Central Artery/Tunnel


Central Artery/Tunnel

Boston, MA

About this Project

The massive Central Artery/Tunnel (Big Dig) project has transformed the face of Boston with dramatic changes to the City’s highway and roadway system. FST, in joint venture served as prime consultant on three major sections of this complex project:

North Street to Congress Street – FST completed design of a 3,400 foot long section consisting of a cut-and-cover tunnel up to 90 feet below grade through the heart of downtown Boston. This structure consists of adjacent northbound and southbound tunnels, each for to five lanes, with on- and off-ramps, utility rooms, emergency egresses, pump stations, and other ancillary structure.

This section of the Big Dig was the recipient of the ACEC Massachusetts Engineering Excellence 2001 Grand Conceptor Award.

FST also designed two major sections of the Big Dig at Logan International Airport:

Logan Airport Interchange –This design, recipient of the 2004 ACEC Massachusetts Engineering Excellence Gold Award, provides the new gateway roadways to and from Logan International Airport. The $200 million roadway system includes four viaduct loop ramps, two tunnel structures, two depressed roadway sections, and several at-grade roadways

East Boston Airport/Route 1A Interchange – This $200 million project involved design of the highway connections to Logan International Airport from the Ted Williams Tunnel, the Callahan and Sumner Tunnels, Route 1A, and local streets, along with access to a rapid transit station. There are six viaducts, with 1.5 miles of elevated roadways and approach structures, and 10 surface roadways totaling 4 miles, along with two new parks.

More Information

Owner: Massachusetts Department of Transportation (formerly Mass Highway)

Location: Boston, Massachusetts

Highlights: FST's work on the Central Artery/Tunnel (CA/T) project earned two major awards from the Massachusetts Chapter of the American Council of Engineering Companies (ACEC).