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Dam 4;a large stone building at the end of embankment

This dam, like all six of the dams built by the C&O Canal Company, was originally built of wooden cribs filled with stones and covered with heavy planks. Because such bridges were very vulnerable to damage by floods and winter ice, in the 1850s the company replaced the original crib dam with a solid masonry dam that was considered one of the strongest in the county when completed. The inlet or guard lock associated with this dam is a mile upstream.