In summer 2020, the City of Toronto will rehabilitate a section of a 112 year-old Cross Harbour Tunnel located below Lake Ontario from Muggs Island to the John Street Pumping Station (JSPS).

This project will take about 10 months to complete. The tunnel is a large pipe that carries cold water from the Island Water Treatment Plant to the JSPS and supplies water to Enwave for deep lake water cooling.

This project is part of the Council-approved 2020 Capital Works Program to renew aging water infrastructure, improve water distribution and will bring this tunnel to a good state of repair.

Hoarding Artwork along the fencing with the CN tower, construction crane and Rogers Centre in the background
Hoarding Artwork
Aerial View of the artwork and fencing, for more information please contact
Aerial View
Works Area Map shows the tunnel starting at the Rees St. parking lot and extending out through the lake to Muggs Island.
Works Area Map

The City will rehabilitate approximately 800 m of the 1.5 km Cross Harbour Tunnel (tunnel); a large pipe that carries cold water from the Island Water Treatment Plant to the city and is also used by Enwave for deep lake water cooling.

The work is the result of a 2018 Camera inspection that showed parts of the tunnel have major structural cracks or are deformed due to bed rock squeezing.

Most of the tunnel rehabilitation will be conducted via a deep shaft that will create an access point for steel pipes to be lowered and pushed inside the tunnel, and then welded together to form a new pipe inside the existing tunnel.


Construction will take place between September 2020 and June 2021, following the steps described below:

  • Shaft construction: September 2020 to December 2020
  • Tunnel rehabilitation: December 2020 to March 2021
  • Restoration: May 2021 to June 2021

Following rehabilitation of the Tunnel, the site will be used to construct a new large shaft for the Central Waterfront Wet Weather Flow System, followed by conversion to a park.


Construction is taking place in the parking lot at the north-west corner of Queens Quay and Rees Street, and parking will remain available at 60 per cent capacity. All parking will be reinstated after construction, and the surface will be restored with a hatch/cover allowing cars to be parked on top.

Construction Activity

Work above ground will take place from 7 a.m. to 7 p.m., Monday to Friday, with work after hours and on weekends as required. No truck deliveries will take place after 7 p.m.

  • Construction vehicles will enter/exit the site from Lake Shore Boulevard West (eastbound), Queens Quay access will be maintained for parking lot
  • All pipe pieces, tools and crews will enter inside the tunnel from the shaft
  • Construction hoarding will be installed around the shaft site
  • Vehicle beepers will be removed and replaced with white noise technology
  • Any overnight works will be restricted to below ground to minimize noise


  • Project updates are being sent via Canada Post direct mail to adjacent residents and businesses.
  • Email updates are shared through a detailed stakeholder list, and stakeholders are asked to share information with their networks.
  • Signage will also be installed around the construction site to notify local residents about the project.
  • The City will convene stakeholders as required to discuss concerns, and additional information will be shared via a project email list.

Pre constuction notice crossharbour tunnel July 2020

What to Expect During Construction

Work Hours

Work above ground will take place from 7 a.m. to 7 p.m. Monday to Friday, with work after hours and on weekends as required.

Pre-Construction Inspection

The Contractor will survey all properties within 30 metres of the construction area before construction starts. Participation in the survey is voluntary; however, participating is important to determine if construction caused damage. The inspection will look at the exterior of all properties to verify existing conditions. The company will deliver a separate notice requesting time to set up appointments. All inspection staff will be wearing photo identification and carrying photographic equipment during their work.

Road and Sidewalk Access

In order to complete the work in a safe manner, there will be road and sidewalk restrictions on Lake Shore Boulevard north of the Rees Street parking lot. Sidewalks will remain open on the north side of Lake Shore Boulevard between Lower Spadina and Rees Street.

Traffic Management

Efforts have been made to manage traffic in the area for the safety of workers, road users and residents. Road users should expect a short delay on Lake Shore Blvd during deliveries in and out of the parking lot.

Parking: The Rees Street Parking Lot capacity will be reduced to 60 per cent due to the shaft construction and materials storage.

The west part of the parking lot will be fenced and hoarded for safety. Access to the Parking Lot for customers will be maintained from Queens Quay West. The contractor will access the worksite in the parking lot via Lake Shore Boulevard West.


The construction work area will be restored with sod and asphalt where required.