Large Lock Center Gate Replacement Project: Extended Closure 11/30-12/29

Phase II of our large lock miter center gate replacement project begins Nov. 30, 2023. This phase will focus on concrete installation. The large locks will be closed to vessel traffic from 12:00 a.m. Nov. 30, 2023, and will re-open Dec. 30, 2023.  

Large Chamber Scheduled Closures

Large Chamber Projected Closures

Stakeholder Public Meeting Q&A

Notes from February 15,2023 Stakeholder Meeting held at Lake Washington Ship Canal Visitor Center. Operations Plant Manager Jon Hofstra facilitated the meeting. 

Attendees: Nine persons attended in person; five attended via Webex.

Agenda covered:  Gate closures, Successes, Project Closures specifics, Q&A 

 

Q: The Argosy Christmas Ship uses the large lock thanksgiving weekend. Can closure# 5 be moved to 12/2/24?

A: We don’t know about that… we'll find an answer and get back to you. 

 

Q: Who was the contract awarded to?

A: Manson Construction.

 

Q: You have three gates, what about the other two?

A: We're focusing on the center gate and using this as a “lessons learned.” The other two gates are not on the radar now, we will take our time.

 

Q: (online attendee) What are the correct dates, since the slides say different things?

A: Slide# 10 show the correct dates. We'll also email the updated slides to stakeholders. 

 

Q: (online attendee) Will you email the presentation?

A: Yes, we will email the link to the presentation (recording) and the presentation handout to stakeholders.

 

Large Lock Center Gate Extended Closure Schedule

Large Lock center gate extended closures schedule:

Closure #1: Demolition                                         10/16/2023 - 11/14/2023

Full Chamber Navigation                                      11/15/2023 - 11/29/2023

Closure #2: Concrete Installation                       11/30/2023 - 12/29/2023

Full Chamber Navigation                                         12/30/2023 - 1/13/2024

Closure #3: Additional Season 1                               1/14/2024 - 2/12/2024

Full Chamber Navigation                                           2/13/2024 -10/14/2024

Closure #4: Installing Gates                                   10/15/2024 - 11/13/2024

Full Chamber Navigation                                        11/14/2024 - 11/28/2024

Closure #5:  Additional Season 2                           11/29/2024 - 12/28/2024

Fully Operational:                                                      12/29/2024

Please note:

  • For each closure cycle, the Large Lock will close for no more than 30 days and open for 15 days for vessel traffic.
  • Closure windows are projected and may change as the Contractor's project schedule is finalized.

Small Chamber Scheduled Closures

Small Chamber Projected Closures

  • Feb 24-March 13, 2025

Lock Chamber Information

The Large Locks can be operated as three (3)  different chamber configurations. 

Full Chamber includes both the East and West Chambers.

760 feet  Available Length

80 feet  Available Width

East Chamber

385 feet   Available Length

80 feet   Available Width

West Chamber

327 feet Available Length

80 feet  Available Width

The Small Locks is a single lock chamber:

123 feet   Available Length

28 feet Available Width