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Longfellow Approach Viaduct Rehabilitation

The Longfellow Viaduct at Charles/MGH Station on the Red Line

The Longfellow Approach Viaduct carries the Red Line from the Beacon Hill tunnel portal—over Charles Circle and through Charles/MGH Station—to the Boston end of the Longfellow Bridge.

We are rehabilitating the structure to increase passenger safety, improve accessibility, and reduce the cost of maintenance. The viaduct, which was built between 1911 and 1912, is historically significant—it’s listed in the Massachusetts Historical Commission’s “Inventory of Historic and Archeological Assets of the Commonwealth.”

  • Design Notice to Proceed: October 2019
  • 100% design: October 2021
  • Construction start: Spring 2022
  • Projected completion: Fall 2024

Building a Better T

As part of our $8 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more

Project Features

There are 3 major project components:

  • Viaduct rehabilitation: Repairing and replacing structural elements of the bridge over Charles Circle to lower maintenance costs and extend service life for another 75-plus years, while preserving the historic structure
  • Platform replacement: Installing new platforms and making cosmetic improvements at Charles/MGH Station to make it safer and cleaner, and more accessible for people with disabilities
  • Span work: Replacing deteriorated concrete and framing that supports the Red Line on Span 1 of the Longfellow Bridge to extend its service life to 75-plus years

What You Can Expect

During the design phase, we’ll reach out early and often to get feedback. This will help us plan construction in a way that minimizes noise, service disruptions, and traffic impact on the neighborhood. We'll work closely with:

  • Neighborhood, civic, recreational, and business groups
  • Red Line riders
  • Bicycle and pedestrian advocates
  • Elected officials

Once construction begins, we’ll post updates on any service changes or neighborhood work to help people plan for changes in advance, and respond to any issues or concerns. We’ll provide information through:

  • Public meetings
  • Briefings
  • Fact sheets and construction updates
  • Website updates
  • Email blasts
  • Social media posts
  • Press updates

Contact Information

For inquiries and comments related to the Longfellow Approach Viaduct Rehabilitation, please send us an email at LongfellowViaduct@MBTA.com

For More Information

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Building a Better T

As part of our $8 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more