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An “elevated” tour of construction on the Ontario Line
From future stations to towering bridges, see the latest progress in the north end.
Jul 2, 2026
Ontario Line construction is picking up speed in the northernmost part of the route.
From new bridges rising above the Don Valley, to station foundations taking shape, to the future home of Ontario Line trains coming to life, there's a lot going on.
Here's a look at the latest Ontario Line construction happening on the ground.
Don Valley Crossing
Left: Aerial drone footage of Don Valley Crossing bridge piers under construction. Right: Artist’s rendering of future Don Valley Crossing in Thorncliffe Park.
One of the Ontario Line's most dramatic structures is beginning to emerge in the Don Valley.
The future Don Valley Crossing is one of two new subway bridges that will carry Ontario Line trains across the Don Valley and the Don River.
The bridge will span over half a kilometre in length and carry Ontario Line trains between the tunnel portal at Minton Place and the elevated guideway in Thorncliffe Park.
Crews have completed key foundations and support structures for the crossing and are now building the massive concrete piers that will support the bridge above the valley.
Aerial drone images of Don Valley Crossing bridge piers under construction in Thorncliffe Park.
Fun fact:
More than 23,000 cubic metres of concrete will be used to build the bridge, enough to fill about nine Olympic-sized swimming pools.
Thorncliffe Park Station
Left: Aerial drone image of construction at Thorncliffe Park Station site. Right: Artist’s renderings of future Thorncliffe Park Station.
Heading north, crews are making steady progress at the future Thorncliffe Park Station.
Teams have completed 27 of the 40 piles needed to support the Ontario Line’s future elevated guideway, a nearly 3-kilometre stretch of raised track that will carry trains above street traffic and connect Thorncliffe Park, Flemingdon Park and Don Valley stations.
On-the-ground images of piling construction at Thorncliffe Park Station.
Crews are now working to build the piers for the elevated guideway, the first visible sign of the structure taking shape above ground in the area.
Fun fact:
The deepest pile at Thorncliffe Park measures 49 metres, which is the length of about four full-sized school buses stacked bumper to bumper.
The future home of Ontario Line trains
Left: Aerial drone image of the OMSF construction site in Thorncliffe Park. Right: Artist’s renderings of OMSF, looking southwest from Wicksteed Avenue.
Just north of Thorncliffe Park Station, construction is ramping up at the Ontario Line’s future operations, maintenance and storage facility (OMSF), the operational nerve centre of the Ontario Line where trains will be cleaned, inspected, repaired and stored for daily service.
Crews have completed excavation of the OMSF's 115-metre-long maintenance pit, where Ontario Line trains will be inspected and repaired from below. Work has also been completed on the OMSF retaining wall that will help stabilize future Ontario Line tracks at the site.
Left: Image of the OMSF maintenance pit excavation. Right: Image of the OMSF retaining wall under construction.
Teams are now turning their attention to the facility's main buildings, including foundational work on the main maintenance building, train wash and traction power substation.
Fun fact:
The OMSF will include a 923-metre-long test track. That's nearly the length of nine soccer pitches lined up end-to-end.
Beth Nealson underpass
Left: Aerial drone image of Beth Nealson underpass construction site in Thorncliffe Park. Right: Artist’s rendering of future Beth Nealson underpass, looking south from Wicksteed Ave.
Just east of the OMSF, work is underway to build the Beth Nealson underpass, which will allow cars, cyclists and pedestrians to travel safely below while Ontario Line trains pass overhead.
The underpass is already taking shape as crews have installed 111 underground concrete foundations that will support the structure from below.
Left: Aerial drone image of Beth Nealson underpass construction site. Right: Artist’s rendering of Beth Nealson underpass, looking southwest from Wicksteed Ave.
Teams are now completing excavation of the road and starting construction on a track retaining wall that will help support the underpass structure.
Fun fact:
The underpass will require about 7,400 cubic metres of concrete. That’s enough concrete to build a 10-storey building.
West Don Crossing
Aerial drone images of West Don Crossing bridge piers over E.T. Seton Park.
Moving east towards E.T. Seton Park, crews are making progress on the West Don Crossing, the second Ontario Line bridge that will carry trains over the Don Valley and connect Thorncliffe Park and Flemingdon Park stations.
Major progress has been made on the five bridge piers that will support the bridge structure, with two piers now complete and two more nearing completion.
Aerial drone images of Ontario Line crews building the West Don Crossing bridge piers.
Next up, teams will begin installing the bridge deck that will carry trains across the valley.
Fun fact:
At 409 metres long, the West Don Crossing will stretch farther than four football fields laid end-to-end.
Flemingdon Park Station
Left: Aerial drone image of construction at Flemingdon Park Station. Right: Artist’s rendering of Flemingdon Park Station, looking northwest from Gateway Blvd.
Moving north towards Flemingdon Park Station, crews are building the foundation that will support the future station and elevated guideway. So far, they have completed construction on 16 guideway piles.
Teams are now building a new access road near the E.T. Seton Park to create space for the future elevated guideway.
Images of guideway piling at Flemingdon Park Station site.
Fun fact:
Crews are installing piles up to 47 metres below the surface, which is nearly the length of two GO train coaches lined up end-to-end.
Don Valley Station
Left: Aerial drone image of construction at Don Valley Station. Right: Artist’s rendering of future Don Valley Station, looking northwest from Eglinton Ave. E.
Moving north along Don Mills Road, construction is also advancing to bring an Ontario Line connection to Don Valley Station.
Crews have completed piling for the future station’s basement and construction of the station's wall. To date, crews have completed 13 guideway piles and 10 guideway piers.
Images of elevated guideway piers under construction at Don Valley Station.
Teams will continue building additional guideway piers above ground as they prepare for elevated guideway construction along Don Mills Road.
Fun fact: Don Valley Station will connect directly with Line 5 Eglinton, making it one of the Ontario Line's key interchange stations.
Looking ahead
Across Toronto's northeast, the Ontario Line is becoming more visible every day as foundations give way to bridges, guideways and station structures. Over the coming months, residents will begin to see even more of the future subway line emerge above ground as construction continues across the area.
For updates on the Ontario Line, follow @OntarioLine, sign up for our newsletter or connect with us in person at a community office.