2 entries match your criteria. Related Historical Markers By Robert H. Moore, II, January 10, 2009 One of the locks at "Four Locks" SHOWN IN SOURCE-SPECIFIED ORDER1► Maryland (Washington County), Big Pool — Four Locks — Chesapeake and Ohio Canal National Historical Park — National Park Service, U.S. Department of the Interior — On Four Locks Road, on the left when traveling west. 2► Maryland (Washington County), Big Pool — Mule Power — Chesapeake and Ohio National Historical Park — National Park Service, U.S. Department of the Interior — On Four Locks Road, on the left when traveling west.
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