National Historic Park
Dam 4
Stop Gate Wench House
Hydroelectric plant on the West Virginia side
Similar to C&O Canal Dam #5, Stonewall Jackson tried to destroy Dam 4 during the Civil War. He was unsuccessful.
Other side of the dam
Calm Potomac
Thursday, July 13, 2023
Dam Four
July 13, 2023 -- Dam 4 and a stop gate are located at Mile 84.6 on the C&O Canal towpath. The Potomac River between Dam 4 and Lock 41 (Mile 88.9) is known as the Big Slackwater. Because it would have been near impossible to construct a canal through the limestone cliffs that hugged the Potomac River in this area, the canal engineers decided to build Dam 4 so that the river could be backed up to create a deep pool that was navigable year-round
National Historic Park
Dam 4
Stop Gate Wench House
Hydroelectric plant on the West Virginia side
Other side of the dam
National Historic Park
Dam 4
Stop Gate Wench House
Hydroelectric plant on the West Virginia side
Other side of the dam
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