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St. Andrews Lock and Dam Bridge Deck Replacement


Lockport, Manitoba




Bridge Rehabilitation & Retrofit



A thorough inspection report in 2017 concluded that the main span of the St. Andrew’s Lock and Dam bridge deck had to be replaced. In late 2019, Associated Engineering was retained by Public Services and Procurement Canada to work on the project.

Associated Engineering undertook the comprehensive detailed inspections in 2019 to inform the rehabilitation and strengthening design. The objective of the rehabilitation was to remove the load posting on the bridge, which was posted at 36 tonnes, complete the deck rehabilitation on both approach structures, complete new deck and stringers on the main truss spans (spans 1 through 7), widening of existing deck to the north, and replace expansion bearings on pier 1.

Detailed analysis was undertaken in order to fully understand the nature of the existing structure, taking into account material properties from a hundred years ago, and how it is configured. This understanding was key to developing an appropriate design response to rehabilitate, strengthen, and widen the structure. The detailed analysis included a structural evaluation taking into account reductions in structural capacity of existing deteriorated members. The structural evaluation was completed to determine deficient members that would need upgrading for the anticipated load demands and widening.

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Public Services and Procurement Canada




National Historic Site of Canada

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Project Highlights


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Construction value

During construction, the St. Andrew’s Lock and Dam had to remain open to support the local economy; while protecting endangered bird species and limiting further ground disturbance to preserve the area around the facility that is rich in archeological history.

This was a multi-year undertaking beginning in 2019 and culminated with the bridge re-opening in July 2023. A Ribbon Cutting Ceremony was held on July 17, 2023, video here.

The operating life of the bridge has been extended by 50 years. The project showcases effective ways to design and manage the preservation and improvement of protected, designated historical structures.

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A career step in the right direction

We are recognized as one of Canada’s Best Managed Companies for 14 consecutive years but our achievements and reputation are only possible because of our amazing staff. We believe that a supported staff allows them to excel at what they do best, and provide the best possible service to our clients and communities.