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12 Street S.E. Bridge Replacement Project

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Project update – December 12, 2017

The new 12 Street S.E. Bridge, Zoo Road and Baines Bridge are now open!

While we have completed most of the improvements, construction work will still be continuing in the area until summer 2018. This work will require temporary lane and pathway closures. Please continue to follow detour signs in this area.

General construction impacts

  • Large trucks and other equipment will be moving in and out of the area.
  • There will be beeping noises when trucks back up – back-up beepers are required for safety reasons and cannot be turned off.
  • There will be general noise associated with construction.
  • Every effort will be made to keep dust to a minimum.

What will the new 12 Street S.E. Bridge look like?

See the two​ drawings of the new bridge design.

Project background

The 12 Street S.E. Bridge spans the Bow River on the south side of St. George's Island and is in need of replacement due to its age and deteriorated physical condition. The bridge, constructed in 1908, was originally designed to carry horse and buggy, as well as pedestrian traffic to St. George's Island. Now it is an important link for vehicles and people on foot or bikes, which provides access to and from 9 Avenue S.E. to Memorial Drive and points south. A new bridge will ensure this important link is maintained for the next 100 years.

Project scope

The bridge will be replaced with a new structure that will:

  • Provide two lanes for vehicle traffic with adequate lane widths, which could accommodate emergency vehicles and future Transit, and increase safety generally.
  • Be flood resistant.
  • Provide pedestrian/cycling access across the bridge and incorporate into existing pathway on the north and south ends of the bridge.
  • Be easier to maintain and will last for a long period of time (100 years).
  • Incorporate an historical/commemorative component recognizing the old bridge design.
  • Continue to provide access into the Zoo’s Administration area parking lot and building.


  • Preliminary design - fall 2015
  • Detailed design - winter 2016
  • Construction - spring 2016
  • Completion - winter 2017*
*Construction is very dependent on weather and site conditions. More information will be provided on updated timelines, but dates can change.

Future work

  • The concrete bridge deck will be installed after the structural steel is in place.
  • The roadway on the south side of the bridge will be rebuilt starting in July 2017.
  • The new bridge is scheduled to open to traffic in late 2017*.
*Construction work is dependent on weather and other conditions. Dates may change. Changes will be posted on the project web page and communicated via other channels.


$26 million

Road and pathway closures

  • The south pathway from 8 Street S.E. to New Street will remain closed during bridge construction work
  • Large trucks and other construction vehicles will be moving in and out of the area. Entry into the construction area is not allowed.
  • Pathway closures are implemented when they are necessary for construction. The detour must be along a sidewalk for pedestrians or along a roadway for cyclists.
  • See the Zoo Flood Mitigation Project for information on Zoo Road and pathway closures and detours around the closed areas.

Tree removals

See the FAQ about tree removals relating to the 12 Street S.E. Bridge project and the Zoo Flood Mitigation Project.

Public Art

A project-specific public art selection panel has selected artist Brandon Vickerd for the development and execution of a permanent public art project adjacent to the new 12 Street S.E. Bridge.

Related project – 9 Avenue S.E. Bridge

The 9 Avenue S.E. Bridge will also be replaced because of age and condition issues, but construction will not begin until the 12 Street S.E. Bridge Project and the Zoo Flood Mitigation Project are completed. Anticipated construction start is 2018. Visit the project web page for more information.


The City of Calgary will communicate with the public and impacted businesses about the construction before it begins and on an ongoing basis throughout construction. The web page will be the primary source for updated information.

More information

Please fill out the online form if you have questions or require more information.

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