Callahan Tunnel

The Lieutenant William F. Callahan Jr. Tunnel (colloquially Callahan Tunnel) is a road tunnel under Boston Harbor between the North End and East Boston. It carries northbound Massachusetts Route 1A, forming a one-way pair with the Sumner Tunnel. Opened in 1961 to complement the Sumner Tunnel, it carried all northbound traffic under the harbor until the Ted Williams Tunnel opened in the 1990s as part of the Big Dig.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in United States

Delaware Aqueduct United States · 137 km Päijänne Water Tunnel Finland · 120 km Orange–Fish River Tunnel South Africa · 82.8 km Ishikawa Tunnel Japan · 78.5 km Brenner Base Tunnel Austria · 64 km Mont d'Ambin base tunnel France · 57.5 km Gotthard Base Tunnel Switzerland · 57.09 km Hong Kong–Zhuhai–Macau Bridge China · 55 km