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Troutbrooke Drive Slope Stabilization Project

Toronto and Region Conservation Authority (TRCA) has completed remedial erosion control works along a section of the Black Creek valley, adjacent to Troutbrooke Drive in the City of Toronto, where slope instability and ongoing erosion are creating a risk to residential properties.

Project Update

Toronto and Region Conservation has completed construction of the Troutbrooke Slope Stabilization Project, along a section of the valley wall located in Downsview Dells Park immediately adjacent to 35 – 51 Troutbrooke Drive, in the City of Toronto. This project was approved under the Environmental Assessment Act on May 14, 2011.


Construction commenced immediately upon the receipt of all required approvals, and was completed in 2012.  

Project Background

In the spring of 2009, a resident contacted TRCA to express concern over the instability of the valley wall and the potential long-term risk to their home. TRCA retained a professional engineering firm, Terraprobe Inc., to complete a detailed slope stability and erosion risk assessment to confirm the cause(s) and extent of the problem, the results of which indicated that major erosion control work was required to provide long-term protection for nine (9) residential properties along Troutbrooke Drive within the study area.

Based on Terraprobe’s findings TRCA staff identified the Troutbrooke Drive erosion site as a priority for remedial works and recommended at Authority Meeting #8 held on Friday October 29, 2010 that a Class Environmental Assessment (Class EA) be undertaken. The Authority approved the recommendation, and a Notice of Intent was published on Friday November 5, 2010 in the North York Mirror to inform the public that a Class EA was commenced for the design and implementation of remedial works along the Black Creek valley wall, adjacent to Troutbrooke Drive.

Project Purpose

The purpose of the Troutbrooke Slope Stabilization Project (the Project) is to provide long-term, low maintenance protection against erosion and slope instability that will prevent future property damage, reduce the risk to public safety, and which is compatible with the surrounding physical, biological, social and cultural environment.

Planning Mechanism for the Undertaking

TRCA must conduct its remedial flood and erosion control projects in accordance with the Environmental Assessment Act (EAA). Recognizing that common elements exist in addressing flood and erosion problems, a more efficient approach to environmental assessment was developed by Conservation Ontario for all conservation authorities known as the Class Environmental Assessment for Remedial Flood and Erosion Control Projects (Class EA). The Class EA approach is considered a suitable means for the planning of remedial flood and erosion control projects because it provides a consistent, streamlined process that ensures compliance with Environmental Assessment Act (EAA) requirements.

TRCA submitted the following Environmental Study Report in support of the Troutbrooke Slope Stabilization Project for approval by the Ministry of the Environment under subsection 7(1) of the Environmental Assessment Act (EAA) on April, 2011.

Troutbrooke Slope Stabilization Project pdf
Troutbrooke Slope Stabilization Project - Appendix pdf

Public and Agency Consultation

The Class EA process provides that all views respecting a proposed remedial flood or erosion control project be taken into consideration during the planning and design of remedial flood and erosion control projects. The Community Liaison Committee (CLC) provided a venue to allow concerned citizens, local interest groups and non governmental organizations to voice issues of public concern as well as assist in the planning and design process of the project.

For more information, please contact:

Laura Stephenson
Project Manager at (416) 661-6600 ext 5296