Drone image of the humber river with the city of Toronto on the horizon.

Report Highlights

The Humber River, Etobicoke Creek, and Credit River watersheds currently have a lower amount of forest and wetland areas than recommended by federal guidelines.

Highway 413 would cut through many of the remaining natural areas of all three watersheds, impacting ecological functionality and  preventing them from reaching federally recommended natural cover goals.

Highway 413 would destroy more than 65 per cent of the remaining habitat of the endangered redside dace in Canada.

Highway 413 would further degrade the existing poor water quality in the most stressed watershed of Etobicoke Creek with new urbanization projected to increase aquatic salt concentrations by up to 49 per cent throughout the entire watershed.

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Introduction

Watersheds in southern Ontario have become heavily urbanized over the years as urban sprawl has paved over large portions of the province’s natural areas.

Poorly planned and unnecessary infrastructure development outside of existing cities and towns has damaged ecological systems and continues to be a concern throughout these watersheds. This provincial disregard for the health of key watersheds continues as the government of Ontario continues to push for more unnecessary and environmentally harmful development projects, such as Highway 413. 

Highway 413 is an unnecessary project and will accelerate urban sprawl in the Halton and Peel regions. The government’s preferred route of Highway 413 will destroy large natural areas of forest, meadow, river and wetland habitat within the Humber River, Etobicoke Creek, and the Credit River watersheds. The lower reaches of each of these watersheds have been significantly urbanized over the past six decades, negatively impacting critical natural areas that provide ecological services and water quality. The watersheds are threatened with further degradation from this highway and the urban sprawl it will enable.

Aerial view of the Credit River
The Credit River
Map highlighting where the proposed highway 413 route will cut through watersheds.

All three watersheds already face serious health risks from existing urbanization and do not meet recommended federal guidelines.

HUMBER RIVER WATERSHED

YTP_Watershed Report_Humber River makeup

ETOBICOKE CREEK WATERSHED

YTP_Watershed Report_Etobicoke Creek makeup

CREDIT RIVER WATERSHED

YTP_Watershed Report_Credit River makeup

If Highway 413 is built, it will deal a devastating blow to all three watersheds.

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of remaining endangered Redside Dace habitat located throughout the Humber River and Credit River watersheds will be destroyed.

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increase in chloride concentrations in waterways throughout the Etobicoke Creek watershed due to urbanization.

Construction of a bridge over a river

Key Findings

Highway 413 will transform freshwater habitats in each watershed into unliveable, salty waters toxic for many freshwater species like the endangered redside dace.

Highway 413 and accompanying development will destroy natural areas home to approximately 65 at risk species that live in the Credit River watershed.

Highway 413 will cut through high priority habitat connectivity areas in the Humber River and Etobicoke Creek watershed. These are critical areas that help prevent biodiversity loss.

Conclusion

is proposing Highway 413 as a way to prioritize and accelerate this type of growth onto farms, forests, and wetlands within three watersheds in the GTA.

Highway 413 will cut through three of Ontario’s watersheds: the Humber River watershed, Etobicoke Creek watershed, and the Credit River watershed. Each of these watersheds have seen a significant amount of urbanization over many decades and are threatened with the pressures of urban development and the impacts on natural heritage systems.

Highway 413 will impact each watershed by altering the natural cover and water quality levels through the areas where the proposed highway’s route will be constructed. These impacts will lead to further ecological degradation in each watershed through biodiversity loss, habitat destruction and fragmentation, increased impervious surface, and elevated concentrations of chloride in waterways due to enhanced road salting activity.

aerial shot of a suburb encroaching on a forested area

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Join us in asking federal MPs to re-designate Highway 413 for a new Impact Assessment. Proper federal oversight will ensure that the highway doesn’t destroy vital natural areas or put endangered species at risk.

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Acknowledgements

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