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City of Ottawa prepares for cross-town tunnelling

City of Ottawa prepares for cross-town tunnelling

The Dragados–Tomlinson joint venture (JV) has begun to assemble the tunnel boring machine (TBM) that will be used to deliver the City of Ottawa’s CA$232.3 million (US$181.9 million) Combined Sewage Storage Tunnel (CSST).

The CSST, the City of Ottawa’s second largest infrastructure project, is part of the Ottawa River Action Plan, which aims reduce the impact of combined sewage overflows and stormwater, as well as developing a long-term strategy to protect the river.


A 23 m access shaft has been constructed, and the 4 m diameter, 250 m long TBM is being assembled by the DragadosTomlinson JV.

The CSST will comprise two interconnected tunnels – the North-South Tunnel and the East-West Tunnel – running for 6.2 km, at a depth of 10-31 m, with the capacity to store 43,000 m3 combined sewage to be sent to a sewage treatment plant.

“High-quality water and wastewater infrastructure is an essential part of building liveable communities,” said Minister of Infrastructure and Member of Provincial Parliament for Ottawa West – Nepean Bob Chiarelli.

“The CSST project is of critical importance to our community, as it will help protect and preserve, in the shadow of the Peace Tower, one of Canada’s great watercourses, the Ottawa River.”

Construction began in 2016; it is anticipated that the CSST will be in operation in 2020.

For more information visit the City of Ottawa website.

If you have a project you would like featured in Trenchless International contact Editor Nick Lovering at nlovering@gs-press.com.au


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