Digital Elevation Models (DEM) are digitized versions of USGS's 7.5 degree topographic maps. With the help of additional software, they may be used to automatically define the base elevations for objects included in air dispersion modeling analyses. These DEM files can be downloaded from this website below. All DEM files on this site are listed based on the letter they begin with and are named based on the USGS quadrangle they represent.

Choose the letter with which the name of the quadrangle begins:

Choose the DEM file you wish to download:

Fairbank
Fairfax
Fairfield N
Fairfield S
Fairview
Farmers City
Farmersburg
Farmington
Farnhamville
Farragut
Farson
Fayette
Fenton
Ferryville
Fertile
Fertile NE
Fertile SE
Festina
Fielding
Fillmore
Floris
Floyd
Fonda
Fonda NE
Fontanelle
Fontanelle SW
Forest City
Fort Atkinson
Fort Calhoun
Fort Dodge N
Fort Dodge S
Fort Madison
Frankville
Fraser
Fredericksburg
Frederika
Freeport
Fremont
Frost
Fulton