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At midday on January 15, 1919, a 50-foot tank of molasses ruptured in Boston’s North End, releasing about 2.3 million gallons. The wave killed 21 people, injured 150 and damaged buildings and elevated rail infrastructure. The company first alleged sabotage, but a court-appointed auditor later found structural failure and negligence. The $628,000 damages figure is reported by the New England Historical Society, not stated in the City of Boston’s account of the ruling.
What happened in Boston’s North End?
The tank, built in 1915 by Purity Distilling Company, stored molasses brought by ship for onward transport to distilleries. It stood near the harbor, streets and elevated railway in a working neighborhood where residents and workers were going about their day. The City of Boston says the tank had a history of leaks; people collected molasses that seeped out, and the company painted the tank brown to conceal the leakage. The City’s historical account was updated October 30, 2025.
The Boston Post’s January 16, 1919 report, reproduced by Mass Moments, captured how little was known immediately after the rupture: “A 50-foot wave of molasses—2,300,000 gallons of it—released in some manner yet unexplained, from a giant tank, swept over Commercial street and its waterfront from Charter street to the southerly end of North End park yesterday afternoon.”
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How many people died, and what was damaged?
The City of Boston records 21 deaths and 150 injuries. It says the molasses wave traveled at about 35 miles per hour, knocked an elevated train off its tracks, crushed buildings and shifted a firehouse and other structures from their foundations. These are the City’s reported figures; accounts may describe the wave differently, so a precise height or speed should not be inferred beyond that attribution.
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The destruction also made rescue difficult. Boston police, cadets from the USS Nantucket and the Red Cross helped respond. Molasses trapped people and complicated access through damaged streets and buildings. For cleanup, crews pumped saltwater from the harbor to break down the sticky mass. The City of Boston’s account describes the response and cleanup.
Why did the tank rupture?
The cause was initially unexplained. The United States Industrial Alcohol Company alleged that anarchists had sabotaged the tank, but that was the company’s claim—not the later finding. In 1925, court-appointed auditor Hugh W. Ogden concluded that structural failure and inadequate attention to safety caused the disaster, assigning liability to the company. Mass Moments summarizes the report and the rejected sabotage theory in its account of Ogden’s findings.
The City of Boston says engineers later found the tank walls too thin for the heavy contents and vulnerable to cracking. Its account also describes a sudden temperature change and a large new shipment as contributing factors. The Massachusetts Secretary of the Commonwealth’s historical account says the tank was hurriedly built without engineering consultation or a water test, and that leaks and warnings went unaddressed. These accounts support a picture of deficient design and oversight, but do not establish a more precise scientific sequence for the tank’s failure.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat did the $628,000 damages figure mean?
The New England Historical Society reports that the company paid $628,000 in damages. That figure is from its account of the flood; the City of Boston’s account verifies the 1925 negligence ruling but does not state the payment total. The amount should therefore be attributed to the historical society rather than presented as a figure established by the City’s account of Ogden’s report.
What changed after the flood?
Massachusetts historical sources credit the disaster with contributing to tighter construction oversight and engineer-certification requirements. The City says later changes included signed and sealed engineering plans and building inspections. These accounts describe a regulatory legacy, not a single law or a nationwide change attributable solely to the flood. The state archive publication also notes early pain-and-suffering awards in the case. The Massachusetts archive’s overview discusses the legal and regulatory significance.
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- A graphic novel adaptation of the I Survived story of the Great Molasses Flood of 1919, a little-known but fascinating historical disasterFeatures vivid artwork and gripping storytelling that brings this unusual historical event to lifePerfect for history enthusiasts and fans of the I Survived graphic novel series
Further reading
The City of Boston recommends Stephen Puleo’s book Dark Tide: The Great Boston Molasses Flood of 1919 for a fuller account of the disaster and its aftermath.
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Rank #4
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