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.

What is the CSST?

The CSST is one of the most important projects of the Ottawa River Action Plan.
What: The project will involve the construction of an East-West Tunnel through the downtown core from LeBreton Flats to New Edinburgh Park, and a North-South Tunnel along Kent Street from Chamberlain Avenue to the Ottawa River.
Where: Construction will take place at nine sites across the downtown. 
When: Construction will be phased between summer 2016 and late 2019, with the CSST beginning operations in 2020.  
Why: The CSST will greatly reduce the frequency of sewage overflows during rain storms from entering the Ottawa River by holding up to 43,000m3 of water until it can be treated. This will enhance the health and recreational enjoyment of the river.
Information sessions will be held in advance of construction at the CSST sites, so please look for flyers and follow the newsletter and the project website for dates and times.
Map outlining the North-South and East-West tunnels numbered by surface construction site.

Construction is Beginning at Site 10 (Kent/Chamberlain)

Preliminary construction activities will begin in the next couple of weeks at Site 10 (intersection of Kent Street and Chamberlain Avenue) on land formerly used for the Kent Street Rapid Bridge Replacement project. The contractor will install fencing and will bring trailers, equipment, and crews to begin preparing the site. The contractor will also use the former school board land on Chamberlain Avenue near Bronson for materials and storage.
Birds eye view of site 10 located in the green space at Kent St. and Chamberlaine Ave. A red dot indicates the construction site locations.
Signage will also be installed to direct pedestrians as required.
Traffic lanes on Kent Street, Chamberlain Avenue, and Bank Street will not be closed but will be impacted by short duration lane reductions as materials and equipment enters and exits the site.
A shaft will be constructed at this site to launch the tunneling operation for the North-South Tunnel to the Ottawa River. This site will be in use until late 2018, and a permanent tunnel access point will remain at this location.
Thank you to the neighbours who joined us for an information session about Site 10 on June 27. Please contact the project team at to receive the boards and information presented at the information session.

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

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