Highway 400 / 6th Interchange
Municipal Class Environmental Assessment (EA) Review

PUBLIC INVOLVEMENT

Public Involvement Overview

MTO and the Town of Innisfil are committed to an open consultation and engagement program that engages and involves members of the public, non-government organizations (NGOs), Simcoe County, Indigenous communities, and regulatory agencies. As such, the Project Team welcomes comments regarding the Highway 400/6th Line Interchange project.

All comments received, with the exception of personal information, will become part of the public record.

Notifications

Notification of project milestones (Study Commencement, Study Update, and ESR Addendum) has be announced through a notice posted on this website and the Town’s website. External agencies, Indigenous communities, and those on the study mailing list were also notified through direct mail or email.

• Notice of Study Commencement

• Notice of Study Update

• Notice of Environmental Study Report Addendum

Environmental Study Report Addendum

The review of the EA-approved interchange recommended the following design changes: 

• Updates to interchange design to reflect current standards and practices;

• Realignment of the proposed interchange ramps;

• Replacement of the proposed roundabouts with traffic signals at the ramp terminals;

• Replacement of the existing Innisfil Creek culvert crossing under Highway 400 with new bridges; and

• Installation of new bridges for the proposed  West-to-South (W-S) and South-to-East/West (S-E/W) ramp crossings of Innisfil Creek.

Please review the Environmental Study Report Addendum below and provide comments by September 12, 2025:

• Environmental Study Report Addendum (Report)

• Environmental Study Report Addendum (Appendices)

Supporting technical reports are available on Resources webpage.