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Route 18 Widening Project

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Project Summary

The MassDOT proposed project consists of reconstructing and widening Route 18 from Highland Place in Weymouth to Route 139 in Abington including the replacement of the Route 18 Bridge W-32-13 over the MBTA. The roadway widening will provide an additional travel lane in each direction. A temporary alignment will be constructed adjacent to the bridge to the east to carry Route 18 traffic while the existing bridge is being replaced. A three day weekend shutdown of MBTA service and detour of Route 18 traffic using Pond Street will be required to slide the new bridge superstructure onto the final bridge supports. The proposed roadway cross section consists of four 11.5' travel lanes, two 5' shoulders and two 5.5' sidewalks. Shared accommodations for all users have been provided in accordance with applicable guidelines.

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.

Environmental Review Process

MassDOT has gone through 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 has filed 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

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

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.


Once the contract has been awarded to the Contractor this summer, Public Outreach will begin by having a meeting in the Town of Weymouth prior to beginning any construction. Both MassDOT and the Contractor will have representatives present to help answer any questions.

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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