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Chesapeake & Ohio Canal National Historical ParkPhoto of boatman blowing lockhorn.
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Chesapeake & Ohio Canal National Historical Park
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Photo Great Falls of the Potomac River.  

Did You Know?
The Great Falls of the Potomac River is the second largest in the state of Maryland. It is a series of cascading falls. Water drops 76 feet in two-thirds of a mile. Natural hazards in the Potomac such as water falls and rapids created the need for canals for reliable water transportation.

Last Updated: February 20, 2008 at 11:04 EST