Iowa State Highway Commission

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Adair Viaduct (Adair County, Iowa)
Alden Bridge (Hardin County, Iowa)
Big Slough Creek Bridge (Muscatine County, Iowa)
Boone Bridge (Boone County, Iowa)
Bridge near West Liberty (Muscatine County, Iowa)
Rigid frame bridge over an unnamed creek on 120th Street
Burlington Railroad Overpass (Lucas County, Iowa)
Cherry Street Bridge (Butler County, Iowa)
Open spandrel, concrete arch bridge over a drainage ditch on Cherry Street in Shell Rock
Coon Rapids Bridge (Carroll County, Iowa)
Des Moines River Bridge (Humboldt County, Iowa)
Goldfield Bridge (Wright County, Iowa)
Herrold Bridge (Polk County, Iowa)
Iowa Falls Bridge (Hardin County, Iowa)
Jefferson Street Viaduct (Wapello County, Iowa)
Keigley Branch Bridge (Story County, Iowa)
Kittyhawk Avenue Bridge (Carroll County, Iowa)
Pony truss bridge over an unnamed creek on Kittyhawk Avenue
Matsell Bridge (Linn County, Iowa)
Reportedly haunted, the bridge is a through Plate girder bridge built by the ISHC in 1939, the longest such span in Iowa
Nishnabotna River Bridge (Mills County, Iowa)
Olympic Avenue Bridge (Carroll County, Iowa)
Pony truss bridge over a tributary of Storm Creek on Olympic Avenue
Otter Creek Bridge (Fayette County, Iowa)
Concrete girder bridge over Otter Creek on 40th Street
Quail Avenue Bridge (Carroll County, Iowa)
Robin Avenue Bridge (Carroll County, Iowa)
Pony truss bridge over Storm Creek on Robin Avenue
Rock Falls Bridge (Cerro Gordo County, Iowa)
Open-spandrel arch bridge over Shell Rock River on Spring Street in Rock Falls
Shell Rock Bridge (Butler County, Iowa)
Three-span, closed spandrel, concrete arch bridge over Shell Rock River on Cherry Street in Shell Rock
Shellsburg Bridge (Benton County, Iowa)
Stewart Avenue Bridge (Cerro Gordo County, Iowa)
Arch bridge over Winnebago River on North Carolina Avenue in Mason City
Stoe Creek Bridge (Fayette County, Iowa)
Concrete girder bridge over Stoe Creek on V Avenue
Storm Creek Bridge (Carroll County, Iowa)
Pony truss bridge over Storm Creek on Phoenix Avenue
Storm Creek Bridge 2 (Carroll County, Iowa)
Sumner Bridge (Fayette County, Iowa)
Tee beam bridge over Little Wapsipinicon River on 160th Street in Sumner
Wapsipinicon River Bridge (Buchanan County, Iowa)
Four-span concrete arch bridge over the Wapsipinicon River on IA 150 in Independence
Washington Avenue Bridge (Hardin County, Iowa)
Winnebago River Bridge (Cerro Gordo County, Iowa)
Concrete tee beam bridge over Winnebago River on southbound US 65