Rouge River Tributary 5 Environmental Assessment

The City of Markham is conducting a Schedule 'B' Municipal Class Environmental Assessment (EA) study for the Rouge River Tributary 5 watercourse. The study area is a key area for future development and, under existing conditions, the lands around the watercourse have potential flood risks during large storms. The purpose of this study is to assess potential flood mitigation and stormwater servicing for Tributary 5 of the Rouge River, and establish options to provide stormwater management solutions to facilitate future development of lands within the Markham City Centre.

The main Tributary 5 channel generally flows in a northerly direction and connects into the Rouge River. The project study area is primarily bounded the Metrolinx Rail corridor to the west, Highway 407 to the south, Kennedy Road to the east and just north of Unionville Gate to the north. Tributary 5 begins at the southeast portion of the study area at Highway 407 and connects to the Rouge River north of Unionville Gate. Please see the attached figure for the study area location.

Background investigations and assessments are currently underway and will inform the development of the alternative solutions and selection of the recommended solution.

Get Involved

We value your input in the development of the optimal solution to address flooding concerns in the Tributary 5 study area. A pre-recorded virtual Public Information Centre (PIC) is currently scheduled to take place from February 25, 2025 to March 25, 2025. Once the PIC has started, a link will be posted onto this website, which will direct you to the virtual PIC presentation. You will have the opportunity to review the pre-recorded PIC presentation video and provide your feedback during the set PIC time period. The video will present an overview of the study purpose, existing conditions, evaluation of alternative solutions, the recommended solution, and project next steps.

A Notice of the pre-recorded virtual PIC has been sent to stakeholders and members of the public, and is also posted on this webpage under the Documents tab.

Other Ways to Get Involved

1. Stay updated: Save this website to your browser favourites.
2. Provide your feedback: Contact the Project Study Lead listed on the sidebar and provide your feedback or ask questions you may have regarding the project.