Peace Bridge

Project Description

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The Peace Bridge spanning the Bow River in Calgary has become a favorite with photographers since it opened in May 2012. Designed by world-renowned architect Santiago Calatrava, the stunning structure is a pedestrian/cyclist bridge that connects the vibrant neighbourhoods of Sunnyside and Hillhurst to the city’s downtown core.

The bridge structure is a sleek helix-shaped steel truss system developed over a semi-elliptical cross-section in a single span of 126 metres. The deck is eight metres wide to accommodate pedestrian lanes on either side and a central bike lane separated by curbs.

The location of the bridge presented a design challenge that made structural steel the ideal solution. The Bow River at that point is about 120 metres wide and six metres deep. For environmental and safety reasons, an in-stream support pier was not an option. This meant the bridge would need to comprise a single 126-metre-long span. The site is also beneath the flight path of Calgary’s downtown heliport. Flight path restrictions, in combination with limitations due to the Bow River’s 100-year flood levels, squeezed the allowed structural depth of the bridge to a maximum of only 5.85 metres. Due to the challenging design criteria of a long span, wide bridge deck, and low structural depth, structural steel was chosen for its high strength-to-weight ratio.

The Peace Bridge has become an instant icon of the city and has vitalized the surrounding neighbourhoods. It is crossed by about 6,000 people daily, including a growing number of people using alternative modes of transportation to their workplaces as well as recreational users. The bridge is a popular spot for photo shoots and has become one of the prime meeting points in Calgary.