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Bridge, tunnel and marine structures

Photo: Mogens Carrebye
COWI draws on its more than 80 years of experience to remain one of the world's leading infrastructure consultancy companies.

In recent years, COWI has been part of the design and operation and maintenance of some of the world’s largest offshore wind farms, deepest immersed tunnels, longest bridges and most complex marine structures.

Poised for the future

As we look towards tomorrow, this trend will continue. Our operation and maintenance activities increase, and COWI is poised to remain one of the world's leaders in the field.


COWI is an international market leader in bridge engineering. A professional staff committed to finding innovative solutions helps to continue the company’s tradition for designing the world's most challenging bridges. We have been involved in hundreds of bridge projects around the world, from some of the world’s longest road and rail spans to modest pedestrian crossings.

We work for a wide range of clients, including public clients, donor organisations, private developers and contractors.


Whether underwater, underground or both, tunnels and other subsurface structures have a wide variety of uses. During our history, we have been involved in the construction of all manner of tunnels around the world, and in all types of soil.

COWI's services cover the entire lifecycle of a tunnel, from feasibility studies to the operational phase and finally rehabilitation or decommissioning.

Marine, coastal and geotechnical engineering

Our involvement in marine, coastal and geotechnical engineering projects spans the entire lifecycle of a structure, from planning to decommissioning, and our services range from consultancy relating to a specific issue to comprehensive planning and total engineering design and implementation.
Our extensive international track record in the field stretches across six continents. Though diverse in their scope, common for all of our projects is a lasting relationship with the client that seeks to provide added value.

LAST UPDATED: 03.07.2017