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The Francis Scott Key Bridge, more commonly known as the Key Bridge, is a six-lane reinforced concrete arch bridge conveying U.S. Route 29 traffic across the Potomac River between the Rosslyn neighborhood of Arlington County, Virginia and the Georgetown neighborhood of Washington, D.C. Completed in 1923, it is Washington's oldest surviving bridge across the Potomac River.
The Classical Revival bridge was designed by architect Nathan C. Wyeth and engineer Max C. Tyler. It was built by the United States Army Corps of Engineers between 1917 and 1923, and was named after Francis Scott Key, author of The Star Spangled Banner. The northern terminus of the bridge is just east of the site of Key's Georgetown home, which was dismantled in the late 1940s; near that site, there is now a community park honoring Key.
*For more information & history go to Wikipedia.