FEMA flood map notices
Flood map changes in Jefferson County, Montana
FEMA has published 1 flood hazard notice covering Jefferson County, Montana since November 2023. The most recent, proposed flood hazard determinations, was published Jul 9, 2025.
Notices for Jefferson County
- Jul 9, 2025ProposedProposed Flood Hazard DeterminationsAppeal period closed Oct 7, 2025
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