Thor Construction Co.

of Cedar Falls, Iowa
Davisons Creek Bridge (Marshall County, Iowa)
Built 1916
Slab bridge on Yates Ave
Open to traffic

Grand Avenue Bridge (Clay County, Iowa)
Built 1915
Lost concrete arch bridge over Little Sioux River on US 18/71 (Grand Avenue) in Spencer
Replaced by a new bridge

Old Rusty Bridge (Clay County, Iowa)
1915 Relocator, 1915
Through truss bridge over Little Sioux River on 210th Avenue north of Spencer in Spencer
Open to one-lane traffic