On or about May 20th, 2025, a portion of the Don River near E.T. Seton Park will be closed to paddlers and other river users as Metrolinx begins in-water work for the Ontario Line’s West Don Crossing bridge that will carry the Ontario Line across the valley, over the E.T. Seton Park area, connecting the Thorncliffe Park and Flemingdon Park guideways and stations.
This phase — expected to last until September 2027 — will involve stabilizing riverbanks, installing a temporary cofferdam, and other erosion control measures to support the bridge structure. The river closure is significant for paddlers, kayakers, and canoeists who use this stretch of the Don. To safely bypass the work zone, Metrolinx will install a portage route—requiring river users to carry their vessels around the closure.
According to Metrolinx’s construction notice, crews will be using heavy equipment to place riprap and meter bags in the riverbed, with care taken to minimize vegetation loss and restore the area with native plantings after work concludes.
Read full Metrolinx Construction Notice: Click here
BlogTO: Stretch of Toronto river to be closed off to public for over 2 years