Enwave Deep Lake Cooling Lake Distribution Tunnels – Toronto, ON

Project Outline

C&M McNally has constructed approximately 5,500m of tunnel in Downtown Toronto in the in the Georgian Shale for the deep lake cooling distribution. Excavated diameters have been 3.0m and 3.6m diameters. Average daily mining production rates of 12m or more were achieved. The system is a closed loop / twin pipe design primarily comprised of 42 (1050mm) and 48” (1200mm) steel liner concrete encased pipe, concrete pressure pipe and HDPE as well as other sizes.


The job was located in Downtown Toronto. Generally, working sites were kept to small portions of public roadways where two way vehicle traffic was maintained at all times.

Shaft Description

There have been dozens of shafts all in urban locations, usually the road allowance. Complex utility relocations are common.

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