A massive Calgary construction project won't wrap up until 2028
The construction of the TransCanada Sanitary Trunk is underway in Calgary’s west end, but residents won’t see the results until 2028.
The project is a brand-new 8.5-kilometre sanitary trunk line that will meet the demands of west Calgary and surrounding areas like the town of Cochrane.
The estimated cost for the sanitary trunk is $136 million, and it will run from east to west along the TransCanada Highway, under Stoney Trail.
City of Calgary
The detailed design phase of the project has been completed, and now it is on to the construction phase, which is projected to run until late 2026.
After construction is finished, the project will then move onto the landscaping phase, which is expected to be completed by late 2027 to early 2028.
West Calgary and Cochrane are currently serviced by the Valley Ridge Sanitary Trunk, which is nearing capacity, prompting the construction of the new TransCanada Sanitary Trunk.
According to the project’s website, “This project is essential to meet sewage demands in the west part of Calgary, given recent population growth and provides adequate capacity for future residential and commercial development to take place.” It also states it will help with odour in the community of Valley Ridge.
City of Calgary
As of November 2025, crews are completing microtunnelling work north of the TransCanada Highway, with active construction sites near several manholes east of Stoney Trail. Microtunnelling is a construction method that allows crews to dig and install pipes underground, which minimizes environmental, health and traffic impacts. It will be used for 7.3 kilometres of the project, while 1.2 kilometres will be open trenches.
Traffic will be impacted in some parts of the city due to construction.
You can find more details on the project online.