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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.
1 The largest lake in the world by area is the Caspian Sea, with 394,299 kmÂ². The largest freshwater lake by area is Lake Superior (82,414 kmÂ²), part of the Great Lakes of North America.  The longest freshwater lake is Lake Tanganyika, with a length of about 660 km.