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long, is the best known one, as it is featured in the 1995 movie The Bridges of Madison County.

The remaining covered bridges were designed by Harvey P. Jones and George K. Foster, with the following exceptions: Eli Cox built the Cutler-Donahoe Bridge, and J. P. Clark built the Imes Bridge.

Tunnel

Madison County is home to the only highway tunnel in Iowa, Harmon Tunnel, through the neck of an incised meander

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