Base Flood Elevations

As the Official Map Repository of the Jefferson County, Kentucky Flood Insurance Rate Maps (FIRM), MSD can assist surveyors in acquiring Base Flood Elevations for properties within Jefferson County.

The Base Flood Elevation, or BFE, is the height of the base (1-percent-annual-chance) flood, in feet, in relation to the North American Vertical Datum of 1988. The FEMA BFE was adopted by the National Flood Insurance Program as the basis for floodplain management and flood insurance regulations. MSD also regulates to the local regulatory base flood elevation and the combined sewer floodprone base flood elevation if a project is impacted by the local regulatory floodplain or the combined sewer floodprone area.

Request BFE Letter


Survey Control

The Jefferson County, Kentucky geodetic control network consists of a county-wide, locally maintained grid of first-order geodetic survey control monuments. The network was established in 2001 by the Louisville/Jefferson County Information Consortium (LOJIC).

LOJIC has installed and annually maintains the first order horizontal/vertical geodetic control monuments in a county-wide network of control monuments. All are permanent disks, most set in 40" concrete columns, and all have a stability rating of A or B as defined by the National Geodetic Survey (NGS). The monuments are recovered at least every five years.

The approximate two-mile grid of control across Jefferson County (less in the urban core of Louisville) are tied to the NGS High Accuracy Reference Network (HARN).

To access the survey control monuments in Jefferson County, click here: