The Thresholds arch, a weathered-steel archway glowing on the harborwalk by the Lewis Mall Wharf at sunset, with the Boston skyline across the harbor

Threshold 2: Lewis Mall Wharf — CROSSING

Engineering passage across Boston Harbor

Connection is made, not found.

1868

The harbor connected East Boston to the world. It also separated the neighborhood from the rest of its own city.

U.S. Army engineer John G. Foster imagined a street beneath the water. In this illustration from his proposal, carriages pass below while ships sail above. As Boston considered a bridge, Foster offered a way to connect the shores while keeping the port unobstructed.

In 1904, the East Boston Tunnel opened as the nation’s first underwater subway tunnel. Today, it carries the MBTA Blue Line.

1961

Nearly a century later, workers stand inside the immense ribs of the Callahan Tunnel being built.

The East Boston subway and the Sumner road tunnels had transformed how people crossed the harbor. As trains filled and road traffic grew, another generation was building a new way across.

Their work now carries tens of thousands of people across the harbor every day.

Today

You stand at Lewis Mall Wharf, beside the ferry dock. The Blue Line runs beneath this waterfront.

In 1995, the Ted Williams Tunnel opened another route beneath the harbor to East Boston and Logan Airport, the region’s gateway to the world.

The historic South Ferry served this waterfront from the 1830s until 1952. In 2022, the MBTA East Boston ferry carried that tradition forward, again linking this wharf with downtown.

A boat across the water. A train beneath it. A route to work, to family, to home.

Each generation has imagined and engineered new and nearly miraculous ways to connect East Boston with the world. We continue their work whenever we build, repair, or improve a connection others depend on.

We turn obstacles into connections.

Discover the thresholds connecting East Boston through history, innovation, and culture.

The Golden Thread

East Boston

Sources & Image Notes

Original Asset Citations

[1] J. G. Foster’s proposed submarine tunnel. Original illustration / digitally enhanced.

[2] Building the Callahan Tunnel. Original photograph / digitally enhanced.

Photo Citations

The images used on the physical threshold sign are AI-assisted digital restorations and colorizations derived from the original black-and-white photograph shown here. They were created to improve legibility at public-sign scale. Color, contrast, and some reconstructed detail are interpretive and should not be understood as a documentary color record.