4th Avenue Flyover Rehabilitation
Both lanes of the flyover are now open for peak hours! Thank you for your continued patience while we complete the finishing touches to the 4 Avenue Flyover Bridge.
Project update – August 2025
Paving is complete, the bridge has reopened to two lanes for peak hours, and we are just one major milestone away from completing our work on the 4th Avenue Flyover. Here’s what commuters can expect in the home stretch of construction:
Closures to westbound Memorial Drive
- Beginning from 9 Street N.E. on August 28, the right-hand, westbound lane of Memorial Drive will be closed during off-peak hours for approximately 1-2 weeks to lay the foundations for the roadway sign installation.
- A 24/7 closure of the same lane will then be required starting on September 8 for approximately a week to complete installation. Delays can be expected, so we encourage commuters to plan ahead.
- Additional off-peak closures to Memorial Drive may be required in mid- to late September to put the finishing touches on the sign structures.
Rolling nighttime full bridge closures
- To install the bridge railings, full bridge nighttime closures will be required beginning in mid-September and are expected to last until mid-October. The closures will be short in duration and disruptions to motorists will be minimal.
4th Ave. Flyover with paving complete - June 7, 2025
About the project
The 4th Avenue flyover was built in 1982. This flyover carries two lanes of traffic towards 3rd Street S.E. As one of the main routes into downtown, the overall structure spans 430-meters crossing over the Bow River.
Originally built in 1982, Calgary’s longest bridge structure, the 4th Avenue Flyover needs major repairs and improvements after 42 years of daily service for motorists entering the Downtown. The City is investing $12.5 million to help ensure the bridge continues to be functional, reliable, and in good condition for commuter use for decades to come. Construction will begin in early April 2024 and is anticipated to be complete by late fall 2025.
Overlooking 4th Avenue Flyover
Underneath 4th Avenue Flyover
Daytime photo of the west-side barrier
Overlooking 4th Avenue Flyover and Flyover Park
Night photo overlooking 4th Avenue Flyover - traffic heading into downtown
Night photo of the west-side flyover barrier
Scope of work
The project scope of work includes:
- rebuilding existing concrete barriers and adding lighting
- replacing existing concrete paving overlay with a polymer modified asphalt (PMA) overlay
- replacing existing expansion joints, and other general concrete repairs across the structure
Benefits
The project benefits include:
- improving the condition of the flyover, including the addition of streetlights.
- extending the service life of the flyover by roughly 35 years.
- improving one critical link in the transportation network to help with Calgary's continued growth in the coming years.
Project timeline
- Design Completion: 2023
- Tender to Market: October 2023
- Construction Start: Spring 2024
- Construction Completion: Fall 2025
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Contact Us
Have questions or want to learn more about the projects? Contact the project team at: 4aveflyoverrehab@calgary.ca
Budget
Estimated Budget: $12.5 million
Frequently asked questions (FAQs)
Why is 4th Avenue Flyover in need of repair?
Ongoing regular maintenance along with timely major rehabilitations are important to keep bridges/flyovers safe and reliable, while minimizing future costs and extending the service life of this type of structure. The project should greatly improve one critical link in the transportation network. These types of improvements help with Calgary's continued growth in the coming decades.
Will lane closures still be required on the bridge?
Yes, single lane closures will still be required over the summer, but will only occur during off peak hours.
Is construction on the bridge complete now?
The bridge has reopened both lanes of traffic to motorists during peak hours, however work is still required to fully complete the project, including signage installation. Completion of the project is anticipated for fall 2025.
What kind of impacts can motorists still expect before the project is fully complete?
Single lane closures are still anticipated during off peak hours while work wraps up over the next few months.
Though disruptions to Calgarians are anticipated to be minimal, we ask that motorists still use caution when travelling through the area. As the site is still an active construction zone, we ask motorists to proceed with caution and obey all posted signage.
Can any closures to Flyover Park be expected in the last few months of construction?
No closures of Flyover Park are anticipated.
Will the remaining construction work affect access for emergency services and/or transit?
Emergency service and transit access has been maintained throughout the project, with the exception of full bridge closures. In the event of a full closure, detour routes are communicated to prevent service disruptions.