Sumner Tunnel Closes Overnight on Boston Route 1A

MassDOT will close the Sumner Tunnel and Route 1A southbound to all traffic tonight for overnight repairs.

The window runs Friday, July 31, 2026, from 11:00 p.m., through 6:00 a.m., Saturday, according to the agency notice carried by the Boston Sun.

Ted Williams Tunnel on I-90 and the Callahan Tunnel on Route 1A northbound remain available, and a signed detour will be in place.

If you are landing late at Boston Logan, catching a rideshare to a waterfront hotel, or driving after a Fenway concert, the closed direction matters more than the headline.

Southbound Sumner is the cut. The alternate tunnels are not a free pass through zero traffic, but they keep a legal path open while crews work.

MassDOT said the closure is needed so crews can complete repairs and maintenance safely.

Work is weather dependent and can change without notice, which is why a last look at live conditions is part of the plan rather than an optional extra.

What is confirmed for tonight

The published window is exact enough for trip planning. Closure starts at 11:00 p.m., Friday, and reopens at 6:00 a.m., Saturday.

Only Sumner and Route 1A southbound are closed in the announcement. Ted Williams Tunnel and Callahan Tunnel remain open for the overnight period.

A signed detour will guide drivers around the work zone. Law enforcement details and messaging are part of the package MassDOT described for the overnight window.

Drivers should expect delays, reduce speed, and use caution near the work area.

Overnight tunnel work compresses remaining capacity into the open tubes and surface streets that already carry airport and event traffic.

For a second live check surface, MassDOT points travelers to the Mass511 site and app for cameras, travel times, and alerts.

Dial 511 for audio updates, and follow @MassDOT on X for road condition posts during the overnight window.

How this hits Logan and East Boston trips

Logan International Airport sits on the East Boston side of the harbor tunnels.

Many downtown, Back Bay, and South End hotel trips rely on the Sumner, Callahan, or Ted Williams tubes depending on direction and time of night.

When Sumner southbound is dark, drivers who would have used that tube need the published open options or the signed detour.

Rideshare pickups after a late arrival can still leave the terminals, but the app route may swing through Ted Williams or surface streets and add time.

If your flight is scheduled to touch down after 10:30 p.m., build buffer before a hard hotel check-in or a connection to a late train.

A 20-minute delay in the open tunnels is common when one tube is offline, and concert spillover can stack on top of that.

Travelers staying in East Boston can often avoid the closed direction entirely by keeping hotel and dining plans on the airport side of the harbor until morning.

That is a practical split when the only required trip is a short hop back to the terminals early Saturday.

If you must cross the harbor after 11:00 p.m., choose the open tube that matches your direction instead of waiting in a closed southbound queue.

Concert weekend and stacked city traffic

The same Boston Sun brief notes a busy Fenway Park concert weekend, including Phish on Friday, July 31, and Saturday, August 1.

That is not the tunnel order, but it is the same city night for drivers leaving the ballpark.

If you are leaving Fenway after the show and aiming for East Boston or the airport, assume longer exit queues even before you reach a tunnel portal.

Public transit or an earlier departure from the venue is the cleaner path when the Sumner southbound is already scheduled dark.

Cruise guests with a Port of Boston embarkation on Saturday morning should treat the overnight closure as a Friday night problem, not a Saturday midday one, unless work overruns.

Still recheck Mass511 after 5:00 a.m., if you must leave a hotel before 6:00 a.m., Saturday.

Deep Arrival's where to stay in Boston guide remains useful for choosing a neighborhood that matches your next-day plans when tunnel access is uneven overnight.

Port logistics for ships calling Boston are covered separately in the Port of Boston cruise terminal address and directions page, which helps map terminal approaches once tunnels reopen.

Hotel guests near the waterfront should ask the desk which drop-off streets stay open if your rideshare is rerouted around the signed detour.

Three traveler checks before you move

First, confirm whether your trip actually needs Route 1A southbound. Many airport-to-downtown paths can use Ted Williams or the Callahan depending on direction.

Do not default to a remembered Sumner habit without checking the map for tonight's open tubes.

Second, open Mass511 within an hour of departure. Cameras and travel times catch weather holds, crash backups, or an early return to service that a static article cannot.

Third, if you are in a rideshare or taxi, state the open tunnel preference up front so the driver does not follow a closed-habit GPS path.

Drivers may still follow a cached route into a queue you can avoid with the signed detour.

A concrete scenario helps. A passenger lands at 11:40 p.m., Friday, with a hotel in downtown Boston.

Instead of waiting in a Sumner-bound queue that is closed, the traveler should allow the app to route via Ted Williams or the signed detour.

Message the hotel if arrival slips past midnight, and keep walking shoes ready if the final blocks are faster on foot from a drop-off point.

If your outbound flight is early Saturday, reverse the problem: leave the downtown hotel with enough time for open-tunnel congestion rather than a closed southbound shortcut.

Use Ted Williams or Callahan for trips that would have used Sumner southbound, leave earlier than your usual Logan transfer, and recheck Mass511 before you lock a rideshare.