Spring 2021 marked the start of a multi-year construction project to the bridge at Stoney Trail SE and the Bow River. The $60 million South Bow River Bridge project is part of the larger Calgary Ring Road and will improve traffic flow for approximately 53,000 vehicles that travel this crossing daily. It is important to complete this work now in anticipation of future Ring Road volume.

The westbound bridge will widen from 3 lanes to 4 lanes to accommodate future traffic demands. The eastbound bridge, which housed a narrow pedestrian crossing, required lifecycle maintenance, safety, and widening improvements. The eastbound bridge is being replaced to accommodate 4 lanes of vehicle traffic.

South of the bridge, a stand-alone pedestrian crossing will be constructed, providing a safer and more comfortable connection to the existing pathway system. Additional roadwork plans include widening and improvements to Stoney Trail between McLeod Trail, McKenzie Lake Boulevard and Cranston Boulevard.

The South Bow River Bridge project will support approximately 250 jobs and take about 3 years to complete.

Project details

Contractor: PCL Construction

Budget: $60M

  • In-stream berm construction on east and west banks
  • Construction of a new 4- lane eastbound bridge, with future 5- lane accommodation
  • Widening the existing westbound bridge to add a 4th lane, with future 5-lane accommodation
  • New stand-alone pedestrian bridge located south of the South Bow River Bridge that will connect to the existing pathway network
  • Widening and improvements to Stoney Trail between McLeod Trail, McKenzie Lake Boulevard and Cranston Boulevard
  • Modifications to the ramps at Sun Valley Boulevard, Chaparral Boulevard, and Stoney Trail to accommodate widening; westbound off ramp will be upgraded to a dual exit function


  • September 2020
    • The project was announced
  • January 2021
    • Contract awarded to PCL Construction
  • April 2021

    South Bow River Bridge

    • Berm construction began on the east side of the river in preparation for bridge demolition

    Stoney Trail

    • Widening of eastbound and westbound Stoney Trail began between Chaparral/Sun Valley Blvd and the Bow River

    Pedestrian Bridge

    • Berm construction completed on the east side of the river
  • May - June 2021

    South Bow River Bridge

    • Demolition of the eastbound bridge began (through July and August)
    • Stage 1 (of 2) vehicle detour implemented; expected to remain throughout the 2022 construction season. Eastbound traffic shifted to westbound lanes. See detour map below.
  • July 2021

    South Bow River Bridge

    • Bridge demolition continues
      • Berm construction begins on the west side of the river; hauling material from east to west berm will occur

     Stoney Trail

    • Roadway surfacing begins
  • August - September 2021

    South Bow River Bridge

    • Piling begins for bridge construction
    • Expected completion of west berm; removal of remaining girders and piers
    • Reconfiguration of berms for new bridge construction
    • Chaparral Blvd to eastbound Stoney Trail will convert from a yield condition to a merge lane

    Stoney Trail

    • Roadway surfacing continues

    Pedestrian Bridge

    • Berm construction to be completed on the west side of the river
    • Piling to begin for abutments and piers
  • 2022 / 2023
    • Stage 2 (of 2) vehicle detour implemented. Westbound traffic shifted to eastbound lanes. See detour map below.
    • Construction continues through the 2022 / 23 season
    • Completion of eastbound Stoney bridge
    • Completion of pedestrian bridge

Traffic impacts

During construction, on-site signage will share information about traffic impacts. Please plan ahead and visit 511 Alberta and the City of Calgary traffic map for up-to-date traffic impacts.

River traffic

River traffic will be permitted throughout the course of construction. Boat spotters will be deployed on an as-needed basis to guide traffic as appropriate. Intermittent stoppages may apply and will be communicated as required.

Bow River Pathway and Park access detours

During construction, pathways, pathway access closures and detours will be in place and shared through onsite signage. Please plan ahead and visit the City of Calgary Parks – Pathway and Bikeways Map.

This is a multi-year project with construction continuing beyond one construction season. Future closures and detours can be expected and will be communicated as they arise.

South Bow River bridge detour and closure map
Photo of map overview
Photo of contruction detour

Active construction site

This is an active construction site with heavy machinery and numerous safety hazards. To ensure the safety of site workers and members of the public, closed off areas are clearly identified with onsite signage, netting and/or line.

Trespassing through these areas is considered dangerous and will be enforced throughout the course of construction.

The Government of Alberta and PCL Construction thank the public for respecting these closures and finding alternate routes.

We are aware of the impact this has on nearby communities and the contractor has committed to keeping pathways open as much as possible, if appropriate and safe to do so.


Closures and detours


Detour: Stage 1 (of 2) is currently implemented. Eastbound vehicles are detoured to westbound lanes; expect delays. See detour map below. Stage 2 expected in 2022/23 construction season.

Rotary Park access: Pedestrian and vehicular access from McKenzie Meadows Drive to Rotary Park (Fish Creek Provincial Park) will be closed intermittently for the duration of the project.

McKenzie Meadows Driving Range: Vehicle access via McKenzie Meadows Drive SE will remain open.


The project working hours are Monday – Saturday, 7 am to 10 pm, and Sundays and holidays, 9 am to 10 pm Pedestrian access is open outside of these hours, if it can be safely accommodated.

Pathway detour: detour 6 kms of north/south pedestrian pathway on the east side of the river between Rotary Park and the South Fish Creek Bridge will apply for the duration of the project.

Pedestrian access across the bridge (east/west): Permanently closed until the new pedestrian bridge is open

  • Pedestrian access across the river will be via the South Fish Creek Bridge. Use Chaparral/Sun Valley Blvd or McKenzie Lake Blvd crossings, if travelling from south of the bridge.

Pedestrian access under the bridge (north/south): Intermittent closures will apply for the duration of the project. It will remain open when safe and appropriate to do so, and based on site conditions, public safety, and construction schedules.

  • Pedestrians to use McKenzie Lake Blvd or Chaparral/Sun Valley Blvd crossings

Sign up for updates

To receive updates about the South Bow River Bridge project, please sign up for email or SMS text updates below.

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The information collected through the South Bow River Bridge – Sign up for updates page will be used for the purpose of sending you updates about the project.

The collection of personal information is authorized under section 33(c) of the Freedom of Information and Protection of Privacy (FOIP) Act.

If you have any questions about this collection of personal information, you may contact the project team at [email protected].com or at 403-200-6935.


For more information on the South Bow River Bridge:

Hours: 8:15 am to 4:30 pm (open Monday to Friday, closed statutory holidays)
Phone: 403-200-6935
Toll free: 310-0000 before the phone number (in Alberta)

For information about construction, please contact:
Estella Petzold
Project Coordinator
Alberta Transportation
Email: [email protected]

For information about impacts to pedestrian pathways, please contact the City of Calgary by dialing 311.

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