Green Line Extension

The Green Line Extension (GLX) project will construct six new Green Line stations from a new Lechmere Station in Cambridge along two branches -- the Union Square and Medford branches. As part of this extension, a new Lechmere station is under construction across Route 28/O'Brien Highway. In addition, the MBTA will be rehabilitating the Lechmere Viaduct at the same time as the Green Line Extension is closing Lechmere station.

Click here to visit the Commonwealth's GLX web site.

Information on construction impacts from GLX construction

The Green Line Extension project team is currently constructing a new Lechmere station and busway across O'Brien Highway (Route 28) from the old Lechmere station. Please visit the Commonwealth's Green Line Extension project site for more information.

Information on construction impacts from Lechmere Viaduct construction

The MBTA is also rehabilitating the Green Line viaduct by the Museum of Science. The construction for this separate project may have additional impacts to neighbors and abutters. Please visit the MBTA Green Line Transformation website for more information.


May 2021

May 6 The MBTA asked the public to save the date for the next Green Line Extension public meeting on Wednesday, June 30, 2021 from 6:00 PM using remote participation. The meeting will provide updates about construction, project milestones, testing and commissioning before public service begins. Meeting information will be posted to the GLX website. Click here to visit GLX website.

May 4 The MBTA's Green Line Extension (GLX) Community Working Group met with the MBTA and GLX Staff on May 4, 2021 using remote participation. A meeting presentation and minutes have not yet been posted online.

April 2021

April 6 The MBTA's Green Line Extension (GLX) Community Working Group met with the MBTA and GLX Staff on April 6, 2021 using remote participation. Click here for meeting presentation. Click here for meeting minutes.

March 2021

March 2 The MBTA's Green Line Extension (GLX) Community Working Group met with the MBTA and GLX Staff on March 2, 2021 using remote participation. Click here for meeting presentation. Click here for meeting minutes.

February 2021

February 2 The MBTA's Green Line Extension (GLX) Community Working Group met with the MBTA and GLX Staff on February 2, 2021 using remote participation. Click here for the meeting presentation. Click here for the meeting minutes.

January 2021

January 5 The MBTA's Green Line Extension (GLX) Community Working Group met with the MBTA and GLX Staff on January 5, 2021 using remote participation. Click here for the meeting presentation. Click here for the meeting minutes.

December 2020

December 9 The MBTA's GLX project team hosted a meeting with remote participation to share updates on the GLX project. Click the links below to see:

From the project web site, benefits will include:

  • Provide new and better opportunities for residents and visitors to travel within their communities and within the region, address long-standing transportation inequities.
  • Result in fewer automobiles on local roads and help combat greenhouse gas emissions and other components of air pollution.
  • Support municipal plans for sustainable growth and development.
  • Provide residents of environmental justice communities with faster rides to work and other destinations.

See the Green Line Extension web page for further details and to sign up for the project contact list. 

At the same time, the relocation of Lechmere Station across O'Brien Highway is being coordinated with the build out of North Point by DIVCO.  DIVCO is responsible for the reconstruction of O'Brien Highway and is working closely with the City of Cambridge and the state to improve existing crossings, and to create new crossings to make the new station readily accessible to the East Cambridge neighborhood.

In 2015, Green Line Extension Project was put on hold due to cost overruns, so that the MBTA could modify the project to reduce costs and rebid the project with an estimated completion date of 2021. The new project was expected to cost up to $1.3 billion, not including the cost of various additive options, including station canopies, an art program, additional elevators (including at Lechmere), full path connections (including from Washington Street to Lechmere), and an enhanced maintenance facility as proposed in the original project. On November 17, 2017, the MBTA opened price proposals for the bidders, and recommended a team, GLX Constructors. The winning bid was less than $1.1 billion and included all additive options. Click here for the presentation to the FMCB about the selection of the bidder and additive options.

Click here for the GLX presentation from October 23, 2017 with updates for the GLX project rebidding and upcoming schedule.

Green Line Extension to Mystic Valley Parkway / Route 16

On October 17, 2017, the MBTA filed a Notice of Project Change (NPC) for the Green Line Extension Project with the Executive Office of Energy and Environmental Affairs (EEA). The NPC presents a preliminary proposal for a one-mile extension of the Green Line along the MBTA Lowell Line commuter rail right-of-way from the currently planned terminus at College Avenue in Medford to Mystic Valley Parkway (Route 16) in Medford and Somerville. The NPC was noticed in the November 8, 2017 edition of the Environmental Monitor and a public meeting was scheduled for November 20, 2017. No funding source or timeline for project construction has been established yet.

 

2020

December 9MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff.

December 1 MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff.

November 3 MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff.

October 6 MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff.

September 1 MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff.

August 28 Weekend closure of Monseignor O'Brien Highway

August 7 Weekend closure of Monseignor O'Brien Highway

August 4MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff.

July 27 Green Line Transformation began a series of weekday closures of Museum Way between 7AM and 5PM. 

July 24 Weekend closure of Monseignor O'Brien Highway

July 17 Weekend closure of Monseignor O'Brien Highway

July 10 Weekend closure of Monseignor O'Brien Highway

July 10 Weekend closure of Monseignor O'Brien Highway

July 7 MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff. Click here to see the presentation and meeting minutes.

June 24 MBTA GLX team hosted a public meeting to update the public on the progress of the project and expected future construction locations. Click here to see presentation.

June 2 MBTA's GLX Community Working Group met with MBTA and Green Line Extension staff. Click here to see the presentation and meeting minutes.

Early June MBTA GLX team reopened Washington Street and Broadway in Somerville

May 24 MBTA began running a Green Line-replacement bus shuttle between Lechmere and North Station, using temporary exclusive bus lanes on Route 28.

May 23 MBTA closed the Green Line between Lechmere and North Station

Spring MBTA announced that the project schedule was under pressure, but, remained confident in opening the entire GLX by December 2021. GLX project team also confirmed that Green Line service would return to Lechmere and new service to Union Square would begin as early as May 2021.

2019

Early April The Green Line Extension project has closed two streets in Somerville that affect driving and bus routes to/from Cambridge. 

2018

After some re-design and cost cutting measures to bring the project in line with the budget, and a successful re-bidding of the project, Green Line Extension began construction in phases. MBTA announced that service on the entire GLX was expected in late 2021.

2017

November 17, MBTA opened price proposals for the bidders, and recommended GLX Constructors for constructing the project. The winning bid was less than $1.1 billion and included all additive options: station canopies, art, additional elevators, full multi-use path connections, and an enhanced maintenance facility.

October 17, the MBTA filed a Notice of Project Change (NPC) for the one-mile extension of the Green Line along the MBTA Lowell Line commuter rail right-of-way from the currently planned terminus at College Avenue in Medford to Mystic Valley Parkway (Route 16) in Medford and Somerville. The NPC was noticed in the November 8, 2017 edition of the Environmental Monitor and a public meeting was scheduled for November 20, 2017. No funding source or timeline for project construction has been established yet.

2015

The MBTA put the Green Line Extension project on hold due to cost overruns

 

For more information, contact Andrew Reker at areker@cambridgema.gov or 617/349-6959.