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:

Sac City E
Sac City W
Saint John
Saint Lucas
Saint Olaf
Salem
Salina
Salix
Sanborn
Saratoga
Saude
Savanna
Schaller N
Schaller S
Schleswig
Scotch Grove
Scotch Ridge
Scranton
Searsboro
Selma
Seneca
Sergeant Bluff
Sexton
Seymour W
Seymour E
Shannon City
Sheffield
Shelby
Sheldon
Sheldon Creek
Sheldon SE
Shell Rock
Shellsburg
Shenandoah E
Shenandoah W
Sheridan, IA
Sheridan, MO
Sherrill
Sibley W
Sibley E
Sidney
Sigourney
Silver Lake
Silvis
Sioux Rapids SE
Sioux Center
Sioux City N
Sioux City S
Sioux Falls E
Sioux Rapids
Sioux Valley
Slater
Sloan
Smithland
Solon
South English
Spencer
Sperry
Spirit Lake
Spirit Lake SE
Spring Grove
Springbrook
Springville
St. Ansgar
St. Charles
St. Charles NW
St. Joseph
Stacyville
Stanhope
Stanley
Stanton
Stanton SW
Stanwood
State Center
State Center NW
Steamboat Rock
Stockport
Storm Lake
Storm Lake NE
Story City
Stout
Stratford
Strawberry Point
Stuart N
Stuart S
Sully
Sumner
Sumner SW
Superior
Sutherland E
Sutherland W
Sutter
Swaledale
Swea City
Swedesburg
Swisher