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May 18

48th Avenue Bridge Update

Posted on May 18, 2018 at 1:48 PM by Melissa Henderson

Another on-site meeting was held between representatives from the PSA, the City, and AMEC Foster Wheeler on May 17, 2018. PSA provided another update on the progress of the bridge construction.

PSA reiterated that they were happy with the system in place for traffic accommodation, and had no safety issues or concerns to report. After hearing this, and inspecting the site, the City is happy with how things are moving forward in a safe manner.

Similarly, the City is quite pleased with the manner in which environmental health and protection is being handled. In order to construct the back wall of the bridge, trenches had to be dug along the edge of the lake. To keep the work area dry, water from the lake had to be constantly pumped out of the trench. The water that is removed from the trenches is full on soil particles and debris, and would cause harm to the environment if allowed to be dumped directly back into the lake. Along with the yellow sediment curtains in place, PSA has also set up small on site ponds that will allow for the water to be filtered as it naturally feeds back into the environment.

On the east side of the soon-to-be bridge, the construction of the backwall is about 65% complete. Within the next two weeks, one of the three track hoes will be moved to the west side to continue making progress with that portion. Throughout this, PSA continues to remove asphalt and debris to make room for the new roadway.

PSA has a lot planned for the next two weeks. Starting next week, the box culverts for the pedestrian walkway will be delivered and begin to be installed. The plan is the start on the north side of the roadway and work to the south. As mentioned before, work with the track hoes will be continued on the west side. As well, initial planning has begun for the relocation of the signal lights.

Overall, the City is quite pleased with the progress being made. Current predictions of the project’s completion place it in early September. PSA is working hard to get the project back on schedule.

The City would again, like to thank citizens for their patience and cooperation during this project. If you have any questions or concerns, please contact the Engineering Department at 780-672-4428 or at

Pumping of Water
Water from the trench is pumped into a temporary holding pond within the construction area, where it is filtered to remove sediments before being released to Mirror Lake.

Trackhoe transferring backfill
Trackhoe in foreground transferring backfill material into the trench on the east side of the east pilings and backwall. Trackhoes in background working on removal of asphalt and concrete from former portion of 48 Avenue.

PSA compacting backfill
PSA compacting new backfill material behind the steel backwalls. The worker in the trench is standing roughly in the middle of the future roadway, but is still a few metres below the elevation of the new roadway. PSA equipment is standing by to place more backfill material into the trench. At the time that this photo was taken, two of the three sections of backwall had been placed in the trench. The top section will be installed just before the bridge girders are placed.

AMEC inspecting the steel backwalls
Inspectors from the City’s project engineer (AMEC Foster Wheeler) are inspecting a section of the recently installed steel backwalls. These corrugated steel sheets are installed on the outside of the abutment pilings, and will be used to prevent soil from under the future roadway from falling into Mirror Lake.