Project schedule and public information: I-495/I-90 interchange improvements

Improving safety and addressing traffic conditions at the interchange of I-495 and I-90

Project schedule and public information

We are implementing an extensive outreach program due to the strategic location and regional importance of the I-495/I-95 interchange. The impacts of the project will be experienced by stakeholders immediately adjacent to the interchange, in nearby communities, as well as travelers who live, work and conduct commerce in the region. Dynamic, diverse and far-reaching engagement strategies are being implemented for this project.

Project design began in May 2022 and will continue through December 2024. As designs are completed and reviewed, construction will begin. There are 5 stages of construction:

Stage 0  October 2022 to April 2023

Enabling work including fiber relocation and temporary Ramp ES/SE

Stage 1  December 2022 to September 2024

Complete future I-495 NB in median, Fruit Street and Ramps ES & WN

Stage 2  June 2024 to May 2026

Complete future I-495 SB, Ramps WS & SE

Stage 3/3b  April 2025 to April 2027

Complete Ramp NE, NW, SW & EN

Stage 4  August 2026 to June 2027

Complete I-90 widening, remove former loop ramps and complete environmental mitigation areas

Environmental context

The areas in-and-around the interchange contain many sensitive environmental resources. These include the:

  • Cedar Swamp Area of Critical Environmental Concern (ACEC)
  • Areas of designated open space
  • Sudbury River riverfront, with floodplain, wetlands, and priority habitat for endangered & threatened species

The project aims to avoid or minimize impacts to these resources and provide mitigation for any unavoidable impacts.

Contact   for Project schedule and public information: I-495/I-90 interchange improvements


To report a noise complaint, please call the project hotline: (508) 676-3551 Sign up for project updates 


10 Park Plaza, Room 4260 - Project No. 607977, Boston, MA 02116

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