Burgoyne Bridge


The replacement Burgoyne Bridge comprised seven continuous spans with a total length of 333 m including a 125 m signature arch that carries the bridge over Twelve Mile Creek and Highway 406 in St. Catharines, Ontario. The new bridge replaces the existing 100-year-old steel box truss / concrete deck structure located on the same footprint as the west deck of the new structure.

Project requirements required that two lanes of traffic were required to remain open during all phases of construction. Difficult geotechnical conditions on the Burgoyne Bridge site demanded lightweight approach fills and strict construction phasing and design to maintain stability of the slopes during construction. The principals of HGC worked with HEC to develop an alternate design for the south approach using cellular concrete. The cellular concrete had a unit weight of about ¼ of that of traditional soil fill. This alternate approach reduced costs, improved schedule, and minimized the risk associated with the requirement for multiple trades to complete the work.

Harbourside also worked to develop alternate cost-effective permanent retaining walls along both the north and south approaches. During construction, Harbourside worked collaboratively to assess the stability of the south slope and the bearing resistance during crane lifts required for demolition of the existing bridge and construction of the new bridge. Most recently HGC has worked with HEC to complete a crane transit analysis of a 180 t crawler crane over cellular concrete at the north abutment.  Settlement analyses were carried out in order to predict the behavior of the cellular concrete slab constructed on expanded polystyrene (EPS) overlying native soils.

This project represents a signature project for the Regional Municipality of Niagara. Harbourside’s work on this project helped reduce the cost and maintain the schedule of the original project in spite of budget concerns related to other aspects of the project. Construction of the new Burgoyne Bridge started in early 2014 and is anticipated to be completed by the end of 2016.

Client: Pomerleau/Structal

Year: 2013-Present

Role: Geotechnical Engineers