Project Update

September 9, 2022

What’s Happening in Traffic This Week

September 9 – 21: Intermittent Overnight Lane Closures on Trans-Canada Highway

Starting tonight and lasting approximately two weeks, there will be intermittent lanes closures between 6 p.m. and 7 a.m. each night in both directions on the Trans-Canada Highway. Please expect delays.

Paving on 17 Avenue S.W.

Lane closures and single lane alternating traffic will be required for paving on 17 Avenue S.W. as preparations to shift traffic to the new bridge continue. Please expect minor delays.

Valley Ridge Boulevard N.W. / 109 Street S.W. to Westbound Trans-Canada Highway Ramp Closed

The permanent ramp from Valley Ridge Boulevard N.W. / 109 Street S.W. to westbound Trans-Canada Highway is anticipated to open in late September.

Standing on the ramp looking east at spreading and compacting the first lift of granular base course (gravel) for the pavement structure

All work is weather dependant. 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.

Closing In

The hot, dry weather this summer has allowed girder segments to be poured consistently with few interruptions. In July and August, 15 girder segments were cast-in-place. All segments should be poured by the end of this year, connecting the second bridge across the river.

July 6, 2022
July 11, 2022
July 27, 2022
August 9, 2022
August 15, 2022 – formwork removed from the abutment superstructure (box girders)
August 17, 2022

Man-made Wetland for Stormwater Management

The stormwater management system on the North project includes two man-made wetlands. Some man-made wetlands are meant to replace natural wetlands. In this case, however, the wetlands are part of the stormwater management system and are designed to improve water quality.

Stormwater wetlands function similarly to stormwater ponds. Both capture and temporarily store surface water runoff and improve water quality by allowing sediments and pollutants to settle in the pond instead of being conveyed to our rivers and streams. The primary difference between a man-made wetland and a stormwater pond is the use of vegetation in a shallow pool to remove pollutants.

Excavating the south end of the man-made wetland
Placing gravel on top of the clay liner to protect it from erosion
Covering the bottom of the wetland pond with filter fabric and topsoil

Mainline Stoney Trail Bridge Approaches

Approaches are the transition areas over the abutment backfill between the bridge and the road. This backfill area is covered with rebar and concrete.

Looking south at compacting backfill for the northbound and southbound Stoney Trail bridge approaches

Bow Trail S.W. Interchange and Pathway Underpass

These aerial photos from April and August of this year show the progress on the pathway underpass and interchange construction. This interchange provides access in all directions (compared to partial access at Old Banff Coach Road and 17 Avenue S.W.), resulting in a larger footprint and more infrastructure to construct.

Looking east at the pathway underpass in April (left) and August (right) 2022

Looking west at Bow Trail S.W. interchange construction; Bow Trail to northbound Stoney Trail loop ramp and connection to 100 Street S.W. over the ravine highlighted

Highway 8 Interchange

Construction is active across the entire Highway 8 interchange site.

Northbound Stoney Trail Bridge

Moisture is added to the south abutment backfill to achieve compaction requirements

Basketweave Bridge (Northbound Stoney Trail On-ramp / 17 Avenue S.W. Off-ramp)

The concrete girders for the bridge between Highway 8 and 17 Avenue S.W. measure approximately 50m long and weigh about 68,000kg or 150,000lbs

Eastbound Highway 8 / Stoney Trail

Spreading and compacting backfill for the eastbound Highway 8 carriageway
Crushed pit run – small rocks used extensively to form the base of road structures – compacted on the completed subgrade for eastbound Highway 8