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What is that?
Guide to Common Canal Structures
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Lock 0 Power House 0 Gate Cabinet
Lock   Power House   Gate Cabinet
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Lift Bridge 0 Dam 0 Guard Gate
Lift Bridge   Moveable Dam   Guard Gate
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Historic Lock 0 Aqueduct 0 Restored Aqueduct, Camillus
Historic Lock   Aqueduct   Restored Aqueduct
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Dry Dock, Chittenango 0 Bowstring Bridge 0 Lock Operator
Dry Dock   Bowstring Truss Bridge   Lock Operator
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MOVABLE Dam 0
Dam at Lock 11, Amsterdam 0
 
Dam at Erie Lock 11, Amsterdam

 
Eight movable dams between Schenectady and Fort Plain are designed to regulate water flow from the Mohawk River. While they look like bridges, only two carry roadways. The gates of the dam are lowered into the river to form navigable pools during the summer but are pulled out of the water in winter to clear the way for ice and debris-filled floodwaters.
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