Triple-barreled

Charlestown Bridge (Suffolk County, Massachusetts)
Built in 1900 to replace the Charles River Bridge which opened in 1786. It carried an elevated railway until it was demolished and re-routed in 1975.
Swing through truss bridge over Charles River on N. Washington Street in Boston
Open to traffic

Eleventh Street Bridge (Franklin County, Massachusetts)
Built 1915; rehabilitated 1996
Triple-barreled through truss bridge over Utility Canal on Eleventh Street in Montague
Open to traffic