I have experienced many a Lock, but never a Lift Lock. Stopping in Peterborough on our way to Algonquin (sorry, forgot this page earlier) we stopped to view this hydraulic construction. It's pretty amazing actually, and we were lucky enough to be able to experience it first hand. It takes approximately ninety seconds to complete the lift, with 8 tonnes of water weighing you down and 6 tonnes lifting. Definitely a masterpiece of engineering.
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