County Line Bridge is a historic structure located in a rural area west of Columbus Junction, Iowa, United States.

[2] The second span was the Gipple's Quarry Bridge over Buffington Creek in Elm Grove Township.

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.

This article about a property in Louisa County, Iowa on the National Register of Historic Places is a stub.

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