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Construction starts on new Lower Don Bridge for Ontario Line subway

  • Press Room
  • Construction starts on new Lower Don Bridge for Ontario Line subway


New line will see nearly see nearly 400,000 daily boardings.

May 2 – Major construction has started on the new Lower Don Bridge that will carry Ontario Line trains across the Don River between the Corktown and Riverside communities. 

Ontario Line lower don bridges

Rendering of the future Ontario Line bridge over the lower Don River at dawn. Artist renderings subject to change.

In 2023, construction crews cleared the area, relocated a watermain that went beneath the railway, and shifted the existing train tracks.  This work was completed to prepare the site for the start of bridge construction.  

The tracks needed to be shifted because the Ontario Line will run alongside GO Trains in the shared rail corridor in the area. Shifting the tracks makes it possible for continued GO service during Ontario Line construction and makes space for new Ontario Line tracks. 

With the site now cleared and utilities moved to a new spot, construction on the new bridge’s east support structure (or abutment) is starting with installation of two concrete and steel piers that will support the foundation of the bridge. Once the east side is completed, we’ll move onto the west support structure.  

The new bridge will be built north of the existing Lower Don Bridge over the Don Valley Parkway and the Don River.

Ontario Line lower don bridges

Aerial view of the future Lower Don Bridge and the Don Yard, looking west. Artist renderings subject to change.

The is a brand-new subway line being built in Toronto and is one of the ways Metrolinx is improving and building transit to reduce congestion across the region. The subway is expected see nearly 400,000 daily boardings and will reduce major crowding at the existing Union and Bloor-Yonge subway stations by up to 14 and 22 per cent, respectively. 

For accredited journalists, you can contact our media team at mediarelations@metrolinx.com.  

For customers, please visit Metrolinx – Contact Us to contact the customer service team.