KIM BURTON-SCHRAM
Local journalism initiative reporter
Clearwater Structures Inc. of Bowmanville has been chosen to overhaul the Cass Bridge in North Dundas for $3,577,018, the lowest of seven bids submitted on the job to the United Counties of Stormont-Dundas-Glengarry.
The cost is lower than the $4.1 million amount budgeted in 2026 for the rehabilitation project. Work is planned to begin in May 2026 and will take two construction seasons to complete. During construction, the bridge will be reduced to one lane only, with the possibility of complete closures for 24 hours. However, during the winter months, the Cass Bridge will be open for two-way traffic.
Other bids were: KB Civil Constructors Inc. $3,747,689; UrbanLink Civil Ltd. $3,757,000; Orin Contractors $3,938,621; GIP Paving Inc. $4,245,558; Louis W. Bray Construction Limited $4,406,350 and R.W. Tomlinson Limited $5,233,453.
The bridge in North Dundas spans the South Nation River and serves as a vital transport link for close to 5,000 travellers between North and South Dundas. Built in 1971, the bidge underwent an Ontario Structure Inspection in 2023 which identified minor rehabilitation work to manage the leaking expansion joints and girder ends.
However, a 2025 planning inspection by Stantec Consulting revealed elevated chloride levels which could lead to corrosion in the prestressed concrete girders. These girders are stretched, high-strength steel strands that have been cast in concrete. Prestressed concrete girders permit longer spans and are highly durable, however, they can be affected by corrosion, causing delamination of the concrete where the thin, top layer of concrete separates from the main slab.
The work will include replacement of the deck, girder strengthening, replacement of the barrier wall and semi-integral expansion joint conversion which eliminates deck expansion joints where snow and ice road maintenance may be causing corrosion issues.
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