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:

Wacker
Wadena
Walcott
Wales
Walker
Wallin
Wallingford
Walnut
Walthill
Walthill SW
Wapello
Warsaw
Washington
Washta
Waterloo N
Waterloo S
Waterville
Waucoma
Waukee
Waukon
Waukon NW
Waverly
Wayland, IA
Wayland, MO
Webb
Webster City
Weldon
Weller
Wellman
Wellsburg
Wesley
West Bend
West Bend NE
West Branch
West Burlington
West Chester
West Grove
West Liberty
West Liberty SW
West Point
West Union
Westboro
What Cheer
Wheatland
Whittemore
Whitman
Wilbert
Williams
Williamsburg
Williamsburg NW
Williamstown
Wilmert Lake
Wilmington
Wilton
Winfield N
Winfield S
Winterset
Winthrop
Wiota
Woden
Woodbine
Woodburn
Woodland
Woodward
Woolstock
Worthington S
Wyoming E
Wyoming W