Thomas Viaduct, Baltimore & Ohio Railroad

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Over the Patapsco River between Relay and Elkridge, Relay, Maryland

Eight-span stone arch bridge over Patapsco River on the B&O Railroad between Relay and Elkridge

Photos 

Photo taken by Jim Allen in June 2011

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Map 

Description 

This viaduct spans the Baltimore & Howard county line.

The first multi-span masonry railroad bridge in the U.S. and the first to be built on a curving alignment, the Thomas Viaduct was the largest bridge in the nation in its day, and was named for Philip E. Thomas, first president of the B & O. -- Historic American Engineering Record (HAER MD-3)

National Register information 

Status
Posted to the National Register of Historic Places on October 15, 1966
Reference number
66000388
Architectural style
Other architectural type; Multiple stone arch
Areas of significance
Engineering; Transportation
Level of significance
National
Evaluation criteria
A - Event; C - Design/Construction
Property type
Structure
Historic function
Rail-related
Current function
Rail-related
Period of significance
1825-1849
Significant year
1835

Update Log 

  • January 27, 2014: New photos from Jim Allen

Sources