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Seattle, Washington / History

Lake Washington Ship Canal

An eight-mile engineering marvel that links freshwater Lake Washington and Lake Union to the saltwater of Puget Sound, featuring the nation's busiest navigation locks.

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Lake Washington Ship Canal
Joe Mabel, CC BY-SA 3.0

What is the Lake Washington Ship Canal known for?

The canal is an eight-mile channel that links freshwater Lake Washington and Lake Union to saltwater Puget Sound. It transformed Seattle into a major metropolitan port city and shaped the city's social, physical, and environmental history.

Is it free to visit?

Yes, admission is free.

What are the hours?

The park is open daily from 7 a.m. to 9 p.m. from April through September, and from 7 a.m. to 7 p.m. from October through March.

What can I see at the Hiram M. Chittenden Locks?

The complex includes two navigation locks, a spillway, a fish ladder that allows salmon to move between the lake and Puget Sound, gardens, and a visitors' center.

When was the canal built?

Construction began in 1911 under the U.S. Army Corps of Engineers. The canal was officially opened and dedicated on July 4, 1917, and was later completed in 1934.

What should I check before going?

Use Gyde for context, then check official sources for current hours, tickets, construction, and closures.

What to know

The Lake Washington Ship Canal is a critical piece of Seattle's infrastructure, spanning eight miles to connect the saltwater of Puget Sound with the freshwater of Lake Washington and Lake Union. Construction began in 1911 under the direction of the U.S. Army Corps of Engineers, with the project being designed by district engineer Hiram Chittenden. The canal was officially opened on July 4, 1917, and later fully completed in 1934. At the heart of the complex is the Hiram M. Chittenden Locks, which are recognized as the busiest navigation lock in the United States and the largest on the West Coast. The locks utilize parallel dual-sized chambers to conserve water and prevent saltwater intrusion into the freshwater lakes. This engineering feat allows the complex to regulate freshwater levels and move boats between differing water levels. Beyond navigation, the complex includes a gated spillway, a visitors' center, and a fish ladder. The fish ladder is a vital environmental tool that allows salmon to move between the saltwater of Puget Sound and the freshwater lakes. The site attracts more than 1 million visitors annually, welcoming a mix of recreational users and nature enthusiasts. Historically, the canal transformed Seattle into a major metropolitan port city, shaping the city's social, physical, and environmental history. While early planners envisioned heavy use by coal and naval vessels, the locks are now predominantly used by pleasure craft, reflecting the shift in the city's maritime maritime history.

Visitor tips

  • The park is open daily from 7 a.m. to 9 p.m. April through September and 7 a.m. to 7 p.m. October through March.
  • Admission is free, making it a great stop for any budget.
  • Visit the fish ladder to see salmon migrating between the lake and Puget Sound.

Nearby context

The canal complex is located 1.5 miles east of the Puget Sound entrance, serving as a gateway between the city's inland lakes and the Pacific gateway of the Puget Sound.

Sources

Evidence and links