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Reputation: 4577. One of the functions of the Locks on the Lake Washington Ship Canal (the probable little body of water you're referring to) is to keep the salt water and fresh water separate.Lake Union and Lake Washington are above sea-level (Puget Sound) so that's why the locks are necessary.eputation: 4577. One of the functions of the Locks on the Lake Washington Ship Canal (the probable little body of water you're referring to) is to keep the salt water and fresh water separate.
The largest freshwater lake in the world is Lake Superior at 31,700 square miles. Lake Baical in Russia has the largest freshwater volume in the world at 23,600 km3 (5,700 cu mi), and is also the deepest at 5,370 ft.