This enabling works contract for the new 15.6 km Ontario Line subway was awarded to KO Constructors, a Kenaidan and Obayashi joint venture. This work focuses on transitioning the trains from the tunnel to the bridge in downtown Toronto’s Lower Don Lands neighbourhood.

The project includes two major scopes of work: a portal tunnel structure and a steel arch bridge. The construction of the portal tunnel involves a 300 m cut-and-cover tunnel box structure and a 250 m u-wall portal structure.

The bridge portion involves a 120 m clear-span steel arch bridge to carry the two Ontario Line tracks over the Don Valley Parkway (DVP) and Don River.

Other work includes relocating and protecting utilities and signal infrastructure, constructing a new emergency services building, noise barrier walls, a tunnel termination block, and installation of a new monopole structure to facilitate the relocation of overhead high-voltage power lines.