(Rockville, 3830', 1902, 48 arches) across Susquehanna River SSE of Dauphin, Susquehanna Township, Dauphin County, PA. US22/322 S. 1.1 miles from jct with Erie St. in Dauphin, continue S. on Front St. 1.3 miles to the bridge. Worlds longest stone masonry arch bridge. Carries four tracks of the former Pennsylvania Railroad. (N40 20.002 W76 54.636) Photos by Jack Schmidt 6-10-06.