Tom Lantos Tunnels - San Mateo County, Calif.

SR99 Alaskan Way Viaduct and Seawall Replacement - Seattle

Sound Transit University Link - Seattle

Washington Dulles International Airport Tunnel - Washington, D.C.

Minneapolis-St. Paul International Airport Light Rail Transit Tunnels and Lindbergh Station - Minneapolis

San Francisco BART Station - San Francisco


Innovative tunnel solutions

HNTB has a long history in design and support services for tunnel structures, from planning through final design and construction. The firm has completed award-winning work on some of the country’s most complex tunneling projects, including experience in highways, transit, rail, aviation and water resources. Our experts have the insight and knowledge to provide innovative solutions to tunneling challenges, from small-diameter excavations to the largest machine-bored tunnel in the world.