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An official website of the United States government

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Official websites use .gov

A .gov website belongs to an official government organization in the United States.

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Secure .gov websites use HTTPS

A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..

Lowest Floor Elevation (LFE)

The measured distance of a building's lowest floor above the National Geodetic Vertical Datum (NGVD) or other datum specified on the FIRM for that location.

Last updated March 5, 2020