Chesapeake & Ohio Canal, Lockhouse 18 (Ruins), Lock 18, MacArthur Boulevard Vicinity, Potomac, Montgomery County, MD

Significance: Seventy-four lift locks raised the level of the canal from tidewater at Georgetown in the District of Columbia to 605 feet at Cumberland. Located adjacent to Lock #18 on the berm side of the canal is the remains of a lockhouse which served both Locks 17 and 18. It was constructed soon after 1830 of red sandstone from the quarries of Seneca Creek.
Unprocessed Field note material exists for this structure: FN-15
Survey number: HAER MD-33
Building/structure dates: 1850 Initial Construction
Building/structure dates: 1924