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Edmonton’s New Walterdale Bridge

Abstract Replacing an existing century-old truss bridge in the North Saskatchewan River Valley, the new Walterdale Bridge is a signature structure located in Edmonton, Alberta, Canada. The new bridge is a twin through-arch steel structure, spanning 206 m from bank to bank. It carries three lanes of northbound traffic, a sidewalk and a separate shared-use path for pedestrians and cyclists. The steel arch ribs are founded on thrust blocks that resist axial forces and moments by the interaction of inclined footings and micropile anchors with the surrounding bedrock. Construction of the ribs proceeded in stages by supporting the end sections from towers on berms, transporting the assembled central sections on the river by floating them on barges, lifting the ribs into their final position and connecting them to the previously erected end sections. The deck and shared-use path were stick-built starting from each abutment and moving towards the mid-span by sequentially supporting new sections from previously erected members.