Change the flood mapthe right way.
Conditional and final Letters of Map Revision, prepared, submitted and carried through FEMA review.
Two letters.One map change.
A CLOMR comes before you build. A LOMR comes after.
A CLOMR (Conditional Letter of Map Revision) is FEMA’s comment on a proposed project: if it’s built as designed, would it meet the requirements to revise the flood map? It gives developers and communities certainty before money goes into the ground.
A LOMR (Letter of Map Revision) officially changes the flood map after the project is built, based on as-built information.
Not every map question needs a revision. If a structure or lot sits on natural ground above the base flood elevation, a Letter of Map Amendment (LOMA) may be enough. If it was raised by fill, the request is a LOMR-F.
From proposalto a new map.
Click through the six stages. Timing depends on the project, the community and FEMA’s review.
Scope and data
Get FEMA’s effective model, survey the site and confirm what the community requires.
The package,built for the reviewer.
Duplicate effective model
FEMA’s effective model reproduced first, so every change is measured against the official baseline.
Corrected effective & existing
Errors fixed and detail added, then the site as it is today.
Proposed or as-built
The project itself, designed (CLOMR) or constructed (LOMR).
FEMA MT-2 application forms
The standard forms for map revision requests, completed and signed.
Annotated work maps
Floodplain and floodway boundaries, existing and revised, tied to the model.
Report & certifications
A narrative that explains every change and the data behind it.
Projects thatchange the map.
- Fill or structures that would move the floodplain boundary or change the BFE
- Channel modifications and stream restoration
- Bridge and culvert replacements that change water surface elevations
- Floodway encroachments that would raise the BFE, which need a CLOMR before they can be permitted (44 CFR 60.3(d)(4))
- Developers who want FEMA’s answer before construction
Straightanswers.
Is a CLOMR required?
Only for certain projects, such as floodway encroachments that would raise the base flood elevation. Many developers get one anyway, because it answers the mapping question before construction.
Does FEMA charge a fee?
FEMA charges review fees for most CLOMR and LOMR requests, set on its published fee schedule. We’ll tell you which applies to your project.
How long does it take?
It depends on the project and on FEMA’s review, which often includes requests for more data. We’ll give you a realistic schedule once we’ve seen the site.
Does the community have to sign off?
Yes. Map revision requests go through the community’s floodplain administrator, who acknowledges the request before FEMA reviews it.