What is the Broadway Subway Project doing on Cambie Street?
An expanded interchange station is taking shape underneath and around Broadway-City Hall Station.
On Cambie Street south of W. Broadway, our crews are building the future connection between the southbound platform of the Canada Line and the future Millennium Line extension. The work area on the west side of Cambie Street between W. Broadway and 10th Avenue has been excavated to 16 metres at the deepest point. Once complete, elevators, escalators and stairs will carry passengers down to the Millennium Line concourse level. From there, a tunnelled walkway will lead passengers underneath the Canada Line tracks to the Millennium Line platform. This will create a seamless, quick underground connection for passengers with no need to exit the fare-paid zone.
A further tunnelled walkway is under construction directly underneath the Canada Line entrance to connect to the northbound platform.
Crews excavate under the Canada Line entrance (June 2023)
Where the second tunnel will connect to in the excavation on Cambie Street
Cambie Combined Sewer
To create space for the expanded station, crews previously relocated the Cambie Combined Sewer under Cambie Street. The sewer is “combined” because it carries both sewage and water runoff from five Vancouver neighbourhoods to wastewater treatment facilities. As part of the city’s critical infrastructure, crews were unable to shut down the pipe. Instead, the team had to create a bypass system to move flows from the section being replaced and connect a new pipe. Once the tie-in was complete, the bypass system was removed. The new section is now fully in use.
Relocating the Cambie Combined Sewer included updating the pipe diameter from 1.8 metres to 2.4 metres. The Broadway Subway Project team opted to increase pipe diameter to better prepare the system for population growth and increased heavy rainfall due to climate change. To give you a sense of the increase in the pipe size, a person would now be able to stand up in the pipe without issue!