Marsh Rainbow Arch Bridge
Marsh Rainbow Arch Bridge, Concrete road bridge in Iowa, United States.
The Marsh Rainbow Arch Bridge incorporates two arched ribs on each side of the roadway, with the deck suspended from vertical risers above.
James Barney Marsh designed and constructed this reinforced concrete bridge in 1911, the same year he received a patent for the rainbow arch design.
The bridge represents early 20th-century engineering advancements in Iowa, demonstrating the transition from wooden structures to reinforced concrete construction methods.
Due to its narrow width limitations and increased traffic demands, the bridge no longer accommodates vehicles and remains preserved as a historical structure.
The structure holds the distinction of being the first documented Marsh rainbow arch bridge design in Iowa and among the earliest in the United States.
Location: Iowa
Architects: James Barney Marsh
GPS coordinates: 42.22944,-94.75444
Latest update: November 28, 2025 14:29
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