Pennsylvania Historic Preservation: PennDOT’s New Historic Bridges of Pennsylvania GIS Map
Pennsylvania Historic Preservation: PennDOT’s New Historic Bridges of Pennsylvania GIS Map. “From stone arches and covered bridges to metal trusses and cable suspension bridges, Pennsylvania has a diverse collection of bridge types across its landscape. This includes over 400 historic bridges, bridges that are eligible for listing, or are listed, in the National Register of Historic Places. To showcase this collection, PennDOT created the Historic Bridges of Pennsylvania web map, an interactive GIS layer with locational and basic historical information about each bridge.”