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:

Tabor
Tabor NE
Tabor SW
Tama
Taylor
Tekamah
Tekamah NW
Templeton
Terril
Thompson
Thomson
Thor
Thornton
Thorpe
Tiffin
Tingley
Tingley NE
Tipton E
Tipton W
Titonka
Toolsboro
Traer
Trenton
Treynor
Tripoli
Tripoli NW
Troy Mills
Truro
Turkey River