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Current use/information: No longer used, in state park: http://www.dnr.state.md.us/publiclands/casselmanhistory.html.
Statement of Significance (as of designation - January 29, 1964):
The bridge was part of the earliest Federal highway project, the National Road. At completion, it had the largest stone arch in the United States.
Comments and questions about the database may be directed to NHL_info@nps.gov