East Don River behind 30 Northline Road Erosion Control and Slope Stabilization

Toronto and Region Conservation Authority (TRCA), in partnership with the City of Toronto, has proposed to undertake remedial erosion control works to provide long-term protection for a City of Toronto maintenance yard located at 30 Northline Road, in the City of Toronto.

Project Map

The project area  is located adjacent to 30 Northline Road, south of Eglinton Avenue West, atop a steep valley slope along the northeast side of the East Don River. The area of concern is the south-eastern extent of the City of Toronto maintenance yard adjacent to 30 Northline Road.

Figure 1. Approximate location of project area denoted with a red circle

Learn More About the Project

Project Background

Erosion issues have been a concern at 30 Northline Road for some time, especially since the July 8, 2013 severe storm event, which resulted in massive flooding and damage to river and valley systems across the Greater Toronto Area (Figure 2).

Ongoing erosion and slope instability has created a risk to City of Toronto works yard buildings located at the top of the slope, the Metrolinx railway bridge abutment at the slope toe of western edge of the project area, and overall public safety.

In 2014, TRCA retained Sarafinchin Associates to conduct a detailed erosion risk and slope stability investigation. The findings of the investigation identified that there is risk of additional slope failure and that remedial works are recommended to provide long-term protection.

In 2015, TRCA initiated a Class Environmental Assessment (Class EA), planned in accordance with Conservation Ontario’s Class Environmental Assessment for Remedial Flood and Erosion Control Projects (as amended 2013), the approved process for this type of undertaking. A Notice of Intent initiating the project was published in the North York Mirror and East York Mirror on October 29, 2015.

TRCA retained Terraprobe Inc. to develop detailed designs for slope stabilization and erosion control and complete a geomorphic assessment and supplemental Slope Stability and Erosion Risk Assessment (SS&ERA) of the surrounding valley system.

The SS&ERA completed to date concluded that toe erosion due to lack of protection below the City of Toronto works yard is causing progressive oversteepening and slumping throughout the valley slope.

TRCA intends to host a Community Liaison Committe (CLC) for all interested stakeholders in Summer 2017 to present the findings of the geotechnical investigation and preferred alternative solutions to provide long-term protection for a City of Toronto maintenance yard at 30 Northline Road, in the City of Toronto.

Figure 1. View of the valley system adjacent to the study area at 30 Northline Road, City of Toronto. Source: TRCA, 2016
Figure 2. View of City of Toronto works yard at 30 Northline Road, City of Toronto. Source TRCA, 2016. 

Scope of Work

Next steps include:

  1. Evaluating a range of alternatives solutions and identifying the preferred alternative(s);
  2. CLC meeting to discuss alternative solutions and identifying the preferred alternatives (s);
  3. Preparation and filing the Class EA Project Plan for the 30 day review period;
  4. Finalizing detailed designs of the preferred alternative(s);
  5. Obtaining all necessary permits and approvals to proceed to construction; and
  6. Commencement of construction works including access road and staging/stockpiling tentatively in fall 2017, pending receipt of necessary permits and approvals
Please Note: TRCA is currently in the planning stages of this work, including obtaining permits and approvals, collecting background data and reviewing preliminary designs. Implementation of works is not scheduled at this time.

Construction Information

Construction information showing work area, access areas, trail closures, alternative routes, tentative schedule and highlights will be updated once the project commences in Fall 2017 (tentative).

Public Consultation

In accordance with the Class EA process (Figure 5), the first point of public contact occurred with the publication of the NOI in the North York Mirror and East York Mirror on October 29, 2015. Notices were sent to Aboriginal groups, community groups, homeowners in the vicinity of the project site, and government regulatory agencies including Conservation Ontario (CO), the Ministry of Environment and Climate Change (MOECC), and the City of Toronto. The NOI requested that individuals contact the Project coordinator if they wish to participate further in the EA process or be kept informed about the Project’s status.

2015-10-26 Northline Road (30) NOI FINAL


Figure 5. Class Environmental Assessment process

Contact Us

The Planning Team is located at TRCA’s Boyd Field Centre in Vaughan:
Restoration and Infrastructure Division, Engineering Projects
9755 Canada Company Avenue
Vaughan, Ontario
L4H 0A3

For more information regarding this project, please contact Courtney Rennie, Project Manager.

Courtney Rennie, Project Manager I 
9755 Canada Company Avenue, Vaughan
L4H 0A3
Office: (416) 661-6600
E-mail: courtney.rennie@trca.on.ca

Current News

June 2017

TRCA regrets to inform you that the Community Liaison Committee (CLC) scheduled for Tuesday, June 27, 2017 at Flemingdon Park Public Library has been cancelled due to an absence of confirmed attendees. Should you wish receive information on the proposed study, please contact the Project Manager, Courtney Rennie.

Click the link below for CLC#1 presentation material:

30 Northline Rd CLC Meeting #1 – Prezi Presentation FINAL