FEMA flood map notices
Flood map changes in Custer County, Idaho
FEMA has published 2 flood hazard notices covering Custer County, Idaho since November 2023. The most recent, map revision flood hazard determinations, was published Jun 11, 2026.
Notices for Custer County
- Jun 11, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 19 other counties
- Oct 2, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 19 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
- Pinal County, AZ
- Riverside County, CA
- San Diego County, CA
- Arapahoe County, CO
- Delta County, CO
- Douglas County, CO
- Routt County, CO
- Yuma County, CO
- Ada County, ID
- Bingham County, ID
- Canyon County, ID
- Lemhi County, ID
- Clark County, NV
- Douglas County, NV
- Deschutes County, OR
- Linn County, OR
- Meade County, SD
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