Closure 4, part of the large lock center gate replacement project which began October 2023, will not extend past Nov. 13. Full chamber navigation, beginning Nov. 14, remains in effect.

SEATTLE - Army Corps officials are reminding the public of the first round of large lock center miter gate closures at Lake Washington Ship Canal and Hiram M. Chittenden Locks, starting mid ...

The gates have been at the Locks since they opened in 1917. Since then, they have become the nation’s busiest, with up to 50,000 vessels — most being recreational boats — passing each year.