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Berks County > County Departments > Parks and Recreation
How a Lock Works
 
Boat Going Downstream
 
Downstream Diagram 1
Boat enters the lock; gate closes behind it.
 
Downstream Diagram 2
Water is released downstream; water level lowers in the lock.
 
Downstream Diagram 3
When the water level is low enough, the gate opens and the boat leaves the lock.
Boat Going Upstream
 
Upstream Diagram 1
Boat enters the lock; gate closes behind it.
 
Upstream Diagram 2
Water enters from upstream; water level rises in the lock.
 
Upstream Diagram 3
When the water level is high enough, the gate opens and the boat leaves the lock.