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Don Mouth Naturalization and Port Lands Flood Protection Project

The Don Mouth Naturalization and Port Lands Flood Protection Project (DMNP) Environmental Assessment (EA) was completed by the Toronto and Region Conservation Authority (TRCA) on behalf of and in co-operation with Waterfront Toronto and the City of Toronto. This project will transform the existing mouth of the Don River including the Keating Channel, into a healthier, more naturalized river outlet to the lake, while at the same time, addressing the risk of flooding to over 290 hectares of urban land to the east and south of the existing river.

A team of consultants led by AECOM (formerly Gartner Lee Limited) were retained by TRCA to assist with undertaking the EA, while a team of Consultants led by Michael Van Valkenburg Associates (MVVA) were retained to assist Waterfront Toronto and the City of Toronto in the development of Precinct Plans and a Master Plan Class EA associated with the Lower Don Lands (lands surounding the future Don River Mouth). 

The Lower Don Lands Master Plan was a parallel planning process led by Waterfront Toronto and the City of Toronto, that integrated a solution for the municipal servicing needs for the proposed redevelopment around future realignment of the Don Mouth. 

The DMNP EA was submitted to the Ministry of Environment on March 3, 2014 and received Provincial approval on January 28, 2015.  Approvals of the LDL Master Plan Class EA were confirmed with the approval of the DMNP EA.

The goal of the DMNP Project is to establish and sustain the form, features, and functions of a natural river mouth within the context of a revitalized City environment while providing flood protection up to the Regulatory Flood.

The objectives are to:

  • Naturalize and rehabilitate the mouth of the Don River utilizing an ecosystem based approach
  • Provide flood protection for Spill Zones 1 and 2
  • Maintain the provision for navigation and existing flood protection through sediment, debris and ice management
  • Integrate existing infrastructure functions that could not be reasonably moved or removed (including road, rails, utilities, trails, and power)
  • Encourage additional compatible recreation, cultural heritage opportunities and public/handicap accessibility
  • Contribute to the revitalization and sustainability of the waterfront and coordinate with and inform other planning and development efforts and associated certain and foreseeable infrastructure
  • Design and implement this project in a manner consistent with TWRC's Sustainability Framework and applicable provincial legislation

The Conceptual Design for the DMNP 

Conceptual Design DMNP

Currently TRCA is working closely with Waterfront Toronto and the City of Toronto to develop a framework in which both the DMNP EA and LDL Master Plan Class EA can be advanced to detailed design and ultimately, construction. Efforts are also underway to ensure that other planning initiatives, such as the Gardiner EA, TTC Relief Line, and Port Lands Framework Plan, are integrated with the approvals for both the DMNP EA and LDL Master Plan Class EA.