The only sign of this disaster that you'll find today is a small plaque that marks the location of the tank at 529 Commercial Street. The plaque is inlaid on the wall in front of the bocce courts. (Behind the bocce courts, by the way, is an old statue that used to be on Gallops Island in Boston Harbor honoring graduates the U.S. Maritime Service Radio Training Station.)
The plaque reads: "On January 15, 1919, a molasses tank at 529 Commercial Street exploded under pressure, killing 21 people. A 40-foot wave of molasses buckled the elevated railroad tracks, crushed buildings and inundated the neighborhood. Structural defects in the tank combined with unseasonably warm temperatures contributed to the disaster."