Rockwell City Bridge

Rockwell City Bridge
U.S. National Register of Historic Places
Location	270th St. over an unnamed stream
Nearest city	Rockwell City, Iowa
Coordinates
Area	less than one acre
Built	1915
Built by	Iowa Bridge Company
Architect	James B. Marsh
Architectural style	Marsh arch
MPS	Highway Bridges of Iowa MPS
NRHP Reference #	98000752
Added to NRHP	June 25, 1998

The Rockwell City Bridge is located just east of Rockwell City, Iowa, United States. The 60-foot (18 m) span carried traffic on 270th Street over an unnamed stream. In 1915 Calhoun County requested the Iowa State Highway Commission (ISHC) and Des Moines engineer James B. Marsh to design a bridge for this crossing. The ISHC designed a double span concrete girder structure, while Marsh submitted his patented single-span rainbow arch configuration. They chose the Marsh submission, and contracted with the Iowa Bridge Company to build six bridges for $11,690, which included the costs for this bridge at $4,107.65. Originally built to serve a county road, it was later incorporated into the route for U.S. Highway 20 and carried heavy traffic until the highway was realigned in 1981. While no longer in use, the bridge remains in place just south of the replacement span. It was listed on the National Register of Historic Places in 1998.