| The 48 arch, 3791' long sandstone with concrete interior Rockville bridge was built 1900/02 by the Pennsylvania Railroad to replace a 2 track iron truss bridge built in 1877. The first bridge built at this location was a wood structure built 1847/49. The stone arches each have a 70' span and are 52' wide to support 4 tracks. Most piers are 8' wide but every eighth pier is 19' and are called abutment piers to aid in construction of the bridge in sections. It stands roughly 50' above the surface of the Susquehanna River. It remains the world's longest stone arch bridge and was added to the National Register of Historic Places in August of 1975. (HAER PA-524) |