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Twenty-three of the seventy-four dams of the Rideau Canal, including the seven stone arch dams, retain their original materials. Because of the importance of the dams as water control structures and in order to meet evolving safety standards for such structures, some of the original stone- masonry dams have been replaced over time using concrete. Fourteen of these early concrete dams represent the evolution of canal engineering and have been classified as CRM Level 2. The canal’s earth embankment dams retain their original materials, including their clay puddle cores, but have, in some instances, been reinforced with additional earth or stone.
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