Enwave Deep Lake Cooling Lake Shore Bypass – Toronto, ON

Project Outline

In total, 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, but also some HDPE and other sizes.

The Lake Shore Bypass project consisted of 1442m of 1200mm main installed primarily under Lake Shore Boulevard and the Gardiner Expressway. Multiple crews were utilized throughout construction. 85% of the job completed with own forces, the remainder was with various subcontractors. Construction started in January 2012 and was completed in January 2016.


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

The job had a single main construction shaft. It was 11m ID Caisson Wall to Soil / Rock interface and 34m deep.

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