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Sumner Tunnel, which connects Logan Airport to Cambridge, will close from July 5 to August 31

The Sumner Tunnel on Route 1A connecting East Boston to downtown Boston will close. The Callahan Tunnel running in the opposite direction of Route 1A, from downtown Boston to East Boston, will remain open.

The Sumner Tunnel, a key connection from Logan Airport and East Boston to downtown Boston and Cambridge, will fully close for restoration work between Wednesday, July 5, and Thursday, August 31, 2023.

Drivers will not be able to travel through the tunnel on Route 1A South, which runs under Boston Harbor and links Logan Airport and East Boston to downtown Boston and I-93. Traffic will be diverted to detour routes. The Callahan Tunnel, which runs in the opposite direction (from the North End to East Boston), will remain open.

While the Sumner Tunnel is closed, traffic will be rerouted to other roads, which will likely impact regional traffic patterns – about 39,000 vehicles travel through the tunnel each day. People driving in Greater Boston should expect increased congestion. Click here to see MassDOT’s suggested detours.

The Massachusetts Department of Transportation (MassDOT) encourages people to build in extra travel time, adjust what time you leave your house, work from home if you can, and/or consider alternatives to driving.


To help encourage people to take public transit rather than drive into the city, MassDOT will:

Click here for a full list of services and discounts that MassDOT is offering.

The Project

MassDOT is undertaking a top-to-bottom restoration of the Sumner Tunnel to bring it into compliance with current design and safety standards. The restoration will include restoring the ceiling, fireproofing and painting the walls, installing new lights, and improving the roadway surface. Click here to learn more.

Contact Information

Contact the project team at Sumner100@dot.state.ma.us or (508) 510-2920.

Key Links

Page was posted on 6/29/2023 3:51 PM
Page was last modified on 7/25/2023 1:55 AM
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