About the I-495/I-90 interchange improvements project

The purpose of the I-495/I-90 interchange improvements project is to provide a safe and efficient interchange of the interstate highways I-495 & I-90

The project team is refining three conceptual alternatives for evaluation and public comment. These were presented to the public through the 2015 publication of an Environmental Notification Form (ENF) (EEA No 15334). Building from pieces of those three, we have also developed a fourth alternative.

At the same time, MassDOT is continuing the safety, operations, and environmental studies begun for the ENF. These include traffic and crash evaluations as well as environmental-impact evaluations. We are also beginning to investigate potential mitigations to compensate for any unavoidable impacts.

We want to understand your experiences and the public's desires for this project. Visit our I-495/I-90 Interchange Improvement Project Interactive Map to register comments and recommendations about the project.

Next Steps

We are currently in the environmental review stage of this project. This will culminate in the publication of an Environmental Impact Report (EIR). Before this, a Draft EIR (DEIR) will identify a preferred alternative and provide preliminary analyses. These documents will be reviewed by the Massachusetts Environmental Policy Act (MEPA) Office, under the Secretary of Energy and Environmental Affairs.

The project team is mindful of the importance of getting this project done quickly, and right. To this end, we are working closely with our federal partners and state & local agencies.

The environmental review and permitting process will be integrated with federal National Environmental Policy Act (NEPA) review. This is in collaboration with the Federal Highway Administration (FHWA)'s "Every Day Counts" Initiative. "Every Day Counts" aims to speed up the delivery of transportation projects by facilitating efficiency and coordination. Integrated permitting is one example of many innovations used since the program began in 2009.

After the environmental review phase, the preferred alternative will have advanced to 25% design. Public outreach and input will be central throughout this process. The project will then be advertised under the MassDOT Design Build Program. The current timeline envisions construction from 2022-2026.

Schedule - Public Involvement

  • Purpose and Need - Measures of Effectiveness (MOES)
  • Refine Alternatives
  • Alternatives Analysis
  • Recommended Preferred Alternative
  • 25% Design, Permitting
  • Final Design
  • Construction