Thor Construction Co.
of Cedar Falls, Iowa
Grand Avenue Bridge
(Clay County, Iowa)Built 1915Lost concrete arch bridge over Little Sioux River on US 18/71 (Grand Avenue) in SpencerReplaced by a new bridge
Old Rusty Bridge
(Clay County, Iowa)1915 Relocator, 1915Through truss bridge over Little Sioux River on 210th Avenue north of Spencer in SpencerOpen to one-lane traffic