The Lethbridge Viaduct, commonly known as the High Level Bridge, was constructed between 1907 and 1909 at Lethbridge, Alberta, Canada.

This massive steel trestle over the Oldman River was designed by the Canadian Pacific Railway's bridge department in Montreal, Quebec. The field work was directed by CPR's Assistant Chief Engineer John Edward Schwitzer. The steel work was manufactured by the Canadian Bridge Company of Walkerville, Ontario. A 100-man gang worked on the erection of the steel. Although there were some initial problems with settlement, the bridge has proved to be an enduring engineering work and is still in use today.

This bridge is the largest railway structure in Canada and the largest of its type in the world. It was built as part of a major diversion of the Crowsnest Pass route between Lethbridge and Fort Macleod. The river crossing was previously over a wooden trestle measuring 894 m long and 20 m high; an impressive structure in its own right.

Specifications

• Length: 1,623.860 m
• Height: 96 m above river bed
• Materials: 11,200 tons of steel
• Rigid braced steel towers: total of 33

According to Wikipedia