22 Million Gallons of Water to Lift a Boat
Despite changes in machinery and power sources, today's locks work much as they did 200 years ago. By opening and closing valves, water moves in and out of the lock chamber using only gravity. Over 22 million gallons of water move through the Poe Lock every time a boat is raised or lowered.

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Photo by: Michelle Briggs |  VIRIN: 230310-A-YU979-1584.JPG