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Lockhouse, Guard Lock 5; house sets up on top of a hill with fence and brick wall

This lock provides access to the pool behind Dam 5 which was used by canal boats for a distance of about half a mile until the canal resumed beyond a rocky cliff that had blocked it. These locks behind dams were often called “inlet locks” as well as “guard locks.” The term “inlet lock” emphasizes that they let water into the canal from the river and the term “guard lock” emphasized that they were built into a guard, allowing the canal to pass through it. Such guard walls extend from the dam abutment to the adjacent hillside.