Lake Union is a freshwater lake entirely within the Seattle, Washington city limits.
Origins
A glacial lake, its basin was dug 12,000 years ago by the Vashon glacier, which also created Lake Washington and Seattle's Green, Bitter, and Haller Lakes.Name
Lake Union received its present name from Thomas Mercer, who in 1854 predicted that canals would someday join Lake Washington to Puget Sound in a "union of waters. The Duwamish called it "Small Lake" (Lushootseed: XáXu7cHoo, literally "small great-amount-of-water," the diminutive form of the word used for Lake Washington).Industry
Boeing began production on Lake Union in 1916. Shipyards, wharves, and sawmills have also dotted the shore.Recreation
Lake Union's proximity to and scenic views of Seattle make it a popular recreational spot. Seaplanes operated by Kenmore Air land on and take off from the lake several times a day during the summer. Pleasure boats from Lake Washington pass through on their way to Puget Sound. The Center for Wooden Boats holds a yearly wooden boat festival.
Parks
Gas Works Park is the largest park on Lake Union and the most popular for Seattleites and visitors. It is the venue for summer concerts and one of the two major Fourth of July fireworks shows in Seattle. Other parks ring the lake, clockwise around the compass from Gas Works which is nearly due north: North Passage Point Park, South Passage Point Park, Fairview Park, Terry Pettus Park, and South Lake Union Park.Floating Homes
Floating homes line the east and west sides of Lake Union. In Sleepless in Seattle, the character played by Tom Hanks lived on one of these homes. 
Connections to other bodies of water
Part of the Lake Washington Ship Canal system, water flows into the lake from Lake Washington through the Montlake Cut, and out via the Fremont Cut on its way to Puget Sound. Before construction of the canal, Lake Union emptied into Salmon Bay via a creek which followed roughly the same course as the Fremont Cut does today.Salinity
Because of the connection via the Hiram M. Chittenden Locks to the salt water of Puget Sound, there is some saline contamination, which increases in the summer as the inflow rate from Lake Washington decreases and the locks open more frequently for pleasure craft.Geography
Three major streets are named in relation to the lake: Westlake Avenue, which runs along its western shore from Downtown to the Fremont Bridge; Eastlake Avenue, which runs along its eastern shore from Cascade to the University District, and Northlake Way, which runs along its northern shore from the University District past Gas Works Park to the edge of Fremont.Several neighborhoods take their name from the lake: Eastlake, Westlake, Northlake, and South Lake Union.
References
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Last updated on Thursday July 17, 2008 at 20:40:59 PDT (GMT -0700)
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