The Williamstown Bridge is a bridge over the Ohio River between Williamstown, West Virginia, and Marietta, Ohio.

It was the first inland cantilever highway bridge in the United States and also site of the first strike, in 1902, by the United Steel Workers union.

It reuses some of the piers from the prior bridge, although the Marietta approaches were relocated to a new connection with Ohio State Route 7.

This bridge is a continuous truss, the 28th-longest in North America.

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