Cabin John Aqueduct Bridge MD
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Description: The Cabin John Aqueduct Bridge, also known as the Union Arch Bridge, is a historic structure located in Cabin John, Maryland. Completed in 1864, it was originally designed to carry the Washington Aqueduct, which supplied water to Washington, D.C. The bridge is notable for its impressive single-span masonry arch, which was the longest in the world at the time of its completion, measuring 220 feet. Constructed primarily of granite, the bridge exemplifies 19th-century engineering prowess and remains a significant landmark. Today, it not only serves as a vital piece of infrastructure but also stands as a testament to the ingenuity and ambition of its era.