The Official Website of The Massachusetts Department of Transportation - Highway Division

Route 18 Widening Project

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Project Summary

MassDOT is proposing to widen and make improvements to a portion of Route 18 in Weymouth and Abington. The project includes reconstruction of portions of a 4.1-mile segment of Route 18 and the bridge that carries Route 18 over the MBTA railroad tracks in Weymouth. The project extends from the intersection of Carmada Road/Highland Place southbound to just before the intersection of Randolph Street (Route 139).

Construction will include widening the roadway from a two-lane rural arterial with variable shoulders and minimal sidewalks to a four-lane undivided arterial with uniform shoulders and sidewalks along both sides of the entire roadway. The project will address traffic congestion, intersection upgrades, and traffic signals, as well as improve the roadway surface and curbing conditions. The proposed improvements and widening will improve safety and circulation for vehicles, pedestrians, and bicyclists. In addition, the project will support economic development along Route 18 and the surrounding area, including the development of the former South Weymouth Naval Air Station in Abington, Weymouth, and Rockland.

Overview of Environmental Review Process

MassDOT is continuing a full environmental review process for this project in compliance with all applicable federal and state regulations to avoid, minimize, and mitigate impacts to environmental resources. MassDOT will file applications and/or documentation to comply with all applicable Federal regulations including the National Environmental Policy Act with the Federal Highway Administration, a Section 404 permit with the United States Army Corps of Engineers, a Water Quality Certification Application with the Massachusetts Department of Environmental Protection (MassDEP), the Wetlands Protection Act with the Weymouth and Abington Conservation Commissions and MassDEP, and Massachusetts Endangered Species Act through the Natural Heritage and Endangered Species Program. Most of these permit applications will be filed in 2012/2013 following the completion of the 25% design.

The project was initially filed with Massachusetts Environmental Policy Act (MEPA) as part of the South Weymouth Naval Air Station's Environmental Notification Form (ENF) (EEA# 11085R). A Supplemental Environmental Impact Report (SEIR) was filed with MEPA in 2012 resulting in the issuance of a Secretary’s Certificate on September 28, 2012, indicating the project adequately and properly complies with MEPA. A Finding of No Significant Impact under NEPA was issued on September 15, 2009 for the Environmental Assessment prepared for Route 18.

Project Documents

Design Public Hearing Questions and Answers (PDF 110kb)

Responses to 10-17-12 Public Meeting Comments (PDF 145kb)

Public Information Meeting Presentation from the October 17, 2012 Public Hearing. (PDF 9.25mb)

Site Location Map (PDF) - The project area map depicts the Route 18 Widening Project Area. The project area is a 4.1 mile segment of Route 18 in Weymouth and Abington and the bridge that carries Route 18 over the MBTA railroad tracks in Weymouth. The project extends from the intersection of Charmada Road/Highland Place in Weymouth southbound to just north of the intersection of Randolph Street (Route 139) in Abington. The map includes geographic features and streets which intersect this section of Route 18.


There are no meetings currently scheduled

Getting Involved

If you have any questions, need further information, or want to be added to future informational mailing lists, please
contact Donny Dailey in the Office of Public Affairs.

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