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Chesapeake & Ohio Canal National Historical ParkPhoto of Conococheague Creek Aqueduct at Williamsport
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Chesapeake & Ohio Canal National Historical Park
The Four Locks Community
Photo of historic four locks

NPS Photo

Four locks is full of history and culture.

The Four Locks community developed in a region where the Potomac River makes a hairpin turn, traveling a loop of about four and half miles before returning to within a half mile of itself. The Canal Company decided to shorten its route by cutting across the neck rather than following there river bank. This decision created problems, though, because it meant they had to build four locks (numbers 47 through 50) close together to compensate for the rise of the river over those four-and-a half miles. The community that developed there consisted of several buildings, including a lockhouse (a home for the lockkeeper and his family), a store, several houses, a barn, a wait house (for those on the boats), a warehouse, and a school.

Questions for Photo 1

1. Why might a store at Four Locks attract a lot of business? In other words, why might a family be more likely to shop there than at a store near just one lock?

2. Why would a school be located in such a remote area?

Photo Monocacy Aqueduct along C&O Canal.  

Did You Know?
Aqueducts are water filled bridges. Aqueducts carried the canal and boat traffic over major waterways, like rivers. Of the 11 aqueducts built along the canal, the Monocacy Aqueduct is the longest at 516 feet, its seven arches constructed mainly of stone quarried from nearby Sugarloaf Mountain.

Last Updated: July 28, 2006 at 19:01 EST