Come Visit a Piece of American History

The Maryland Department of Natural Resources invites you to see a stunning piece of American history, the Thomas Viaduct. Part of the Patapsco Valley State Park, the viaduct represents an important piece of America’s Civil War History.

Completed in 1835, the Thomas Viaduct is the world’s largest multiple arched stone railroad bridge with an arc. The viaduct was named for Philip E. Thomas, the first president of the B&O Railroad. It played a vital role in bringing Union troops and material to the front against the Confederacy during the Civil War. 

This enduring feat of engineering and American ingenuity still stands and welcomes visitors. Bring the family down to the Patapsco Valley State Park for a day out in nature. The park is located at 8020 Baltimore National Pike, Ellicott City, Maryland, 21043. It is open from 9:00 am until sunset daily. Admission is $2 per vehicle for Maryland residents and $4 per vehicle for out of state visitors.

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