The Chain Bridge is a viaduct that crosses the Potomac River at Little Falls in Washington, D.C., and Arlington County, Virginia.

Left turns onto the Clara Barton Parkway from the Chain Bridge are prohibited, but the reverse is permitted.

It was replaced by a crossbeam truss structure that resembled a long garden arbor or pergola, but retained its historical name.

During the American Civil War, the Chain Bridge was a popular place for the Union Army to access the countryside encampments from Fairfax County.

In a nine-hour ordeal, the balloon Union was fully inflated in Washington and walked out to the battlefield at Lewinsville, Virginia.

[3] The eighth and present version of the bridge is a continuous steel girder structure, completed in 1938 on piers dating from the 1870s.