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The Mackenzie River bridges are part of the TransCanada Highway realignment near Thunder Bay, ON, Canada. The project consists of twin two-lane bridges, each with three spans, for a total length of 180 m (590 ft). The bridges cross a deep gorge of the Mackenzie River using variable depth, continuous steel plate girders with full-depth precast concrete deck panels that are lightly prestressed and extend the full width of the bridge. Precast concrete approach slabs and 130 precast concrete deck panels (2.99 m [9.6 ft] wide × 14.5 m [47.6 ft] long × 225 mm [9 in.] thick) were connected at transverse joints and attached to the steel girders through shear pockets and haunches using a total of 175 m3 (229 yd3) field-cast ultra-high-performance concrete (UHPC). [ABSTRACT FROM AUTHOR]