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Dundas BRT

Dundas BRT - Mississauga West

Existing Environmental Conditions – Key Findings

The following key findings outlined in the slides below have been determined based on environmental existing conditions studies conducted to-date. These findings will be used to help inform the development of the preferred design and the completion of the environmental impact assessment.  

Separate TPAPs will be completed for the following study areas:  



Kipling Transit Hub to Etobicoke Creek   

Mississauga East

Mississauga East  

Etobicoke Creek to Confederation Parkway

Mississauga West

Mississauga West  

Confederation Parkway to Ninth Line

Existing environmental conditions – Mississauga West

Air Quality

  • Background air quality levels are predominantly below respective provincial and federal ambient air quality criteria and standards; however, some contaminants show exceedances, including:
    • Benzo(a)pyrene;
    • Benzene; and
    • Nitrogen dioxide.
  • Contaminants showing higher levels of background concentration above 80% of the federal standards includes particulate matter (PM2.5).
  • Meteorological data from the Toronto Pearson Airport over a five year period (2016 – 2020) shows predominant wind direction blowing from northwest, west and southwest, and low-speed wind predominance from the southeast.

Natural Environment

  • The study area includes a variety of urban, residential and industrial areas which are divided by several natural features including watercourses, riparian areas and vegetated corridors.
  • Crossing the study area, Mary Fix Creek and the Credit River provide habitat to a variety of fish species, with the Credit River also providing migratory corridors for populations of salmon and trout.
  • Several natural heritage features are found within the study area, including the Credit River at Erindale Areas of Natural and Scientific Interest (ANSI) and Erindale Park near the Credit River.
  • A wide variety of migratory birds nest within the study area.
  • Species at Risk are known to occur within the study area, including Barn Swallow, Chimney Swift and Snapping Turtle.

Local wildlife corridors exist in several areas primarily associated with watercourse, riparian areas and valley lands for small, medium and large mammals as well as turtles. Several other wooded areas within the study area also provide corridors for bats, including the Big Brown Bat.

View of the Credit River flowing through Erindale ValleyView of the Credit River flowing through Erindale Valley.
Source: AECOM, 2021.

Socio-Economic & Land Use

  • Mississauga West is consistent with provincial and municipal plans and policies as it is anticipated to enhance public transit connections to the area and support economic development objectives.
  • Directly fronting Dundas Street, land uses consists of low-rise and mid-rise commercial and residential uses, with low-rise residential and commercial behind.
  • A range of community amenities (including institutional and recreational uses, and community resources) are present within the study area. Erindale Park is a key destination for Mississauga residents.
  • Several development applications for various land use types are either in progress or recently approved within the study area.

The demographic profile within the study area is relatively consistent with the Mississauga City-wide average.

Noise & Vibration

  • The Mississauga West segment is generally a mix between commercial and residential uses in a busy urban environment.
  • Dundas Street is considered an arterial roadway which is intersected by other arterials (e.g., Mavis Road) and minor residential or commercial access roads.
  • The ambient sound levels at the most impacted noise sensitive locations (e.g., dwellings) are dominated by a combination of existing Dundas Street and the intersecting roads.
  • Currently, no known existing vibration concerns due to road traffic. However, heritage buildings have been identified in close proximity to Dundas Street.

View of the Credit River flowing through Erindale ValleySt. Peter’s Anglican Church in Erindale on the north side of Dundas Street West at Mississauga Road.
Source: AECOM, 2021.


  • Eleven registered archaeological sites were identified within one km of the current project area boundaries.
  • A visual inspection to confirm areas of archaeological potential versus areas of urban disturbance found that the project area consists primarily of residential and commercial development along the Dundas Street East corridor, roadways and highways (e.g., Highway 403, Erin Mills Parkway, Winston Churchill Boulevard and Mavis Road), with some areas of manicured lawn and park land.
  • Results of the Stage 1 background research and field review, including mapping and determination of archaeological potential, will be summarized in the Stage 1 archaeological assessment report.

Cultural Heritage

  • Twenty-three built heritage resources and cultural heritage landscapes have been identified within the project area boundaries.
  • A preliminary impact assessment will be completed to identify impacts of the project on the built heritage resources and cultural heritage landscapes.
  • Mitigation measures and monitoring activities will be developed in the Cultural Heritage Report: Existing Conditions and Preliminary Impact Assessment.

View of the Erindale Community Hall located at 1620 Dundas Street West, within the Erindale Village Cultural Heritage LandscapeView of the Erindale Community Hall located at 1620 Dundas Street West, within the Erindale Village Cultural Heritage Landscape.
Source: AECOM, 2021.

Climate Change & Sustainability

  • A Greenhouse Gas Inventory is being developed that incorporates the emissions during construction and operations and will include any changes as a result of the Dundas BRT.
  • Dundas Street is subjected to riverine flooding, which will be included in the Risk Assessment. For Mississauga West, the major areas of riverine flooding are at the Credit River.
  • The application of Metrolinx’s broader sustainability initiatives currently underway will be included in the design, construction and operation of the Dundas BRT with the goal of improving environmental and social outcomes. In addition, recommendations will be made to reduce greenhouse gas emissions along the corridor.

Traffic & Transportation

  • Within the Mississauga West corridor, Dundas Street varies between six-lane and four-lane cross-sections, and in many locations a centre two-way left-turn lane is present.
  • Continuous sidewalks are provided on both sides of Dundas Street within Mississauga West, with no dedicated cycling facilities provided.
  • The largest directional traffic volumes along Dundas Street are 3,000 vehicles in the morning peak hour and 2,100 vehicles in the afternoon peak hour.
  • Most intersections operate at acceptable levels of service in both the morning and afternoon peak hours.
  • In both the morning and afternoon peak hours, the most congestion occurs west of Winston Churchill Boulevard. Other intersections with major arterial roadways (Mavis Road, Winston Churchill Boulevard, and Erin Mills Parkway) operate with poor levels of service in the peak hours.

Vehicular traffic travelling westbound on Dundas Street at The Credit Woodlands intersection in MississaugaVehicular traffic travelling westbound on Dundas Street at The Credit Woodlands intersection in Mississauga.
Source: AECOM, 2021.

TPAP: next steps

Toronto and Mississauga West

Following this round of engagement, Metrolinx will:

  • Use feedback from the public and information gathered through the existing environmental conditions studies to continue detailed analysis required to identify the preferred design and proposed stop locations in Toronto and Mississauga West;
  • Present the analysis of pinch point alternatives and preferred options during a future round of engagement in 2022;
  • Commence the TPAPs for Toronto and Mississauga West; and
  • Identify potential impacts of the project and proposed mitigation measures to present in the Draft EPRs for Toronto and Mississauga West, to share with the public in 2022.

Would you like to share any insights or concerns regarding these environmental studies?

Provide Your Feedback

Pinch points: Mississauga East and Mississauga West

Erindale Valley

Erindale Valley area pinch point 

  • The Erindale Valley area is constrained due to the need to protect the natural environment of the Credit River Valley and Erindale Park. There are also several heritage sites that need to be considered between Mississauga Road and The Credit Woodlands:

    • Potential alternatives include a single reversible BRT lane or two BRT lanes, and widening along Dundas Street (that is, to the north or about the centreline)

Pinch Points

The Dundas BRT - Pinch Points - Erindale Valley Area

The Erindale Valley area is constrained due to the need to protect the natural environment of the Credit River Valley and Erindale Park. There are also several heritage sites that need to be considered between Mississauga Road and The Credit Woodlands.

Alternatives: Dundas Street in Mississauga – Erindale Valley pinch point

Key considerations for the Erindale Valley pinch point include:


  • Property acquisition required beyond the Official Plan right-of-way (ROW) to accommodate all contemplated infrastructure needs (dedicated BRT guideway, four general purpose lanes, cycle tracks, sidewalks and amenity/utility space)  

  • Numerous buildings located close to the property/ROW line  

  • Significant natural heritage features  
  • Numerous cultural heritage resources and landscapes

During round 1 engagement, members of the public identified:


Opportunities to:

  • Implement the Dundas BRT project as part of the City of Mississauga’s Dundas Connects Master Plan

Concerns about:  

  • Cycling infrastructure and safety  

  • Pedestrian infrastructure and safety  
  • Environmentally sensitive areas  
  • Dedicated transit lanes  
  • Landscaping (aesthetics) 

The project team arrived at two alternatives and are reviewing each for potential benefits and drawbacks. Both alternatives will also be analyzed against the same criteria used to determined the best performing alternative for the Cooksville pinch point: 

Alternative 1: Reversible BRT Lane


  • Lower capital cost with only a single dedicated transit lane  
  • Fewer property impacts and building displacements  
  • Minor impacts to natural features  


  • Does not maintain continuity of full BRT lanes through corridor 
  • Less reliable due to general traffic impedance with notable transit delays 
  • Potential for residential and built heritage resource displacements

Alternative 2: Full Median BRT (to the North) 


  • Maintains continuity of median BRT 
  • Provides a full multi-modal cross section, including buses, auto traffic, pedestrians and cyclists 
  • Provides transit service reliability with less potential for service interruptions or delays 


  • Higher capital cost to implement  
  • Potential for property impacts along the south and north sides of Dundas Street  
  • Potential for commercial, residential and heritage resource property displacements  
  • Increased impacts to natural features