NORTH AMERICA | PROJECTS


The change followed the project having had to be


paused in late 2024, following the historic drought that Fall, ending the existing construction contract and forcing the final connection to the bypass to be completed under a new procurement process. Those challenges, plus plans to upgraded pumps, mean the final connection for the bypass is not due for completion until after 2027. The final bypass connection requires an eight-month


shutdown and draining of the aqueduct, starting in October of any given year as demand is lower in Winter.


US: NH SEWER TUNNEL JOB BY TBM The City of Manchester, NH, aims to transform its drainage system in such ways as to reduce combined sewer overflows and also improve the water quality of the Merrimack River which is a critical natural resource, supplying drinking water for 600,000 residents. Key infrastructure in the drainage improvement


include the construction of a new, 2.25 mile-long sewer - the Cemetery Brook Drain Tunnel. The overall project is budgeted at US$360 million and


is being undertaken by the US Environmental Protection Agency and the NH’s Department of Environmental Services. The contract to construct the Cemetery Brook Drain


Tunnel was recently awarded to Methuen Obayashi Joint Venture and is to be completed in 2028. Tunnelling is to be performed by TBM boring with the


sewer tunnel alignment running about 26 yds below the ground surface. The sewer is to be a 12ft-i.d. tunnel. Construction is the start on the banks of the


Merrimack River. Seven drop shafts and corresponding structures are to be built. The shafts will be excavated in in rock either by mechanised excavation or controlled blasting. The shafts will provide construction access, and DS-7


shaft will be used to retrieve the TBM. During its operational life the shafts will convey flows into the drainage tunnel.


US: ENERGY PIPELINE BOOST WITH TUNNEL In January, the US declared a national energy emergency to help accelerate expansion of US energy production. One project is Enbridge’s proposed tunnel to carry for the Line 5 oil and gas pipeline, in the Great Lakes area. The oil and gas pipeline tunnel is to be located in


the Straits of Mackinac. Recently, the US Army Corps of Engineers (USACE) granted national energy emergency status for planned 3.6 mile-long tunnel to help fast- track the environmental review process. The project is among the first to receive such


emergency designation. In 2023, Michigan regulators approved Enbridge’s


application to build the US$750 million tunnel but USACE assessment and permission were still needed. The project has been opposed by environmentalists and Native American tribes. Enbridge has already appointed a JV of Barnard Construction and Civil and Building North America.


CANADA: EGLINTON CROSSTOWN WEST EXTENSION Over the next decade Ontario is investing nearly Can$70 billion (US$51.3 billion) in public transit, which includes the largest subway expansion in Canadian history, covering the Ontario Line, the Scarborough Subway Extension, the Eglinton Crosstown West Extension, and the Yonge North Subway Extension. Toronto’s 5.6 mile (9km)-long Eglinton Crosstown


West Extension will connect seven new stations to the Eglinton Crosstown LRT, making travel faster and more convenient, while bringing more than 37,500 people within a 10-minute walk of transit facilities. Works on Eglinton Crosstown West Extension


have been underway for the last few years and are at advanced stages at different points. Recently, Government of Ontario broke ground on the


final tunnel segment of the project. This section involved construction of 547 yds (500m)-long twin tunnels on the line’s eastern section. The tunnels will run just east of Jane Street to Mount Dennis Station, where the extension will connect to the future Eglinton Crosstown LRT service. Tunnelling is to be performed using the sequential


excavation method (SEM) and progress of 1m-2m per day is anticipated to be achieved. Elsewhere on the project, WestEnd Connectors


achieves substantial completion of the scope of its works, marking the successful completion of two 3.9 mile (6.3km)-long tunnels, nine cross-passages, 12 headwalls for four underground stations and two emergency exit buildings, construction of the launch shaft and Light Rail Transit portal. WestEnd Connectors, consisting of Dragados Canada


Inc, Aecon Infrastructure Management Inc, and Ghella Canada Ltd, says all the structures were completed with over 1.9 million hours worked without a lost time injury. TBMs ‘Rexy’ and ‘Renny’ spent two years excavating


the twin tunnels, completing their drives on the western section last year.


Above: Works at advanced stage on Eglinton Crosstown West Extension November 2025 | 21


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