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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.
Flathead Lake is the largest natural freshwater lake in the western US (by surface area) outside of Alaska. Lake Tahoe has more water than Flathead because it is significantly deeper (nearly 1650 ft vs. 380 ft). The Great Salt Lake in Utah is significantly larger than Flathead but is salt, not fresh water. And there are numerous larger man-made reservoirs. Average surface temperatures of the Lake range from 2.3Â°C (36Â°F) in mid-January to 13.5Â°C (56Â°F) in mid-June to 20.3Â°C (68Â°F) in mid-August.