Highway 404 Ramp Extension at Major Mackenzie Drive Class 'C' Municipal Environmental Assessment Addendum
Background
The City of Markham is recommencing the Highway 404 ramp extension at Major Mackenzie Drive Environmental Assessment (EA) project. The project was previously approved in 2009 following the Schedule ‘C’ Municipal Class Environmental Assessment Study (MCEA). As there has been a lapse of more than ten years, and the environment has changed, an addendum to the 2009 Environmental Study Report is required.
-
Notice of Addendum Completion
Share Notice of Addendum Completion on Facebook Share Notice of Addendum Completion on X (formerly Twitter) Share Notice of Addendum Completion on Linkedin Email Notice of Addendum Completion linkThe City of Markham has completed an Environmental Study Report Addendum to the approved 2009 Highway 404 Ramp Extension at Major Mackenzie Drive Environmental Assessment.
As part of the Study, the report will be available for public review to allow local residents, agencies and other interested members of the public an opportunity to review and provide input on the Addendum. Please use the links below to view the report.
Interested persons may provide written comments to the project team by November 26. 2026. All comments and concerns should be sent directly to Laura Chong (Hwy404ExtensionEAAddendum@markham.ca) at the City of Markham and Catherine Voytenkov (cvoytenkov@GFNET.com) at Gannett Fleming.
In addition, a request to the Minister of the Environment, Conservation and Parks for an order imposing additional conditions or requiring an individual environmental assessment may be made on the grounds that the requested order may prevent, mitigate or remedy adverse impacts on constitutionally protected Aboriginal and treaty rights. Requests should include your full name and contact information and received by November 26, 2026.
Requests should specify what kind of order is being requested (additional conditions or an individual environmental assessment), explain how an order may prevent, mitigate or remedy potential adverse impacts, and can include any supporting information.
Environmental Study Report Addendum:
Highway 404 Ramp Extension at Major Mackenzie Drive Environmental Study Report Addendum
Appendices:
Appendix A - Design Drawings, Design Criteria & Preliminary Structural Design Report Appendix B - Consultation Record Appendix C - Natural Environment Impact Assessment Report Appendix D - Stage 1-2 Archaeological Assessment Report & MCM Correspondence Appendix E - Noise Impact Assessment Report Appendix F - Air Quality Assessment Report Appendix G - Geotechnical Site Investigation Appendix H - Drainage & Stormwater Management Report Appendix I - Transportation Study Update Appendix J - Future Commitments for a 3:1 Slope
-
Approved 2009 Environmental Assessment
-
6562 ESR Proposed Road Extension Hwy 404_Major Mackenzie Dr .pdf (13.8 MB) (pdf)
-
6562 Appendix A.pdf (5.02 MB) (pdf)
-
6562 Appendix B.pdf (2.5 MB) (pdf)
-
6562 Appendix C.pdf (4.73 MB) (pdf)
-
6562 Appendix D.pdf (1.99 MB) (pdf)
-
6562 Appendix E.pdf (2.94 MB) (pdf)
-
6562 Appendix F.pdf (786 KB) (pdf)
-
6562 Appendix G.pdf (1.84 MB) (pdf)
-
