FEMA flood map notices
Flood map changes in Linn County, Iowa
FEMA has published 3 flood hazard notices covering Linn County, Iowa since November 2023. The most recent, map revision flood hazard determinations, was published Aug 6, 2026.
Notices for Linn County
- Aug 6, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 29 other counties
- Jun 11, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 30 other counties
- Jan 11, 2024FinalFinal Flood Hazard DeterminationsAlso covers 4 other counties
Also covered by these notices
FEMA often studies whole watersheds, so one notice can span several counties.
- Madison County, AL
- Benton County, AR
- Shasta County, CA
- Lower Connecticut River Valley Planning Region, CT
- Northeastern Connecticut Planning Region, CT
- Southeastern Connecticut Planning Region, CT
- Kent County, DE
- Charlotte County, FL
- Indian River County, FL
- Marion County, FL
- Pasco County, FL
- Story County, IA
- Hamilton County, IN
- Norfolk County, MA
- Baltimore County, MD
- Washtenaw County, MI
- Wayne County, MI
- Lorain County, OH
- Tulsa County, OK
- Dorchester County, SC
- Kingsbury County, SD
- Sevier County, TN
- Shelby County, TN
- Bexar County, TX
- Brazoria County, TX
- Collin County, TX
- Denton County, TX
- Harris County, TX
- Tarrant County, TX
- Webb County, TX
- Wise County, TX
- Cumberland County, VA
- Skamania County, WA
- Marathon County, WI
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