Brierley Associates is a privately held national tunnel, trenchless, geotechnical, and geostructural design firm with offices strategically located in eight states. With over 55 underground engineers and geologists, Brierley Associates has a long history of delivering recognizable value to our clients and projects by providing cost effective and constructible solutions.

Brierley Associates understands that planning, design, and construction of subsurface projects is a complex mixture of client needs, contractual preferences, risk allocation, third party requirements, design criteria, and subsurface conditions.

Brierley Associates is experienced in all aspects of tunnel and trenchless design and construction; including feasibility and risk assessment, geologic and geotechnical site characterization, contractor procurement, and construction management.

Brierley Associates nationwide and international underground project knowledgebase and is key to anticipating behavior and helping our clients with design and construction of successful projects.

All of us at Brierley Associates, share a common business vision; one that is dedicated to the service of our clients, as we
“Create Space Underground”.


Tunnel Design

Brierley Associates is organized to provide seamless planning,
design, construction management and forensic services for underground space projects.

Trenchless Design

Trenchless Design

Brierley Associates is a recognized national authority in the application, design, management, forensic analysis and implementation of trenchless technologies for underground infrastructure rehabilitation and new installation.

Geostructural Design

Geostructural Design

Brierley Associates provides geotechnical engineering services for heavy civil projects with an understanding of ground conditions through rigorous investigation, accurate description of subsurface and surface characteristics and analysis and judgment based on experience.

Geotechnical Design

Geotechnical Design

Brierley Associates can design a wide array of support of excavation systems. We have the skill sets needed to evaluate subsurface conditions at your project site and develop constructible and cost effective support systems.

Recent Project Bi-County Water Tunnel

Bi-County Water Tunnel

The Bi-County Water Tunnel project consists of approximately
5.3 miles of tunnel. The tunnel alignment will be constructed beneath Rock Creek Park, I-270/I-495, and existing WSSC rights-of-way. The tunnel is located at depths ranging from 90 feet to 275 feet below ground surface in rock with tunnel access to the surface via three vertical shafts.

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Office Locations







New Hampshire

New York


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