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Project Update - Combined Sewage Storage Tunnel (CSST) - February 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.

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) lines as it mines – watch it here. Watch as excavated material is carried out, pre-cast tunnel liners are carried in, and the (TBM) moves each segment into place.
Tunnel boring machine (TBM), showing cutter head mining pattern on rock
Tunnel boring machine (TBM), showing cutter head mining pattern on rock. 
 

Site 10: Chamberlain Shaft (Kent/Chamberlain Streets)

Site 10 is the 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 first two rings of the NST, looking towards the tunnel boring machine (TBM) as it works
View inside the first two rings of the NST, looking towards the tunnel boring machine (TBM) as it works.  
View of above ground operations to support tunneling at site 10a
View of above ground operations to support tunneling at site 10a.       

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 for water control is complete.
  • Installation of new Kent Street outfall chamber is well underway.
  • Exit portal face for tunnel boring machine has been excavated.
Exposed face of the exit portal, where the tunnel boring machine (TBM) will arrive, behind the Supreme Court of Canada.
Exposed face of the exit portal, where the tunnel boring machine (TBM) will arrive, behind the Supreme Court of Canada.     
View of site 6, looking towards Parliament Hill
View of site 6, looking towards Parliament Hill.  

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 excavating the tail and starter tunnels at the bottom of 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), excavation is underway.
  • Monitoring of vibration and noise levels continues.
Drilling a bore hole marks the commencement of tail tunnel excavation in the 5A shaft
Drilling a bore hole marks the commencement of tail tunnel excavation in the 5A shaft.
Shoring work, used to support excavation at 5C
Shoring work, used to support excavation at 5C.

Site 1: West End Shaft – LeBreton Flats

Site 1 will be the exit point for the TBM and the western end of the East-West Tunnel. It is expected that The TBM will emerge here in the summer of 2019.

Site 1 construction activities of interest:
  • Excavation of the exit shaft 
  • Preparation for pipe installation.
Excavation to expose existing infrastructure and prepare exit shaft at site 1.

Excavation to expose existing infrastructure and prepare exit shaft at site 1.

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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