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The Monocacy Aquaduct part of the National Park Service. The C&O Canal runs alongside the Potomac River in Maryland.

Lockhouse 44 in Williamsport is just one of the many Canal Discoveries you can find on our website. Each discovery includes a first-person description of a location in the park from one of the C&O Canal's rangers, an easy-to-navigate map with links to other nearby attractions, and a photo gallery. Photo of Lockhouse 44 by Mark Anders