A historically significant one-lane masonry bridge that carries MacArthur Boulevard and a pipeline of the Washington Aqueduct over Cabin John Creek and the Cabin John Parkway. Completed in 1864.
Name of bridge is "Union Arch Bridge." Also known locally as "Cabin John Bridge." Completed 1864. Designed by General Montgomery C. Meigs, US Army Corps of Engineers.
http://en.structurae.de/structures/data/index.cfm?ID=s0001282