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Project Update - Combined Sewage Storage Tunnel (CSST) - January 2018

Ottawa River

Building a healthy and resilient future for the Ottawa River

This $232.3 million construction project is a key part of the Ottawa River Action Plan (ORAP), which is aimed at enhancing the health of the Ottawa River and protecting our water environment for future generations. A healthy water environment provides safe, abundant drinking water; supports agriculture, recreation and tourism; lessens the impact of flood events; and helps sustain fish and wildlife.

The tunnel boring machine lines as it mines - Watch it here!

Wondering what it’s like to work in the tunnel?  It’s tight down there – but our camera captured the work currently underway.  Watch as excavated material is carried out, pre-cast tunnel liners are carried in, and the tunnel boring machine (TBM) moves each segment into place!

Construction Site Map

The map below identifies construction sites for the CSST project within the City of Ottawa, which are described in more detail here.
Map of the CSST sites numbers 1 to 10. Sites 5, 6 and 10 are green, site 7 is grey and all other sites are red
The CSST will consist of two inter-connected tunnels over six kilometres in total length, three metres in diameter, located 10 to 31 metres below surface level. The North-South Tunnel will run below Kent Street, from Chamberlain Avenue to just behind the Supreme Court of Canada, and the East-West Tunnel will run through the downtown core, from Stanley Park to LeBreton Flats, generally under Cumberland and Slater Streets.

Construction has already started at several sites. 

Construction Activity Progress

North South Tunnel (NST)

Tunneling of the North-South Tunnel (NST) from Kent/Chamberlain Streets to the Ottawa River (Site 10 to Site 6) is underway. At the other end of the NST, work is underway on the exit portal near the Ottawa River, where in the spring of 2018, the machine will complete its 2-kilometre journey under the city, exiting behind the Supreme Court of Canada.
 
The tunnel boring machine (TBM) has been specifically designed to cut through solid rock at the pace of roughly 20 to 25 meters per day. Progress in the first several weeks is much slower, however, as the TBM grows from 90 metres to its full 250-metre length. Tunneling is accelerating; stay tuned for distance updates!
Tunnel Boring Machine (TBM)
Tunnel boring machine (TBM), showing cutter head wheels (yellow) in the factory. 
 

Site 10: Chamberlain Shaft (Kent/Chamberlain Streets)

Site 10 is the (TBM) launch shaft for the north-south tunneling operation.

Site 10 construction activities of interest:
  • Geotechnical monitoring continues.
  • Surface works to support tunneling operations: removal of excavated material and insertion of precast concrete liners by gantry crane.
  • Excavated material is stockpiled and trucked off-site during daytime hours.
View inside the NST, looking towards the tunnel boring machine (TBM) as it works.
View inside the NST, looking towards the tunnel boring machine (TBM) as it works.  
View of completed portion of the NST, looking south towards the access shaft.
View of completed portion of the NST, looking south towards the access shaft.     

Site 6: North South Tunnel Overflow/Kent Street Outfall - Ottawa River Pathway

Site 6 will be the exit point for the TBM and the northern end of the North-South Tunnel. It is expected that the TBM will emerge here, along the Ottawa River behind the Supreme Court of Canada, in the spring of 2018.

Site 6 construction activities of interest:
  • Geotechnical monitoring continues.
  • Construction of berm, used for water control, complete.
  • Preparation for installation of new Kent Street outfall chamber is well underway.
  • Exit portal face for tunnel boring machine has been excavated.
Excavation of earth and rock in order to expose exit portal face behind the Supreme Court of Canada.
Excavation of earth and rock in order to expose exit portal face behind the Supreme Court of Canada.     
Excavation of the Kent Street Outfall.
Excavation of the Kent Street Outfall.  

Site 5: East-West Tunnel Outlet and Rideau River Collector Diversion (New Edinburgh)

Construction continues in New Edinburgh's Stanley Park, where the TBM will start its East-West journey later in 2018, and has re-commenced at the intersection of Queen Victoria Street and River Lane (to connect to existing overflow sewer infrastructure).

Site 5 construction activities of interest:
  • Shaft 5A excavation is complete; crews are preparing to begin excavating the tail and starter tunnels at the bottom of this shaft (within which the TBM will later be assembled).
  • Excavation of the Interceptor Outfall Sewer (IOS) is ongoing.
  • Exterior finishing of the new Odour Control Facility is complete, with the exception of lighting, and interior works continue.
  • At 5C (the intersection of Queen Victoria and River), shoring work – a means of supporting the shaft – and excavation of earth has commenced.
  • Monitoring of vibration and noise levels continues.
Rock breaking within the shaft at 5A.
Rock breaking within the shaft at 5A. 
Line drilling at 5C – part of the shoring work in preparation for excavation.
Line drilling at 5C – part of the shoring work in preparation for excavation.

Mobility & You

Stay informed about capital infrastructure projects. Check out the City’s interactive traffic map and traffic report or call 3-1-1 for updates about when and where construction is happening.

Contact Us

The CSST Project Team is committed to sharing information that may help affected residents and businesses plan around construction in their neighbourhoods.

For more information:

The CSST dedicated phone number is 613-580-2424 ext 2CSST (22778).  (This does not replace 3-1-1).
  
Visit us on the web at Ottawa.ca/CSST or email the project team at CSST@ottawa.ca
Banner with ORAP logo and City of Ottawa logo with wording that sayd, Supporting an environmentally sustainable Ottawa. www.ottawa.ca/CSST
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