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It is a gate-like system that enabled boats to be raised or lowered in a canal. Historic American canals, such as the Erie Canal, had them. Erie Canalway National Heritage Corridor :: Canal Locks and Structures
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Lock 12 Historic Area
Being a firm believer that "information wants to be free," when I came into possession of an out-of-print booklet published by Holtwood LLC detailing the Lock 12 Historic Area I transcribed the document's text and scanned the images. Both are included below with additional information and...unchartedlancaster.com
As others have said, a lock is a way to raise and lower boats on a canal. The boat enters, then gates close on both ends, and the water level raises, or lowers....then ONE gate is opened, and the boat is at the 'new' level of the canal (either higher, or lower, depending on the direction)
The old 'locks' and pathways next to the canals in many areas of the U.S. have become historic sites and recreation areas.
This area along the Susquehanna is just FULL of nooks and crannies and water pools and rocks and huge boulders and dropoffs....folks go to climb, swim, boat, etc. The river itself is known to be dangerous, deceiving. It's quite shallow in spots, but it is a very large river and drains a massive area of Pennsylvania and up in to New York.
oh thank you all
I saw those brick walls but I didn't know what I was looking at