Important Reminder:The Foursquare City Guide app officially sunset on December 15, 2024, with the web version following in early 2025. However, your check-in journey doesn’t end here! Join us on Swarm, where new adventures await.
The Union Arch Bridge, also called the "Cabin John Bridge," is a historic masonry designed as part of the Washington Aqueduct and as a roadway bridge. The bridge construction began in 1857 and was completed in 1864, with the roadway surface added later.