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:

Cairo
Calmar
Camanche
Canby
Canton, IA
Canton, MN
Canton, SD
Canton, SD SW
Cantril
Carbon
Carpenter
Carroll E
Carroll NE
Carroll W
Carson
Carson NE
Cascade
Casey
Cassville
Castalia
Castana
Cedar Bluff
Cedar Falls
Cedar Rapids N
Cedar Rapids S
Center Point
Center Point NW
Center Point SW
Centerville E
Centerville W
Central City
Ceylon
Chariton
Charles City
Charter Oak
Chatsworth
Chelsea
Cheney
Cherokee N
Cherokee S
Cherry Grove
Chillicothe
Church
Churdan
Clare
Clarence
Clarinda N
Clarinda S
Clarion
Clarion SW
Clarksville
Clayton
Clear Lake E
Clear Lake W
Clearfield
Clearmont
Cleghorn
Cleopatra
Climbing Hill
Clinton
Clinton NW
Clio
Cloverdale
Clutier
Coal Valley
Coatsville
Coburg
Coggon
Coin
Colesburg
Colfax
Collins
Colo
Columbus Junction
Colusa
Colwell
Commerce
Confidence
Conger
Conrad E
Conrad W
Conroy
Conway
Coon Rapids NE
Coon Rapids N
Coon Rapids S
Cooper
Cordova
Corley
Cornelia
Corning N
Corning S
Correctionville
Correctionville NW
Correctionville SE
Corwith
Corydon
Corydon NE
Coster
Cotter
Coulter
Council Bluffs N
Council Bluffs S
Crawfordsville
Cresco NE
Cresco NW
Cresco SE
Cresco SW
Creston E
Creston W
Croton
Crystal Lake
Cumming
Cushing
Cylinder