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Map data CC-BY-SA by OpenStreetMap

National Flood Hazard Layer (NFHL)

The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map. The GIS data and services are designed to provide the user with the ability to determine the flood zone, base flood elevation, and floodway status for a particular location. It also has information about the NFIP communities, map panels, cross sections, hydraulic structures, Coastal Barrier Resource System, and base maps such as road, stream, and public land survey data. Through flood studies, FEMA produces Flood Insurance Study Reports, FIRM Panels, and FIRM Databases. FIRM Databases that become effective are incorporated into the NFHL. Updates to the NFHL are issued through Letters of Map Revision (LOMRs) and Letters of Map Amendment (LOMAs). Continuously updated, the NFHL serves as a Digital Flood Insurance Rate Map representing the current effective flood data for those communities where maps have been digitized. NFHL data can be viewed with widely available GIS software, including freely available programs that work with GIS shapefiles. For more information on the NFHL, see the online resources referenced herein. ___Using base maps:___ The minimum horizontal positional accuracy for base map hydrographic and transportation features used with the NFHL is the NSSDA radial accuracy of 38 feet. ___Letter of Map Amendment (LOMA) point locations___ are approximate. The location of the LOMA is referenced in the legal description of the letter itself. LOMA points can be viewed in the NFHL Interactive Map on the FEMA GeoPlatform.

Data and Resources

Metadata Source

Harvested from NFHL Harvest Source

About this Dataset

Resource TypeDataset
Metadata DateMay 16, 2016
Metadata CreatedApr 04, 2015
Metadata ModifiedSep 21, 2017
Reference Date(s)Jan 30, 2015 (publication)
Responsible PartyFederal Emergency Management Agency (pointOfContact)
Access Constraints["Use Constraints: The hardcopy FIRM and FIRM Database and the accompanying FIS are the official designation of SFHAs and Base Flood Elevations (BFEs) for the NFIP. For the purposes of the NFIP, changes to the flood risk information published by FEMA may only be performed by FEMA and through the mechanisms established in the NFIP regulations (44 CFR Parts 59-78). These digital data are produced in conjunction with the hardcopy FIRMs and generally match the hardcopy map exactly. Acknowledgement of FEMA would be appreciated in products derived from these data.", "Access Constraints: None"]
Bbox East Long147
Bbox North Lat72
Bbox South Lat-15
Bbox West Long-172
Coupled Resource
Frequency Of Updatemonthly
Harvest Object Id44b0849f-1207-46d0-b2f3-4ae67e20f958
Harvest Source Id6239ff33-3517-4ccd-bbdd-220beed8bc1e
Harvest Source TitleNFHL Harvest Source
Licence["No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty."]
Metadata Language
Metadata Typegeospatial
Spatial{"type": "Polygon", "coordinates": [[[-172.0, -15.0], [147.0, -15.0], [147.0, 72.0], [-172.0, 72.0], [-172.0, -15.0]]]}
Spatial Data Service Type
Spatial Reference System
Spatial Harvester
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