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DMNP EA receives Provincial Approval - January 28, 2015

The Project Management Team for the DMNP EA is excited to announce that the DMNP EA received provincial approval on January 28, 2015. To view the Notice of Approval please visit the Ministry's website here.

This project will transform the existing mouth of the Don River (the “Don Mouth”) including the Keating Channel, into a healthier, more naturalized river outlet to the Toronto Inner Harbour and Lake Ontario, while at the same time removing the risk of flooding to over 290 hectares of urban land to the east and south of the river.

Project History

Environmental assessment: approved

  • Date submitted: March 3, 2014
  • Expiry of public comment period: April 21, 2014
  • Expiry of public comment period for Ministry Review: August 29, 2014
  • Decision date: January 28, 2015

Terms of reference: approved

  • Date submitted: May 5, 2006
  • Expiry of public comment period: June 5, 2006
  • Decision date: August 17, 2006

Environmental Assessment

The configuration of the existing Don Mouth was engineered primarily for the purposes of achieving transportation efficiency and to create additional land for port and other urban uses.  This has resulted in the current condition with lands vulnerable to flooding, a serious reduction in ecological function of the river mouth, and an area that is neither aesthetically pleasing, nor available for public use and enjoyment. 

The naturalization of the Don Mouth will establish a floodplain within the lower reaches of the Don River which will, over the long-term:
  • Improve aquatic and terrestrial ecological functions and provide enhanced linkages to upstream habitats;
  • Address sediment deposition, debris and ice jams;
  • Accommodate changes in precipitation, water flow, and Lake Ontario water levels resulting from climate change;
  • Enhance recreation opportunities and local aesthetics;
  • Provide natural habitat, pedestrian and bicycle trail linkages between Lake Ontario and the Don watershed; and,
  • Manage significant sources of contaminated soil within the Lower Don Lands.
Numerous other permits and approvals will be required under other statutes.

For more information on the DMNP EA please visit Other Recent Updates and here to view past EA activities.

Public Consultation

During the DMNP EA, six rounds of public consultation were held. Consultation activities were coordinated by the TRCA and included Technical Advisory Committee meetings, Community Liaison Committee meetings, public/stakeholder workshops and events, regular newsletters and website project updates and Aboriginal consultation. For more information on public and agency consultation please click here for past consultation activities.

Other Recent Updates

Video of Preliminary Design Delft3D Hydraulic Model Results for the Don Mouth

The Delft3D hydraulic model was used to determine the extent of flooding in the Port Lands that would occur under existing conditions if a Hurricane Hazel-like flood event were to occur in the Don Watershed.  The model was  selected for use as it best allowed for multi-dimensional flow as well as  Significant  sediment  movement and scour.  The following video depicts the 290 hectares of land that would be flooded from the Don River under this scenario. These lands would extend from Eastern Avenue out to Leslie Street, down to the Ship Channel and then east to the Inner Harbour.  The length of the arrows in the video provides information on the relative flow velocities that would occur:  the longer the arrow, the higher the flow velocity.   The flood protection components in the West Don Lands are also included removing flooding to the west.

This Delft 3D model was then used to depict the extent of flooding that would occur under the same Hurricane Hazel-like event, following implementation of Phases 1, 2 and 3 of the Don Mouth Naturalization and Port Lands Flood Protection Project.  The second video included below shows that approximately 250 hectares of land is no longer at risk due to flooding from the Don River as a result of the proposed works, with the majority of the remaining 40 hectares of flood vulnerable lands being located within the river valley system that is created by the implementation of the Project.


Final Submission: DMNP EA (March 2014)

Toronto and Region Conservation Authority (TRCA), on behalf of and in cooperation with Waterfront Toronto and the City of Toronto has completed the Environmental Assessment (EA) for the Don Mouth Naturalization and Port Lands Flood Protection Project (DMNP). As required under section 6.2(1) of the Environmental Assessment Act and according to the Terms of Reference approved by the Minister of the Environmenta on August 17, 2006, TRCA has submitted and received approval of its environmental assessment.

A copy of the DMNP EA can be downloaded by Chapter in PDF format below: