^ "Listing of National Historic Landmarks by State".Maryland Department of Natural Resources. ^ "DNR restricts access to the bridge and the immediate area" (Press release).^ a b "Casselman River Bridge State Park".^ "Casselman River Bridge Bicentennial".United States Geological Survey, United States Department of the Interior. Historic structures to the east of the park include Stanton's Mill, which is listed on National Register of Historic Places, and the restored log cabin craft shops of Spruce Forest Artisan Village. In addition to walking over the historic bridge, the state park offers picnicking facilities and fishing in Casselman River. The bridge was closed to vehicles in 1953 and partially restored by the state in the mid-1950s. In the 1940s and early 1950s, efforts were made to preserve the bridge when sections started to crumble and fall apart. The bridge was strengthened for motorized traffic in 1911 and continued in service as a highway until 1933, when a modern steel span was built nearby to serve what is now US Route 40 Alternate. A small portion of the original National Road still exists at the approaches to the bridge. As a "tidal wave" of western expansion followed the opening of the National Road, Casselman Bridge had heavy traffic that included 10-ton loads drawn by 12-horse teams. The first wheeled vehicles crossed the bridge in 1815. The bridge was constructed in 1813–1814 to aid in the westward movement through the frontier wilderness west of Cumberland, Maryland. The 354-foot-long (108 m) stone arch bridge spans 80 feet (24 m) with a 30-foot-high (9.1 m) arch and a roadway width of 48 feet (15 m). The bridge was declared a National Historic Landmark in 1964, and placed on the National Historic Register in 1966.
Since 1957, the structure, which has also been known as Casselmans Bridge, Castleman's Bridge, and Little Crossings Bridge, has been preserved by the state of Maryland as Casselman River Bridge State Park. Historic markers posted at each end read: The bridge was built in 1813-1814 as part of the National Road. The Casselman Bridge is an historic transportation structure on the Casselman River, located immediately east of Grantsville in Garrett County, Maryland. Route 40 Alternate, Grantsville, Maryland
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