The Soo Locks are the most well know engineering marvels in Sault St. Marie. A little way down the river east of the locks is another engineering marvel. Over 1300 feet long the St. Marys Falls Hydroelectric Plant was the second-largest plant when it was constructed in 1898. Second only to the hydro plant at Niagra Falls. It is still in operation today producing electricity for the easter half of the Upper Peninsula.
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