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:

Bagley, IA
Bagley, IA NW
Bagley, WI
Baldwin
Balltown
Bancroft
Barnes City
Bassett
Battle Creek
Baxter
Baxter SE
Bayard
Bedford
Bedford SW
Beebeetown
Beech
Beetown
Belle Plaine SW
Belle Plaine
Bellevue
Belmond
Bennett
Benton
Berkley
Bernard
Bertha
Bertram
Bigelow
Bingham
Blackhawk
Blair
Blairsburg
Blairstown
Blakesburg NE
Blakesburg
Blanchard
Blanchard Island
Blencoe
Blockton
Blockton SE
Bloomfield N
Bloomfield S
Bluffton
Bode
Bonaparte
Boone East
Boone West
Boxholm
Boyden
Boyer
Bradgate
Brandon, IA
Brandon, SD
Breda
Bremer
Bricelyn
Bridgeport
Bridgewater
Brighton
Bristol
Britt
Brock
Brodtville
Brooklyn
Brookville
Brooks
Brunsville
Buckeye E
Buckeye W
Buckingham
Buffalo Center
Buffalo Center NE
Buffalo Center SW
Bunker Hill
Burchinal
Burlington
Burr Oak
Burt
Butler Center
Buxton