Dewdney Trunk Road between Cawthra Court and Pier Drive in Coquitlam will be fully closed to all road users, 24 hours a day, seven days a week, starting Tuesday, October 6, 2026. The City of Coquitlam says the closure is expected to remain in place for approximately four months for the Metro Vancouver Dewdney Trunk Water Main Project.
The City of Coquitlam road closure notice posted October 4, 2026, and its official location map set the closed section and detours.
This is a bigger change than the earlier stage of the same project: the August work between Locarno Drive and Cawthra Court kept single-lane alternating traffic moving, while this stretch closes to vehicles entirely.
What road users should know
Closure: Dewdney Trunk Road is fully closed (24/7) between Cawthra Court and Pier Drive. The official map labels it "No vehicle traffic."
When: Begins Tuesday, October 6, 2026. Expected to last approximately four months.
Driver detour: Use Mariner Way and Barnet Highway.
Local traffic only: Dewdney Trunk Road between Mariner Way and Barnet Highway will be limited to local traffic only.
Pedestrian detour: Walk via Dolphin Street and Mariner Way.
Plan ahead: The City asks road users to plan an alternate route or allow extra time, follow construction speed limits, watch for crews and heavy machinery, and obey signs and traffic personnel.
Transit: Check TransLink.ca and posted signs for any bus stop or route changes in the area.
Who is affected
Anyone who drives, walks or rides Dewdney Trunk Road between Cawthra Court and Pier Drive, including people heading between Mariner Way and Barnet Highway, needs the signed detours from October 6 onward. Expect the change to last into early 2027 based on the City's four-month estimate. Re-check the City notice for updates.
Source
- City of Coquitlam: Road Closure, Dewdney Trunk Road between Cawthra Court and Pier Drive (posted October 4, 2026)
- Official location map (City of Coquitlam DocumentCenter)
- Metro Vancouver Information Centre: 604-432-6200 | After-hours emergency: 604-451-6610 | icentre@metrovancouver.org (subject: Dewdney Trunk Road Water Main, Mariner Way Section)
- Project updates: metrovancouver.org (search "Dewdney Trunk Road Water Main Mariner Way Section")
