The Great Molasses Flood: A Twenty-Five-Foot Wave in Boston — Boston, 1919
On January 15th, 1919, on an unseasonably warm day in Boston’s North End, a steel storage tank containing more than two million gallons of molasses failed catastrophically. The tank had been leaking for years — the company that owned it painted it brown so the drips wouldn’t show, rather than fix it. When it finally gave way, the rivets shot out with enough force that men who had just returned from the trenches of the First World War mistook the sound for machine-gun fire.
What followed was a wave of molasses twenty-five feet high, moving at thirty-five miles an hour, through one of the most densely packed immigrant neighborhoods in America. It swept away buildings. It knocked a firehouse off its foundation. It tore a support beam out from under the elevated railway. And because molasses cools and thickens, it trapped the people and animals caught in it the way flypaper traps a fly — rescuers spent days afterward pulling victims from a substance that would not let them go.
Twenty-one people died. A hundred and fifty were injured. The six-year legal battle that followed would help invent, in the modern American sense, the idea that engineers could be held legally responsible for their calculations.
Host Shawn Spainhour takes you into the full story: the neighborhood the tank stood over, the company that ignored years of warning signs, the wave itself, and the courtroom fight that changed how an entire country thought about engineering accountability.
If you love history, true crime, or storytelling — or if you’re just looking for something to listen to on a long drive or drift off to sleep — this one is for you.
Strange Epochs is a weekly narrative history podcast hosted by Shawn Spainhour. Each episode takes one strange, true, documented moment from somewhere in the long span of human history and sits with it — slow, atmospheric, and built for deep listening. New episodes every Tuesday. If this is your first episode, there are twenty-seven more waiting for you.
Sources:
- Wikipedia contributors. Great Molasses Flood. Wikipedia, Wikimedia Foundation, 2024.
- Britannica editors. Great Molasses Flood. Encyclopaedia Britannica, updated 2026.
- History.com editors. Boston shocked by deadly molasses flood. A and E Television Networks, 2025.
- History.com editors. Why the Great Molasses Flood Was So Deadly. A and E Television Networks, 2025.
- Boston.com. There Was No Escape from the Wave: These Are the Twenty-One Victims of the Great Boston Molasses Flood. January, 2019.
- Boston.gov. One Hundred Years Ago Today: Molasses Crashes Through Boston’s North End. 2025.
- Puleo, Stephen. Dark Tide: The Great Boston Molasses Flood of 1919. Beacon Press, 2003.
- Chambers Associate. Boston Legal History: The Great Molasses Disaster. chambers-associate.com.
- Historians for History. The Great Molasses Flood of 1919. March, 2024.