The Ontario Ministry of Transportation (MTO) is improving the Highway 400 and Innisfil Beach Road interchange in the Town of Innisfil.

Road closures

There will be a series of road closures associated with this project. Follow the detour routes and signage, and allow for extra time to reach your destination. 

Phase 1

A portion of Innisfil Beach Road, at Highway 400, was closed from July 4 to July 27, 2023. Innisfil Beach Road underneath the Highway 400 bridge has reopened following the completion of this phase. 

Phase 2

There will be no access from Highway 400 Northbound to Innisfil Beach Road Eastbound or Westbound from July 25 to September 1, 2023. The construction completion date is estimated and subject to change. Temporary on-ramps are open from:

  • Innisfil Beach Road Westbound to Highway 400 Southbound 
  • Innisfil Beach Road Eastbound to Highway 400 Northbound 

A signed detour route is set up to direct motorists from the Highway 89 exit to Innisfil Beach Road.

Construction status 

MTO began construction on April 20, 2022. Construction is expected to continue until 2025. During this construction phase, motorists may experience temporary disruptions including: 

  • Construction traffic
  • Temporary traffic diversions
  • Noise
  • Dust

Disruption to services such as water, gas and electric are not expected.

Project overview

The project includes:

  • Replacement of the bridges on Highway 400 at Innisfil Beach Road and the Barrie-Collingwood Railway
  • Reconstruction of Innisfil Beach Road interchange
  • Reconstruction of the existing six-lane Highway 400 mainline to match the reconstructed interchange
  • Drainage improvements
  • Full illumination
  • Relocation of traffic signals to the new ramp terminals
  • Improvements to roadside safety


In 2004, the MTO undertook a Planning and Preliminary Design Study and Class Environmental Assessment to address transportation deficiencies along 30 km of Highway 400 from 1 km south of Highway 89 to the Junction at Highway 11. In 2017, a Class Environmental Study Update and Transportation Environmental Study Report addendum was completed that confirmed the 2004 approved plan for the Innisfil Beach Road interchange was still valid.

The Highway 400 bridge over Innisfil Beach Road requires replacement. The replacement structure will accommodate the future ultimate widened Highway 400. As part of the planned highway improvements, the nearby Barrie-Collingwood Railway bridge will also be replaced and Highway 400 – Innisfil Beach Road interchange ramps modified to match the new structure. These works were approved under the previously completed studies in 2004 & 2017 Addendum.

The MTO and project consultants issued a Notice of Completion and Design and Construction Report Submission in 2020.