The Montreal-based company (TSX:WSP) will be the lead designer for the KPH-Turcot consortium led by Kiewit Construction. WSP's participation is expected to generate about $100 million in revenues over two to three years.
Other participants are Parsons and Holcim Canada.
Construction of the key highway connecting western, southern and downtown routes is expected to begin next spring and be completed in 2020.
The winning bidders beat two other groups which included SNC-Lavalin (TSX:SNC), Aecon Group (TSX:ARE) and Dessau.
Analyst Sara O'Brien of RBC Capital Markets said the contract shows a pickup of work in Quebec, which has been slow in recent years.