Union Bay (Seattle)

Union Bay is a body of water located in Lake Washington, Seattle, Washington. The bay has the Laurelhurst neighborhood to the north and the Montlake and Madison Park neighborhoods to the south. The Evergreen Point Floating Bridge, which carries State Route 520, crosses over a portion of the bay.

Marsh Island and Foster Island are located in Union Bay, and are connected to the mainland (and each other) by the Arboretum Waterfront Trail and the Foster Island Trail. Union Bay ends at the eastern opening of the Montlake Cut, which connects Union Bay with Portage Bay (an arm of Lake Union) to the west—this marks the beginning of the Lake Washington Ship Canal, which runs through Seattle and connects Lake Washington to Puget Sound.

When the level of Lake Washington was dropped nearly nine feet in 1916 as a result of the opening of the Ship Canal, a good portion of Union Bay and Union Bay Marsh and wetland became dry land, furthered by landfill and, belatedly, sanitary landfill. The marsh and much of the bay was filled from 1911 to 1967. The Montlake Landfill (in use from 1926 to 1967) was the fictional home of television clown J. P. Patches, resident 1958 through 1981. The University Village shopping center (1956) and most of the east main campus of the University of Washington (UW) but for Husky Stadium sit on this land today. What remains of Union Bay Marsh is the restored remnant within the Union Bay Natural Area of the UW.

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