Alton, Iowa

3rd Avenue Bridge (Sioux County, Iowa)
Lost Pratt through truss bridge over Floyd River on 3rd Avenue
Replaced by a new bridge

CNW - Floyd River Bridge (Sioux County, Iowa)
Lost Quadrangular lattice through truss bridge over Floyd River on former Chicago & Northwestern Railway
Removed ca. 1980 following abandonment of CNW Marathon to Alton line.

UP - Bridge #228.45 (Sioux County, Iowa)
Stone arch bridge over Unnamed Creek on Union Pacific Railroad
Open to traffic

UP - Floyd River Bridge (Sioux County, Iowa)
Lost Deck plate girder bridge over Floyd River on Union Pacific Railroad
Destroyed by disaster