MA 1A

Callahan Tunnel (Suffolk County, Massachusetts)
Built 1961
Tunnel under Boston Harbor on East Boston Expressway (MA 1A)
Open to traffic

Sumner Tunnel (Suffolk County, Massachusetts)
Built 1934; Converted to one-way westbound traffic in 1961
Tunnel under Boston Harbor on East Boston Expressway (MA 1A)
Open to traffic

Veterans Memorial Bridge (Essex County, Massachusetts)
Built 1997
Steel stringer bridge over Crane River (Danvers River) on Sgt. James Ayube Memorial Drive (MA 1A)
Open to traffic

Walpole Tunnel (Norfolk County, Massachusetts)
Built 1848 by original Norfolk County Railroad
Stone arch tunnel carrying MBTA Franklin Branch on under Main Street (MA 1A) in Walpole. Administered as a bridge by the State.
Open to railway traffic below, and to vehicle and pedestrian traffic above