MBTA Green Line Extension – Design Reviews

Massachusetts Department of Transportation - Highway Division | Cambridge, Somerville and Medford, MA
Photo of design review of the MBTA Green Line Extension

The Massachusetts Bay Transportation Authority (MBTA) Green Line Extension (GLX) is a $1.3B Design-Build project that consists of a 4.5-mile extension of electrified light rail along existing commuter rail tracks. Benesch has been working with the Massachusetts Department of Transportation (MassDOT) – Highway Division to provide peer review services for several bridge designs throughout the state.

The project included many different types of structures such as a new vehicle maintenance facility, new stations that include platforms, walkways, headhouses, elevated platforms that tie into nearby bridges, 1.5 miles of elevated viaduct and community path structure, replacement or modification of six bridges, three new traction power stations, drainage structures, overhead contact system (OCS) poles, and more than 3.5 miles of retaining walls.

Benesch served as design review of the bridges and retaining walls associated with MassDOT Highway Division.

GZA served as the lead geotechnical engineer providing the geotechnical design for all permanent structures, permanent and temporary support of excavation retaining walls, instrumentation monitoring and quality control during foundation construction for the design builder, GLX Constructors LLC. C&C provided structural engineering for three bridges and several retaining walls.