Casselman River Bridge

The Casselman River Bridge, east of Grantsville, Maryland, carried the National Road over the Casselman River, beginning in 1815. At the time it was built, it was the largest bridge of its type.


The bridge had fallen into considerable decay by the early 20th century.


It was restored in 1911 to carry automobile traffic and remained in operation until 1933, when a steel truss bridge on a newer alignment of US Route 40 replaced it.


The bridge was designated a National Historic Landmark in 1963. It is operated by the state of Maryland as a state park.


This illustration, from the Historic American Buildings Survey, shows the location of the bridge relative to the new alignment of Route 40.