Lake Union

Lake Union is a freshwater lake in central Seattle, Washington, immediately north of the city’s downtown and surrounded by residential and commercial neighborhoods. It covers about 580 acres and is a focal point for urban boating and waterfront recreation.

The lake is notable for its concentration of floating homes and houseboats, active seaplane operations, and a high density of marinas and small craft rentals. Popular shoreline attractions include Gas Works Park and waterfront cultural institutions, and the lake hosts community boating events and sailing programs.

The waterway became more regionally connected after the Lake Washington Ship Canal and the Hiram M. Chittenden Locks opened in 1917, linking Lake Union and Lake Washington to Puget Sound and enabling larger-scale marine traffic and industrial development along the canal.

Geographically the lake sits within Seattle city limits, bordered by the South Lake Union, Eastlake, Westlake and Northlake neighborhoods, with downtown Seattle immediately to the south.

• Size and uses: Relatively small urban lake of about 580 acres (approximately 2.3 square kilometers), popular for seaplanes, houseboats and shoreline parks.
• Viewing spots: Best vantage points for lake activity and skyline views include Gas Works Park and the west-facing piers of South Lake Union.

What to See #

• Gas Works Park: Converted industrial site turned public park on the lake's north shore known for panoramic views of the lake and Seattle skyline; contains picnic areas and the preserved remains of a former coal gasification plant.
• Museum of History & Industry (MOHAI): Museum focused on Seattle and Puget Sound history located on the lake's south shore; houses regional collections and rotating exhibitions and moved to its South Lake Union building in 2012.
• Center for Wooden Boats: Nonprofit educational center preserving and demonstrating wooden boats; operates a public boatyard and offers rentals and sailing instruction on the lake.
• Hiram M. Chittenden (Ballard) Locks: Part of the Lake Washington Ship Canal system completed in 1917; the locks allow vessel passage between the lake system and Puget Sound and regulate water levels.