Two excavators working inside a deep, circular construction pit with wet, muddy ground and rusty walls, with workers near a small tunnel entry.Excavator working at the bottom of a deep circular construction pit with muddy ground.
Aerial view of a construction site with a yellow crane and deep excavation, set against a city skyline with tall buildings and a cloudy sky.Construction site with a large yellow crane, workers, machinery, and a deep circular excavation, with a city skyline in the background under a cloudy sky.
Large body of water separated by a long floating barrier with industrial buildings and piles of coal on the left shore under a clear sky.Tugboat pulling a long line of floating buoys across a large body of water with a distant forested shoreline.
Aerial view of two bridges crossing a waterway with a tugboat passing underneath, surrounded by greenery and urban buildings in the background.A green lift bridge with an orange truss section over a river, with a ship passing underneath and a city skyline in the background.
View looking up from inside a large industrial cylindrical structure with pipes, scaffolding, and a crane visible against a cloudy sky.View looking up from inside a large cylindrical construction shaft with scaffolding, pipes, ladders, and a yellow crane visible against a cloudy sky.

Engineering
breakthroughs.

At McNally, we build innovative underground infrastructure in communities across Canada and the US, helping to deliver green heating and cooling, safe drinking water, swimmable lakes, and more.

  • WATERMAINS
  • |
  • STORMWATER MANAGEMENT
  • WASTEWATER TREATMENT
  • |
  • UTILITY CONDUIT
  • LAKE INTAKE
  • |
  • OUTFALL TUNNELS
  • |
  • + MORE
  • WATERMAINS
  • |
  • OUTFALL TUNNELS
  • WASTEWATER TREATMENT
  • STORMWATER MANAGEMENT
  • LAKE INTAKE
  • |
  • UTILITY CONDUIT
  • + ADDITIONAL SERVICES
Watermains  |  Stormwater management | Wastewater treatment Utility conduit | Lake intake & outfall tunnels + MORE
Ready to discuss
your tunnel project?
Our Services

Infrastructure Tunnelling

Tunnelling is the least intrusive way to build essential infrastructure, supporting transportation, utilities, resilience and sustainable growth beneath the surface. With decades of expertise, McNally is ready to tackle any challenge and help your community grow.

C&M McNally Engineering Corp has over 45 years of tunnelling experience. Located in Burlington Ontario, Canada, we are ideally situated to assist in community growth across North America.

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Our Equipment

Customized
Tools. Designed
to Work

The right equipment makes all the difference. When it doesn’t exist, we engineer and build custom solutions to maximize safety and efficiency.

Tunnel Boring
Machines
McNally Roof
Support System
McNally Air Car
Pipe Installation
Micro
Tunnelling
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Worker in orange safety jacket and welding helmet welding a pipe with sparks and smoke visible.Worker in a high-visibility orange safety suit and welding helmet welding a metal pipe with sparks and smoke.
What makes us special?

WORK WITH US -
EXPECT MORE

Est. 1979
Safety

A project’s greatest success is a safe track record. At McNally we continually strengthen our safety culture, empowering our team to identify hazards and make improvements. Safety also extends beyond our workforce as we carefully monitor and audit how our sites interact with surrounding neighbourhoods to keep them safe and unobtrusive.

Capability

With decades of hands-on expertise and specialized equipment, we deliver complex underground projects in all soil and rock conditions, above or below the water table. We continually refine our methods, creating patented tunneling processes and custom equipment to meet any challenge.

Efficiency

As experienced engineers, we design and build custom equipment and solutions to optimize projects, enhance safety, anticipate challenges, and so save time and money.

About Us
Our Work

Gallery

Gerrard

Watermain

ZONE 1

Watermain

Coxwell

Sanitary Bypass Tunnel

Georgetown

Sanitary Sewer

East Brampton

Watermain

Deep Lake

Water Cooling Expansion

Gerrard

Watermain

ZONE 1

Watermain

Coxwell

Sanitary Bypass Tunnel

Georgetown

Sanitary Sewer

East Brampton

Watermain

Deep Lake

Water Cooling Expansion

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Our Team

Careers

Tunneling requires strong, motivated, practical, dedicated and passionate individuals in a very competitive marketplace. If this sounds like you, visit our about page to learn more about a career at our company.

Smiling miner in orange safety jacket and yellow helmet inside a dark tunnel with another miner working behind him.
C&M McNally Icon Outlined
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Decades of
underground
expertise.

100+
Tunnels constructed
300+
Kilometers of underground
infrastructure built
20+ Cities
We've completed projects across
Canada & the United States