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Chittenden Locks updates large locks extended closure schedule

The Gulf Cajun commercial vessel passes through the large lock at Lake Washington Ship Canal and Hiram M. Chittenden Locks, Seattle, Washington, from the Puget Sound into Lake Washington, July 19, 2022.

Posted on January 4, 2023

The upcoming large lock extended closure schedule will close the large lock to all vessel traffic during:

Closure #1                                 10/16/2023   11/14/2023

Single Chamber Navigation     11/15/2023   11/29/2023

Closure #2                                  11/30/2023   12/29/2023

Single Chamber Navigation     12/30/2023     1/13/2024

Optional Closure                           1/14/2024     2/12/2024

Single Chamber Navigation       2/13/2024   10/14/2024

Closure #3                                  10/15/2024   11/13/2024

Single Chamber Navigation     11/14/2024   11/28/2024

Optional Closure                         11/29/2024   12/28/2024

Fully Operational                    12/29/2024

Closure dates are projected and may change as the project schedule is finalized. The extended closures will facilitate demolition, concrete construction, and installation and commissioning of the new miter gates. For each closure cycle, the large lock will close for no more than 30 days and will open for 15 days for vessel traffic.

The small lock will remain open during these periods and can pass vessels up to 28 feet wide and 123 feet long.

Most machinery and equipment, including the large lock center gate, are original to the Locks. The improvements to this 105-year-old navigation infrastructure will help the Army Corps supply reliable and dependable navigation over the years to come.

Check our official Locks Closure page for outage information and schedule changes.

The Army Corps owns and operates the Chittenden Locks, the busiest in the nation. Nearly 50,000 vessels lock through each year.

For updates and more information about the Chittenden Locks, follow us on Facebook and Twitter at and


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