Flood map changes (LOMC)
FEMA Letters of Map Change in Montana since 1980, which remove properties from or add them to the mapped floodplain.
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About this data
- Published by
- FEMA
- Method
- FEMA’s NFHL archive and Hazus extracts, combined and deduplicated.
- Update frequency
- Quarterly
- Last updated
- Oct 6, 2026
- Records
- 4,378
- Coverage
- Statewide.
Records in 46 of 56 counties.
Known gaps
Points are at the case location FEMA gives, sometimes a community centroid.
Preview
The newest or first 500 records. Click a column heading to sort. Use the filter to find a place or a name.
Fields
| Field | Column | Description |
|---|---|---|
| Case no cid | case_no_cid | |
| Case number | case_number | FEMA case number. |
| Cid | cid | |
| Change type | lomc_type | LOMA, LOMR, LOMR-F or LOMR-FW. |
| Community | community | NFIP community. |
| County | county | |
| Effective date | effective_date | |
| Org | org | |
| Project | project | |
| Outcome | outcome | |
| Source link | fema_url | The record on the publisher’s site. |
| Src | src | |
| Longitude | lon | WGS84 degrees. |
| Latitude | lat | WGS84 degrees. |
Downloads and links
Data 4 MT is an index of public records. It republishes only what Montana and federal agencies make public, with a link to the source on each record. People are shown as “Private individual” on public pages and downloads; companies, trusts held by institutions, and governments keep their names. No document images, sale prices, voter, MVD or wildlife-telemetry data are stored. Verify any record against the publisher’s copy before relying on it.