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Cabin John Bridge

Longest Masonry Arch Bridge in the Western Hemisphere

Bridge on Cabin John Creek in Piedmont in Bethesda, MD

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The Union Arch Bridge, also called the "Cabin John Bridge", is a historic masonry structure in Cabin John, Maryland. It was designed as part of the Washington Aqueduct. The bridge construction began in 1857 and was completed in 1864. The roadway surface was added later. The bridge was designed by Alfred Landon Rives, and built by the United States Army Corps of Engineers under the direction of Lieutenant Montgomery C. Meigs.The Union Arch Bridge was designated as a Historic National Civil Engineering Landmark by the American Society of Civil Engineers in 1972 and was listed in the National Register of Historic Places in 1973.

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Cabin John Creek

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