Stage B construction on Calgary’s Bearspaw South Feeder Main underway
Posted May 11, 2026 9:45 am.
The City of Calgary is beginning the next stage of construction on the Bearspaw South Feeder Main on Monday.
Stage B construction on the beleaguered pipe includes installing a new parallel steel feeder main along 34 Avenue NW between 73 Street and 89 Street.
However, crews are starting with “cross connection work” to the future replacement pipe to connect to the wider water system on 77 Street NW between 33 and 34 Avenue and 83 Street NW between 33 and 34 Avenue.
Once completed, construction for the feeder main on 34 Avenue NW will proceed in June 2026, starting at 79 and 80 streets, and between 85 and 86 streets.
The City will use an open-cut construction method, excavating within the public right-of-way to install the new pipe. This involves digging a trench and restoring the surface to its pre-construction state.
“An open-cut approach was selected for several operational reasons, including that it is the fastest option for urgently replacing the BSFM,” the city said.
This is expected to be completed by October 2026.
As a result, residents in the area should expect traffic impacts, detours, noise, dust, temporary parking restrictions and short-term access changes during construction.
The city is encouraging drivers to follow posted detours and use extra care when travelling through residential streets.
Meanwhile, officials say Stage A microtunneling construction, from the Shaganappi Pump Station to 73 Street NW on the west side of the Bow River, remains on track.
More information on the ongoing construction is on the city’s website.
