 Among them are the Casselman River bridge in Grantsville, and the bridge over Braddock Run, a tributary of Wills Creek, in Clarysville.The original National Road bridge over the Casselman River was a stone arch bridge constructed in 1813.The span was built to be the largest bridge of its type in the United States at the time, and during its construction it was believed that the bridge could not stand on its own.