Chesapeake and Ohio Aqueduct

Across the Monocacy River

Largest of eleven C&O aqueducts. Finished 1833, Alfred Cruger, Principal Engineer. Constructed of quartzite from Sugarloaf Mountain. It served until 1924, when after a flood, commercial operations ceased. Administered by the National Park Service.

Marker is at the intersection of Dickerson Road (Maryland Route 28) and Mouth of the Monocacy Road, on the left on Dickerson Road.