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.
Draft Data:
Click on the link below to see the proposed floodplain maps and how they compare to the existing FEMA maps. Keep in mind these maps are in draft format.
Public Meeting Information:
Public Open House Meetings for Granite County and the Town of Drummond:
- Oct 3, 2023 | Town of Drummond Community Library | view slides
Public Open House Meetings for Missoula County and the City of Missoula:
- Oct 18, 2022 | Commercial Building at the Missoula Fairgrounds | view slides | view video recording
- Oct 19, 2022 | Lolo School Lower Gym Lolo | view slides | view video recording
- Oct 20, 2022 | Missoula County Courthouse Sophie Moiese Room | view slides | view video recording
Project kickoff meetings
- October 23, 2019 with Missoula County and the City of Missoula. | view slides
Preliminary FEMA Maps Granite County
Preliminary FEMA maps are available for Granite County. To access the maps you can click here and visit FEMA's Map Service Center. https://msc.fema.gov/portal/home
Instructions on how to navigate the map service center can be found here.
Navigating FEMA's Map Service Center
Flood Study Reports
Structure Survey Report
Hydrology Report
Hydraulics Report Bitterroot River
*Report appendix's available upong request to local Floodplain Administrator
*Report appendix's available upong request to local Floodplain Administrator
Hydraulics Report Rock Creek
*Report appendix's available upong request to local Floodplain Administrator
Hydraulics Report Clark Fork River
*Report appendix's available upong request to local Floodplain Administrator
Give comments during the official Appeal and Comment Period:
During this project you will have the opportunity to submit an official comment or appeal about the proposed floodplain changes to FEMA. Check back here to stay informed on the specific dates of the Appeal and Comment Period.
Granite County mid 2024 (estimated)
Missoula County early 2025 (estimated)
Community fact sheets
100-year floodplain fact sheet (1% Annual Chance Flood)
Floodway fact sheet (area within the 100-year floodplain)
For more information contact your local Floodplain Administrator.
Missoula County
Matt Heimel
mheimel@missoulacounty.us
(406) 258-3799
City of Missoula
Cassie Tripard
TripardC@ci.missoula.mt.us
(406) 552-6673
100-year floodplain fact sheet (1% Annual Chance Flood)
Floodway fact sheet (area within the 100-year floodplain)
500-year floodplain fact sheet
For more information contact your local Floodplain Administrator.
Granite County
Linda Bouck
gcplanning@co.granite.mt.us
(406) 859-7021
Town of Drummond
Cary McLure
townofdrummond@blackfoot.net
(406) 288-3231
Project Timeline
Below is the tentative project timeline.
Map History & Project information
In Missoula County, floodplain maps were modernized through a Digitized Flood Insurance Rate Map (DFIRM) project initiated in 2005 and completed in 2015. Granite County was modernized to digital format with a 2016 RiskMAP project. The maps were converted from paper to digital. None of the proposed stream reaches were restudied during DFIRM conversion, and as a result, most of the effective mapping is almost 40 years old.
Below are the study extents and level of study for the Clark Fork and Bitterroot River and Rock Creek.
