Built in 1889 on the granite abutments of an older span, the Contoocook Railroad Bridge is the world's oldest surviving covered railroad bridge. It was probably designed by Boston & Maine Railroad engineer Jonathan Parker Snow (1848–1933) and built by carpenter David Hazelton (1832–1908). Under Snow, the Boston & Maine utilized wooden bridges on its branch lines until after 1900, longer than any other major railroad. The nearby depot was built in 1850 on the earlier Concord & Claremont Railroad, which the Boston & Maine acquired in 1887.