Toronto and Region Conservation Authority (TRCA) is proposing erosion control and channel restoration works to protect sanitary sewer infrastructure north of Steeles Avenue East in the City of Markham.
This project was funded in part by Infrastructure Canada’s Disaster Mitigation Adaption Fund, as part of the Toronto Region Ravine Erosion Mitigation Project.
LATEST PROJECT UPDATES
Phase 1 – Tree Removals are currently scheduled to occur in March 2026. For more details, see Construction Information.
Project Location
The German Mills Creek Channel Restoration Project – Site 4 is located along a section of German Mills Creek, northeast of the intersection of Leslie Street and Steeles Avenue East in the City of Markham.
The project is protecting York Region’s Leslie Collector Sewer within the ravine on private lands.
Learn More About the Project
Project Background
A geomorphic assessment of a portion of German Mills Creek was conducted in 2015, which identified the project area as an area of concern related to potential impacts to the sanitary sewer infrastructure within the area.
The existing crib retaining wall is failing and continued erosion is causing scouring of the channel posing a risk to sanitary sewer infrastructure.
Scope of Work
The German Mills Creek Channel Restoration Project – Site 4 is being undertaken in partnership with the York Region to perform erosion control and protect sanitary sewer infrastructure along the project area. The scope of work includes:
- Removal of a failing crib retaining wall
- Bank erosion control measures such as installation of vegetated revetments including woody debris features
- Bed erosion control measures such as installation of riffles
- Post-construction site restoration: 382 plantings will be conducted in the German Mills Creek sub-watershed as part of this project
Construction Information
The project is proposed to occur in two phases:
Phase 1 – Tree Removals
- Scheduled Start date: March 2026
- Scheduled Completion Date: March 2026
Phase 2 – Erosion control/Channel Restoration
- Scheduled Start date: Summer 2026
- Scheduled Completion Date: Fall 2026
Temporary construction access to the project area will be from Leslie Street, however Leslie Street and the Lake-to-Lake trail will be open for the duration of construction.
For your safety, stay clear of the project area and equipment. Please obey all project signage and site personnel.
Public Notices
The Notice of Construction is available for viewing here:
Contact Us
For more information regarding this project, please contact:
WonJai Jang, Project Manager
Erosion Risk Management | Restoration & Infrastructure
9755 Canada Company Avenue, Vaughan ON L4H 0A3
(437) 994-9215
wonjai.jang@trca.ca