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4 Street S.W. Underpass Enhancement

Project update

Crews have completed the following work on the east side of the underpass and the sidewalk is now open to pedestrians:

  • ENMAX below grade ductbanks upgrade;
  • New sidewalk concrete and retaining wall repairs;
  • New handrails;
  • Concrete framework for new stairs connecting to 9 Avenue overpass;
  • Concrete framework for electrical room;
  • Improvements to the 3 Street turnoff for increased pedestrian safety.

Some work on the east sidewalk remains and will be completed in September 2018.

The west side of the underpass is now closed to pedestrians. Concrete work is currently ongoing on the west sidewalk and median. The expected completion date for this project including all work on the east and west sides of the underpass is November 2018.

About the project

Situated between 8 Avenue and 10 Avenue, the 4 Street S.W. underpass is a main gateway and key corridor for pedestrians and vehicles moving between the Beltline and downtown core, servicing over 8,000 pedestrians each day.

The 4 Street S.W. underpass is a priority for public realm improvements under the Council-endorsed “Downtown Underpass Urban Design Guidelines.” The underpass redesign is intended to address issues such as safety, connectivity, accessibility, vitality and beauty, and improving the overall comfort of pedestrians who use the underpass.

The City has completed planning and design for enhancements to the 4 Street S.W. underpass. The design developed by the marc boutin architectural collaborative (MBAC) integrates architecture, infrastructure and artwork into the redesign of the space. Internationally-acclaimed artist Krzysztof Wodiczko is also part of this design team charged with reinvigorating the underpass.

The enhancement project is part of a broader Centre City Underpass Enhancement Program underpass improvement program being facilitated by The City to improve the pedestrian environment and underpass connections between the Beltline and downtown communities. The City has been undertaking operational improvements to clean up and brighten other existing underpasses including 1 Street S.W., 5 Street S.W. and 8 Street S.W.

Project timeline

  • Fall 2016 – Spring 2017: Enmax completed utility upgrades beneath the east pedestrian walkway
  • Fall 2017: Construction on the enhancements begin
  • Fall 2018: Anticipated completion


The City is committed to keeping citizens informed about the project. Adjacent property owners and businesses will receive information updates as the project moves forward, and this webpage will be updated regularly.

For more details on the engagement process, visit the project’s engage page.

Fill out the 311 online form if you have questions or require more information.


This project will result in some underpass pedestrian and road restrictions and closures.

The east pedestrian walkway is now closed and will re-open once the sidewalk is rebuilt and enhancements to that side are completed. When the east walkway reopens, the west walkway will close for construction.

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