Brantingham Street Bridge (Floyd County, Iowa)
Built 1967
Steel stringer bridge over Cedar River on US 18
Open to traffic

Little Sioux River Bridge (Clay County, Iowa)
Built 1914; rehabilitated 1951
Concrete arch bridge over Little Sioux River on US 18/US 71
Open to traffic

Milwaukee River Bridge (Milwaukee County, Wisconsin)
Built 1924
Bascule bridge over Milwaukee River on State Street (Westbound US 18) in Milwaukee
Open to traffic

Milwaukee River Bridge (Milwaukee County, Wisconsin)
Built 1985
Vertical lift bridge over Milwaukee River on Wells Street (Eastbound US 18) in Milwaukee
Open to traffic

Mississippi River US 18 Bridge (Clayton County, Iowa)
Built 1974
Steel through arch bridge over Mississippi River on US 18 between Marquette and Prairie du Chien
Open to traffic

Rock Valley US 18 Bridge (Sioux County, Iowa)
Built 2002
Stringer bridge over Rock River on US 18
Open to traffic

Spencer Grand Avenue Bridge (Clay County, Iowa)
Built 1915; rehabilitated 1951
Lost concrete arch bridge over Little Sioux River on US 18/71 (Grand Avenue) in Spencer
Replaced by a new bridge