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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 Great Lakes are the largest freshwater system on Earth. The Great Lakes contain an estimated 5,500 cubic miles (22,700 cubic kilometers)of waterâa fifth of all the liquid surface fresh water on Earth. And, it's enough to submerge the continental United States in nearly 10 feet of water.