This says it goes from Maryland to DC.....................which is the direction of the flow.......

Chesapeake and Ohio Canal National Historical Park
IUCN category V (protected landscape/seascape)
Location	extending from Cumberland, MD to Georgetown, Washington, DC, USA
Nearest city	Washington, D.C.
Coordinates	38°53′59″N 77°03′28″WCoordinates: 38°53′59″N 77°03′28″W
Area	19,586 acres (7,926 ha)
Established	September 23, 1938
Visitors	3,937,504 (in 2011)[1]
Governing body	National Park Service