County Line Bridge is a historic structure located in a rural area west of

Columbus Junction, Iowa Columbus Junction is a city in Louisa County, Iowa. The population was 1,830 at the 2020 census. It is part of the Muscatine Micropolitan Statistical Area. Columbus Junction is home of the historic Swinging Bridge, found one block south of Hi ...

, United States. The Louisa County Board of Supervisors approved the petition of Thomas Anwyl in April 1893 to build a bridge over Long Creek on the Louisa- Washington county line. They awarded a $1,174 contract to the Gillette-Herzog Manufacturing Company of Minneapolis to build two bridges. with The second span was the

Gipple's Quarry Bridge Gipple's Quarry Bridge is a historic structure located in a rural area southwest of Columbus Junction, Iowa Columbus Junction is a city in Louisa County, Iowa. The population was 1,830 at the 2020 census. It is part of the Muscatine Micropoli ...

over Buffington Creek in Elm Grove Township. The bridge span is supported by cast iron columns that were manufactured by the Cast Iron Pile and Bridge Company of Keosauqua, Iowa. The steel components were rolled by Carnegie, Gillette-Herzog in Pittsburgh. The pony truss bridge is typical of those built in the same era in Iowa, however, like Gipple's Quarry Bridge it has an unusual lower chord configuration with end panels that slope downward from the bearing shoes to the center panels. It has subsequently been abandoned. The bridge was listed on the National Register of Historic Places in 1998.

References

Bridges completed in 1893 National Register of Historic Places in Louisa County, Iowa National Register of Historic Places in Washington County, Iowa Road bridges on the National Register of Historic Places in Iowa Truss bridges in the United States Steel bridges in the United States Buildings and structures in Washington County, Iowa {{Iowa-struct-stub