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As documented in the approved TESR, construction duration is anticipated to take place over 1 year to 1.5 years. Highlights are detailed below:

  • Construction start: Spring 2024

  • Short-term overnight closure of Highway 401: 

    • Bridge Demolition: April 13, 2024​

    • Girder Erection: June 2024

    • Deck Panel Erection: July 2024

  • Complete closure of Dorchester Road at Highway 401: April 2, 2024 - October 2024

  • Highway 401 eastbound on/off ramp closure: July 2024 - October 2024

  • Highway 401 westbound on/off ramp closure: April 2024 - October 2024​

  • Construction complete: June 2025.

Construction Timing

Construction Updates

Work on the replacement deck for the Dorchester Road bridge over Highway 401 is planned to take place beginning on Friday August 23, 2024, and continuing overnight until the morning of Saturday August 24, 2024. During this time, there will be intermittent and full closures of eastbound and westbound Highway 401 lanes as follows:

  • August 23, 2024 eastbound Highway 401 lane closures beginning at 10:00 pm and full highway closure between 11:00 pm and 1:00 am

  • August 24, 2024 full westbound Highway 401 closures between 1:00 am and 3:00 am 

  • All eastbound and westbound lanes of Highway 401 are tentatively scheduled to re-open by 5:00 am on August 24, 2024

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Eastbound Highway 401 traffic will use the existing Dorchester Road ramps to cross Dorchester Road. Westbound Highway 401 traffic will use the signed detour routes along Westchester Bourne, Cromarty Drive and Elgin Road. More information and a map of the detour routes can be found here under the Highway 401 Detour section.

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