Constructed in 1850, and rebuilt in 1889, the Contoocook Railroad covered bridge is the oldest surviving covered railroad bridge in the United States, but it was turned into a warehouse in 1962

The bridge was washed off its abutments twice in its lifetime, first due to a flood in the Contoocook River in 1936 and then again by a hurricane in 1939. The bridge served as a railroad bridge until 1962. From 1962 until 1990, it was used by a local merchant as a warehouse

Currently, the bridge is used as a footpath for locals as well as the local wildlife.

https://www.atlasobscura.com/places/contoocook-railroad-covered-bridge