Thomas Viaduct, Railway bridge in Elkridge, United States
The Thomas Viaduct spans 612 feet across the Patapsco River with eight granite arches constructed in a curved design between Relay and Elkridge.
The Baltimore and Ohio Railroad built this stone railroad bridge between 1833 and 1835, making it the first multi-span masonry railway bridge in the United States.
The obelisk at the eastern end of the viaduct carries inscriptions of the names of railroad directors, builders, and engineers who contributed to its creation.
The structure continues to support daily freight operations and MARC Camden Line commuter trains, demonstrating the durability of its engineering after nearly 190 years.
The bridge withstood the great flood of 1868 and Hurricane Agnes in 1972, while most surrounding structures in the Patapsco Valley suffered destruction.
Location: Baltimore County
Location: Howard County
Inception: 1835
Made from material: stone
GPS coordinates: 39.22170,-76.71330
Latest update: May 13, 2025 20:05
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