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:

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.