Qualla: Great Molasses Flood

Great Molasses Flood: Introduction

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit Public domain. The sound came first. Witnesses on Commercial Street in Boston's North End described it differently -- a deep growling, a thunderclap, the rumble of an elevated train, the staccato crack of a machine gun as steel rivets fired from a disintegrating tank like bullets. Then came the wave. At approximately 12:30 in the afternoon on January 15, 1919, a massive storage tank owned by the Purity Distilling Company burst open, releasing a wall of crude molasses that surged through the narrow streets of one of Boston's most densely populated neighborhoods. The wave killed 21 people, injured 150 more, and left several city blocks buried under a dark, viscous flood. Residents would report for decades afterward that on hot summer days, the North End still smelled of molasses.

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Image: Public domain

Great Molasses Flood: A Tank Built to Fail

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit Jacione, CC BY-SA 4.0. The tank was trouble from the day it was filled. Constructed in 1915 by the United States Industrial Alcohol Company, it stood fifty feet tall and ninety feet in diameter, capable of holding 2.3 million gallons of molasses -- raw material for industrial alcohol and munitions prod...

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Image: Jacione | CC BY-SA 4.0

Great Molasses Flood: Twelve-Thirty on a Wednesday

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit not specified, Public domain. The failure started at a manhole cover near the base of the tank, where a fatigue crack had grown to its breaking point. The ground shook. The tank's walls split apart and collapsed. What followed was not the slow ooze that the word "molasses" suggests. A 2016 Harvard University ...

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Image: not specified | Public domain

Great Molasses Flood: The Reckoning

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit MLHalsey, CC BY-SA 3.0. The disaster killed 21 people and injured 150. Among the dead were men, women, and children -- workers at the nearby paving company, passersby on the street, residents in their homes. The cleanup took weeks. City workers, soldiers from the USS Nantucket docked nearby, and Red Cro...

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Image: MLHalsey | CC BY-SA 3.0

Great Molasses Flood: The Laws That Followed

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit Volzja54501, CC BY-SA 4.0. The Great Molasses Flood did more than devastate a neighborhood. It transformed how America regulated industrial construction. In the direct aftermath, Massachusetts and other states enacted new requirements mandating that engineering plans be reviewed and stamped by a licensed a...

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Image: Volzja54501 | CC BY-SA 4.0

Great Molasses Flood: Where the Tank Once Stood

Sun, 22 Feb 2026 00:00:00 GMT

Photo credit The Bostonian Society, Public domain. United States Industrial Alcohol never rebuilt the tank. The site passed through several owners and eventually became a city-owned recreational complex now called Langone Park, featuring a Little League baseball field, a playground, and bocce courts. The concrete foundation slab ...

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Image: The Bostonian Society | Public domain