Historical Structures
Many of the National Road's original stone arch bridges also remain on former alignments. Notable among these is the Casselman River Bridge near Grantsville, Maryland; built in 1813-1814, it was the longest single-span stone arch bridge in the world at the time.
The Wheeling Suspension Bridge across the Ohio River, opened in 1849, is the oldest vehicular suspension bridge in the United States still in use. A newer bridge carries I-70 and the realigned U.S. 40 across the river nearby. The original bridge is listed as both a National Historic Landmark and Historic Civil Engineering Landmark.
One of the road's original toll houses is preserved in La Vale, Maryland, and two others are located in Addison, Pennsylvania, and near Uniontown, Pennsylvania.
Many mile markers can still be found along the National Road, some well-maintained, others deteriorating, and yet others represented by modern replacements.
Various sections of brick pavement, built in the early twentieth century, are still in use on little-traveled alignments, particularly in eastern Ohio.
Read more about this topic: National Road, History
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