Project Update – April 12, 2021

What’s Happening in Traffic This Week

Trans-Canada Highway Reduced to One Lane Nightly

Every night this week (until Friday, April 16) from 10 p.m. to 5 a.m., the Trans-Canada Highway will be reduced to a single lane in each direction at the Stoney Trail interchange. The lane closures are needed to install overhang brackets on the bridge. Delays are expected.

Valley Ridge Boulevard N.W.

Later this week, crews will begin mobilizing on the west side of Valley Ridge Boulevard N.W. in preparation for work on the southbound lanes.

All work is weather dependent. Please check 511 Alberta and The City of Calgary’s traffic information map  for up-to-date information on traffic detours and speed reductions. For all other project information, please visit

We appreciate your patience during construction.

Bow River Bridge title banner

Cast-in-Place Segments

The Bow River Bridge is being constructed in segments using a balanced cantilever cast-in-place method. Now that’s a mouthful! Most people are familiar with conventional bridge construction where girders are placed between two vertical structures (abutments or piers) to form the bridge, but in segmental bridge construction the horizontal structure (the bridge) is constructed in segments. 

These segments can either be pre-cast, meaning they are fabricated off-site and delivered to site for installation, or the segments can be cast-in-place. On the Bow River Bridge the segments are being cast-in-place using a form traveler. The American Segmental Bridge Institute has a great animation showing how this works.

South Pier Lifts

A ‘lift’ is a specified height of concrete poured continuously, at one time. The concrete for the bridge piers is poured in lifts.

North Project title banner

Westbound Trans-Canada Highway Lanes Shifted to Detour

Early last week, the westbound Trans-Canada Highway lanes were shifted onto the detour. This is a huge project milestone, allowing road reconstruction to begin.

Trans-Canada Highway / Stoney Trail Interchange

Reminder – Controlled Blasting Resumes Today

Daily blasts start up again this afternoon with blasts scheduled between 3 p.m. and 5 p.m., Monday to Saturday. For more information, visit > controlled blasting.

Earthworks at Valley Ridge Boulevard N.W.

Filling the embankment west of Valley Ridge Boulevard N.W. is progressing quickly. About 145,000 cubic metres of fill is being added to raise the road profile about 7m.

South project title banner

Old Banff Coach Road S.W. Interchange

The centre pier spread footing has been poured and piling at the west abutment has begun.

Earthworks and Drainage South of Bow Trail S.W.

A culvert system is being installed where the wetland has been removed to maintain the hydrological connectivity between the upstream northwest area and the downstream southeast area.