description Callahan Tunnel Overview
The Lieutenant William F. Callahan Jr. Tunnel is a road tunnel beneath Boston Harbor in Massachusetts. Opened in 1961, it runs between downtown Boston and East Boston, parallel to the older Sumner Tunnel, and carries traffic away from the city center toward Logan International Airport and surrounding routes.
It forms part of the harbor crossing system linking central Boston with communities and transport facilities to the east.
help Callahan Tunnel FAQ
Which way does the Callahan Tunnel carry traffic?
The Callahan Tunnel carries outbound Route 1A traffic from downtown Boston and the North End toward East Boston and Logan International Airport. Its parallel neighbor, the Sumner Tunnel, carries traffic in the opposite direction toward downtown. ([Massachusetts transportation report](https://www.mass.gov/doc/metropolitan-highway-system-bonds-1997-series-a-b/download))
When did the Callahan Tunnel open?
The Callahan Tunnel was completed and opened to traffic in 1961. It was built as a parallel harbor crossing to the older Sumner Tunnel. ([Massachusetts transportation report](https://www.mass.gov/doc/metropolitan-highway-system-bonds-1997-series-a-b/download))
How is the Callahan Tunnel different from the Ted Williams Tunnel?
The Callahan is a Route 1A crossing serving outbound traffic, while the Ted Williams Tunnel is part of the I-90 connection and opened in December 1995. Before the Ted Williams Tunnel opened, the Sumner and Callahan were the main tunnel crossings to Logan Airport. ([Massachusetts transportation report](https://www.mass.gov/doc/metropolitan-highway-system-bonds-1997-series-a-b/download))
What is the vehicle-height limit for the Callahan Tunnel?
MassDOT's truck-check tool lists a maximum height of 12 feet 6 inches for the Callahan Tunnel. Drivers of tall vehicles should check current route restrictions before entering. ([MassDOT Truck Check](https://truckcheck.mass.gov/height))
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