FEMA flood map notices
Flood map changes in Madison County, Montana
FEMA has published 2 flood hazard notices covering Madison County, Montana since November 2023. The most recent, map revision flood hazard determinations, was published Jul 9, 2026.
Notices for Madison County
- Jul 9, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 13 other counties
- Aug 22, 2024FinalFinal Flood Hazard DeterminationsAlso covers 5 other counties
Also covered by these notices
FEMA often studies whole watersheds, so one notice can span several counties.
- Maricopa County, AZ
- Pima County, AZ
- Riverside County, CA
- San Diego County, CA
- San Mateo County, CA
- Boulder County, CO
- Jefferson County, CO
- Larimer County, CO
- Pitkin County, CO
- Palm Beach County, FL
- Kootenai County, ID
- Hamilton County, OH
- Jackson County, OR
- Williamson County, TN
- King County, WA
- Kittitas County, WA
- Fond du Lac County, WI
- Carbon County, WY
What these notices mean
- Proposed
- FEMA has new draft flood maps. This starts a 90-day window when owners can appeal with technical data. It's the best time to act.
- Final
- Appeals are resolved. The new maps usually take effect about six months later, when lenders start applying the new zones.
- Map revision
- A Letter of Map Revision changes one stretch of the map, often after a levee, channel project or new survey.
Notices are organized by county and community, so a notice for your county doesn't mean your property is changing zones. What flood zones mean