Brierley Associates is a privately-held national tunnel, trenchless, geotechnical, and geo-structural design firm with offices strategically located across the United States. With over 60 underground  engineers and geologists, Brierley Associates has a long history of delivering recognizable value to our clients by providing cost effective and constructable solutions for underground and heavy civil infrastructure projects.

Our team 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.

The nationwide and international underground project knowledgebase of Brierley Associates is key to anticipating ground behavior and helping our clients with design and construction of successful projects which is the cornerstone of Brierley’s business vision to… “Create Space Underground”.

Press Room

Checkout out our Press Room for past issues of our In Depth Newsletter and published papers and articles.

Widening of Eastbound I-70 Tunnel – Idaho Springs, Colorado

Enlargement and widening of the eastbound tunnel of the I-70 Twin Tunnels in Idaho Springs Colorado was the selected by Colorado Department of Transportation as the best way to improve traffic flow and reduce congestion of this heavily travelled roadway that leads to ski resort and recreational

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Twin Box Tunnels – Liberty University, Lynchburg, Virginia

In December of 2013 this project at Liberty University had reached the halfway point with the first of the two 2,100 ton, 16 foot high, 28 foot wide, 130 foot long cast on-site reinforced concrete box tunnels in place. The two vehicular tunnels will provide access to

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New Hampshire

New York






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Brierley Associates is a self-certified Federal Small Business