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Second Narrows Water Supply Tunnel

Vancouver, British Columbia

Ensuring reliable delivery of drinking water for Metro Vancouver, the project includes construction of seismic standard shafts, one on each side of Burrard Inlet, connected by a 1,100-metre tunnel. The north entry shaft will be in North Vancouver and approximately 60 metres deep, while the south exit shaft will be in Burnaby and approximately 110 metres deep. A joint venture between Aecon (40%) and Traylor Bros Inc. (60%) is delivering the project.



Metro Vancouver (Greater Vancouver Water District)

$267 million


The new water supply tunnel will be excavated deep underground using a tunnel boring machine. The tunnel boring machine will launch from a vertical entry shaft on the North Vancouver side and progress south under Burrard Inlet to the vertical exit shaft on the Burnaby side. Once the tunnel is excavated, three steel water mains will be installed inside the new tunnel and connected to the new valve chambers at each shaft site, and into the region’s drinking water system. When complete, the tunnel will also increase the capacity of the existing system to meet the long-term needs of the growing population.

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