View of the Ottawa River from Ontario, looking over the Portage Bridge.

Project Update

Combined Sewage Storage Tunnel (CSST)

The Combined Sewage Storage Tunnel (CSST) project will help protect the Ottawa River for future generations. Read on to find out how construction is progressing.

In the news!

The Tunnel Boring Machine (TBM) has arrived!  
The first piece of the TBM arrived at the CSST staging site located on the old school board property at Bronson and Chamberlain on April 11, 2017.  All components are being stored until the lengthy process of assembly begins, much of which will be underground.  This is required before the tunneling work begins.
Stay tuned!
Tunnel Boring Machine components being delivered
TBM Component delivery to the site
Tunnel Boring Machine components
Tunnel Boring Machine components

Construction Forecast - Sites on your radar

The map below identifies construction sites for the CSST project within the City of Ottawa. Construction has either started or activities are imminent at the sites indicated in green. The red dots indicate future construction sites. Site 7, identified with the grey dot, was eliminated during the design phase of the project.
Tunneling activities for the North-South Tunnel are anticipated to start at Site 10 by mid 2017. 
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
Read on for information regarding planned activity and the project sites that are currently active.

Site 5: East West Tunnel Outlet/Rideau River Collector Diversion – Stanley Park/New Edinburgh Park

Construction activity continues in New Edinburgh, in Stanley Park and at River Lane/Queen Victoria.
Construction activities include: 
  • The construction site in Stanley Park is being prepared with stone laid on top of geotextile material
  • Temporary pedestrian and bicycle pathways have been built around the construction site in Stanley Park
  • Relocation of existing sewers, including installation of temporary manholes
  • Sediment and erosion protection is being maintained
Stone being spread on top of geotextile barrier in Stanley Park
Stone being spread on top of geotextile barrier in Stanley Park
  Workers finish a new paved pathway in Stanley Park

Workers finish a new paved pathway in Stanley Park

As the construction site in the park develops, the contractor continues to use the requisite interim truck route in and out of the park, wherever possible.  There are load weight restrictions currently in place on many roads within the City. This means trucks may not always be able to adhere to interim truck route during this time.  Trucks may also need to travel within New Edinburgh between Stanley Park and River Lane/Queen Victoria.

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

This site will be the exit point for the TBM traveling northward from Site 10 (Kent and Chamberlain). It will also be a permanent access point to the CSST once complete.
Construction activities at this site, are anticipated to begin in June 2017.

Site 8: McLeod Street Drop - Kent and McLeod Streets

Upcoming Community Information Session

A Community Information Session with the project team, is scheduled for May 24th (drop-in - 5 pm to 8 pm) at McNabb Community Centre (180 Percy Street). At this session, residents will have the opportunity to:
  • Review background information on the CSST Project
  • Review construction activities and impacts in the neighbourhood
  • Provide feedback on the project and aspects for consideration

Additional information on the session and upcoming construction can also be accessed at  

Site 10: Chamberlain Shaft – Kent and Chamberlain Street

This site will be the access point for the TBM; a shaft is being constructed to launch the tunnelling operation for the North-South Tunnel to the Ottawa River.
Construction activities continue:
  • Excavation of the access shaft was completed. Mining of the tail tunnel for the TBM to begin shortly and will extend under Chamberlain Street
  • A temporary hydro service installation for the TBM was completed
  • The TBM components have arrived and are being stored

View inside the access shaft
View inside the access shaft

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 now has a dedicated phone line to field questions and comments from community members and  stakeholders. During regular business hours, the CSST phone line will be monitored by the CSST field ambassadors and project team members.
The phone number is 613-580-2424 ext 2CSST (22778) and does not replace 3-1-1.
If your matter requires urgent attention, please report your concern by calling 3-1-1. Voice messages will be returned the next business day.
Visit us on the web at or email the project team at Note that the website is continuously updated with information on Open Houses, Public Information Sessions, and materials distributed at these events. Please continue to visit for updated information.

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