CPR Trestle Bridge, Railway trestle bridge in Parry Sound, Canada

The Parry Sound CPR Trestle is a single-track railway viaduct over the Seguin River valley and the streets Gibson, James and Great North Road in Parry Sound, Ontario. Its 517-metre deck runs about 37 metres above the town's lowest point on 26 spans: 22 steel plate girders and four steel truss spans, the two 50-metre trusses over the river resting on concrete piers up to 27 metres high, with ten steel lattice masts carrying the approach girders.

The Canadian Pacific Railway began surveys in 1902 and construction in March 1904 for a 360 km line from Toronto to Sudbury along the Georgian Bay shore, keeping gradients to 3 per mille. The single-track link opened on 15 June 1908, replacing the detour through eastern Ontario and shortening the route by 74 km. Tom Thomson painted the bridge in July 1914.

Tom Thomson, who later inspired the Group of Seven, visited Parry Sound in July 1914 and painted the trestle together with the former Parry Sound Lumber Company. The bridge crosses the Seguin River just upstream of its mouth at Parry Sound on Georgian Bay, and also passes over Great North Road, Bay and Gibson streets.

The trestle crosses the Seguin River just upstream of its mouth at Parry Sound, and also passes over Great North Road, Bay and Gibson streets in town. The rail deck runs about 37 metres above the lowest point of the city, so the structure is seen from below rather than walked on.

The bridge carries 26 spans: 22 are steel plate girders and the four longest are steel trusses. Two 50-metre trusses with the track on top cross the Seguin River mouth on concrete piers up to 27 metres high. Tom Thomson painted the bridge and the former Parry Sound Lumber Company here in July 1914.