a lengthy technical and public review process. When finalized, new maps could have effects on some property owners in mapped 100-year floodplains. Click on your county below to learn about the floodplain designations referenced on the maps:

Missoula County
Granite County


Draft data reports



Structure Survey Report                  Hydrology Report                     Hydraulics Report Bitterroot River


Hydraulics Report Rock Creek                    Hydraulics Report Clark Fork River 

*Report appendix's available upon request

 Meeting Information

DNRC held project kickoff meetings on October 23, 2019 with Missoula County and the City of Missoula. To view the slides that were presented click here.

 Project information

Below are the study extents for the project. To view a larger image, click here.

Project Timeline 

Below is the tentative project timeline. 

More Info

Background on existing floodplain maps

Contact Missoula County

Matt Heimel
Missoula County Floodplain Administrator
(406) 258-4657

Contact the City of Missoula

Cassie Tripard
City of Missoula Floodplain Administrator
(406) 552-6673

Contact Granite County

Linda Bouck
Granite County Floodplain Administrator
(406) 859-7021

Contact Town of Drummond

Cary McLure
Town of Drummond Floodplain Administrator
(406) 288-3231

Contact DNRC

Nadene Wadsworth
MT DNRC Outreach Specialist
(406) 444-6732
MT DNRC Outreach Specialist
(406) 444-0599