Green Line

New detailed plans for the Community Path

The MBTA released some high-resolution draft plans of the new Community Path route and associated access points, noise walls, and so on. Download the big PDF and take a look.

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Green Line

Green Line construction on track

“MBTA: No snags so far on Green Line extension work” (Boston Herald)

“The leader of the MBTA’s Green Line Extension project told T overseers Monday that the trolley service extension is about 60 percent designed and said he has not seen signs of possible snags on the horizon.

Dalton said the bulk of the construction-related work taking place now is related to drainage infrastructure, retaining walls and noise barriers. Demolition of buildings will begin later this month, he said, and the impacts of the construction will soon become more evident.

In late March, the Broadway Bridge will close for 12 months and the Washington Street bridge will be closed from April until November to accommodate Green Line Extension construction, Dalton said.”

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Green Line, Uncategorized

In-progress Green Line station plans

This month, the Green Line Extension (GLX) team shared updated station plans with the GLX Community Working Group. These are still evolving but worth a look. To see more, come to the Jan 30 public meeting.

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Your comments today could shape the future of Union Square and all of Somerville

Thursday, December 13 is the last day for sending comments to the Board of Aldermen about proposed zoning changes for the city.  Comments can be sent to

It is too late to submit written comments to the Planning Board but you might want to also send a copy of your comments to the Board of Aldermen to

Below are key issues about Open Space goals, transportation and Union Square zoning/design that are very significant for the proposed zoning changes.  It is important for the Board of Aldermen to hear from Somerville residents regarding concerns about the new zoning.  We urge you to review the zoning comments below and make your own comments to the Board of Alderman to address issues that are of concern to you.  With regard to Union Square, we urge you to think about how the proposed design changes to Union Square will transform this vital part of our city for the next 100 years.


The SOMERVISION 2010-2030 comprehensive plan for 125 acres of new open space must be codified in zoning. The City must provide a plan for where these open spaces will be sited in the transform and overlay areas. The City must use property it presently owns to increase open space in all parts of Somerville. The Open Space Task Force must seek out properties to acquire for increasing open space in its currently developed squares and neighborhoods.

Transportation and connectivity

  • Safe travel of pedestrians, cyclists and public transport must have priority over vehicles.
  • Safe pedestrian and bicycle connectivity must be increased throughout all of Somerville, especially in the UR and NR districts, so as to provide a more pleasant environment away from polluted roadways. Easements to or purchasing of property that would create this outcome must be prioritized.
  • Safe access to the Green Line must be provided in all station areas from all key directions. There must be direct access from east and west sides of Prospect Hill Bridge to the Union Square Station.
  • Construction of the community bike path must proceed in tandem with that of the Green Line.

Green and open spaces

  • Green space must be increased at every opportunity in a creative way in the public realm, i.e. increased sidewalk widths and bioswales, green roofs, plantings along highway and roadways, vines, living walls, planting all the layers of the forest (canopy, understory, shrubs, herbaceous, soil) in trenches, rather than only in tree wells, planting slopes, medians, flower boxes, etc
  • Before removal of any amount of green space in the public realm, the City needs to provide a plan on how and where that green space will be replaced, and that plan must be executed within a certain time period (12 months?).
  • Green Low Impact Development and sustainable design should be used.
  • City owned properties and the public realm should conform to the highest standards of sustainable design, and they should become the model for designing building standards in new zoning code.
  • Green Score, demolition review must be required for civic buildings.
  • Multi-unit buildings near highways and heavily trafficked roads should have high quality air filtration that is integrated with energy efficient heating, cooling and air supply not protect residents’ health.

Indoor Civic Space

  • Indoor civic space requirements must be described within the zoning code with regard to types similar to what has been specified for outdoor civic space.  (Thus, community centers would become a type.)

Community Benefits

  • Contributions must be made by developers of all upzoned properties to affordable housing, jobs, open space, sustainability, indoor civic space, arts and creative economy and the other community benefits and goals described in SOMERVISION.

Affordable Housing

  • An affordable housing overlay district must be created in areas around transportation centers and Green Line stations.
  • Workforce housing must be incorporated as a residential space type and required within zoning to exist as a certain percentage of total new housing.
  • Incentives should be given to landlords to charge below market rate for rental housing.


  • To preserve the funkiness and character of Somerville efforts should be made to provide creativity in developing the built environment in the zoning so that Somerville neighborhoods are distinctive rather than copying Assembly Row development/design model.


  • Big banks and chain stores must subsidize affordable commercial space for small businesses.
  • Parity must be achieved across all neighborhoods and squares as development and density in our transforming city increases.
  • Increase commercial construction (office and lab) in the transformative areas to 70% of the development,  so that live/work balance is achieve, increasing jobs in Somerville and reducing the city’s d and so that the city’s tax burden on residential property owners.

Arts and Creative Economy

  • Ensure that the arts and creative economy are preserved and created with more affordable, housing and/ or live work spaces for artists.  


Key Issues:

  • US2’s current proposal falls short – The design of the D2 block is a 100 year decision on one of the most important sites in Somerville.  US2’s proposal is based on the building massing described in the Union Square Neighborhood Plan, but this plan was created to reflect a prior two-level MBTA station design at Prospect Street that no longer exists.  The current proposal fails to integrate the new station configuration; it also falls short of providing great public space and neighborhood gateway via the Green Line. The new street being proposed fails to meet the standards of Somerville’s complete streets ordinance.  
  • The Union Square D2 design must, if economically feasible, provide underground parking to increase open space, and developers must demonstrate in a public hearing setting why such parking is not feasible if it, in conjunction with the City, makes such a claim. The natural location for the public plaza is in the interior of the D2 parcel, not adjacent to atmospherically polluted Prospect Street, as is currently proposed by US2.
  • The Union Square Development Plan must incorporate the Merriam, Linden, Allen, Rossmore and Mansfield street neighborhoods so they are zoned to reflect the zoning of the D-parcels that surround them. (MU, CC and HR).
  • Good design is critically important and should not be negotiable – The City has recently outsourced negotiation of a community benefits agreement to a private group known as the Union Square Neighborhood Council, which is negotiating an agreement with the developer in private.  It has been suggested that improved design is one of the things that is “on the table” in these negotiations.  However, it remains the responsibility of the City to guide the design review process in order to ensure the best possible outcome, particularly in a key civic location like the D2 block.  Getting this right is non-negotiable.
  • Integrate Union Square’s Station design and US2’s development – The city needs to take a leadership role in ensuring that US2 and the MBTA are working together to ensure a seamless and integrated plan for station access that prioritizes visibility, ease of use and accessibility from all directions and that realizes the promise of the green line that so many have worked over decades to achieve.  

Proposed improvements to US2 Design

  • The alternate plan by Talun and Tate appears to a viable, realistic scheme that has the potential to create better buildings, better streets, and a far more significant and usable public space.  This should be evaluated as an alternate as the design review process moves forward.  The key change that allows the alternate approach is the relocation of parking below grade.  The idea of having aboveground parking structures determining the urban design in key civic locations should be considered a thing of the past.  
  • Much-improved access and connectivity to the new T station– The actual entry and full path of travel to the T will be continuously visible from the point of entry to the public space and the street; it makes the new T stop a focal point in a new civic space instead of feeling like it is located in the back, adjacent to a garage and loading dock.
  • A high quality civic open space: The amount and quality of the public open space provides the size and flexibility to be a significant addition to the Union Square community.
  • A livable streetscape opposite the adjacent Allen Street neighbors as opposed to a three story parking structure; and,
  • An opportunity for variety of residential community experience – allowing some units to connect to the street and open space – making it possible to develop a stronger, longer lasting residential community.
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Health Issues

Worried about traffic pollution? The trucks are the biggest problem

“Large trucks are biggest culprits of near-road air pollution”

“Research consistently links traffic emissions to negative effects on both the environment and human health. “Whether it be cancer, respiratory problems, cardiac problems or neurodegenerative problems, there are numerous adverse health effects associated with the chemicals in these emissions,” said Evans. “If we were able to reduce emission of pollutants like black carbon, we would also see an immediate climate benefit.” Black carbon — commonly called soot — is a marker for exposure to diesel exhaust which is known to have negative health effects.”

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Green Line

Broadway bridge closure and proposed detours

The City of Somerville hosted a public meeting about the coming Green Line construction and its impact on the Broadway bridge area. View the slides that cover:

  • Current draft of traffic detours
  • Pedestrian and cyclist detours
  • Bus route changes

“At last, Somerville’s getting the Green Line, but road closures come with it” (Boston Globe)

Mark Niedergang, who represents the Ball Square neighborhood on the Somerville Board of Aldermen, said the city is still eager for the $2.3 billion transit project after years of delays — but the bridge closure will be a massive disruption.

“You’ve got to break eggs to make an omelet, but this is going to be very painful,” he said.

Niedergang and some neighbors are worried cut-through traffic will make local streets unsafe.

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Green Line

New Green Line opening dates

This is a first: The Green Line Extension schedule just got moved UP a bit. We had expected the Green Line to open in December 2021, but in the latest monthly status report, we have new projected dates:

  • The Union Square branch will open April 28, 2021.
  • The main (Medford) branch will open July 21, 2021.

This could still change, so cross your fingers.

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Green Line

Detours during Green Line construction

Some key bridges are closing during construction, and those impacts were made clearer at a July 18 public meeting on the Green Line Extension. View the presentation slides, which include information on:

  • New detours announced for vehicles, cyclists, and pedestrians, with maps of all the impacted roads
  • Community Path updated route
  • Construction status update
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Green Line

Bridge closures are coming during Green Line construction

Perhaps the most annoying price we’ll pay for the Green Line Extension are bridge closures during construction. Shown here is the current schedule, which may change. Dark green means a closed bridge. For most of these closures, that means no cars, no cyclists, no pedestrians.

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Green Line

New maps of the Community Path extension

The State has published new draft maps of the future Community Path that will live alongside the Green Line Extension. The new improved route avoids awkward bridge crossings, which is good news.

Old route:

New route:

View slides from the July 10 Community Working Group meeting. Keep reading for more maps.

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