Molasses Disaster in Boston's North End

The Boston Molasses Disaster, also known as the Great Molasses Flood and the Great Boston Molasses Tragedy, occurred on January 15, 1919, in the North End neighborhood of Boston, Massachusetts in the United States. A large molasses tank burst, and a wave of molasses rushed through the streets at an estimated 35 mph (56 km/h), killing 21 and injuring 150. The event has entered local folklore, and residents claim that on hot summer days, the area still smells of molasses.

The disaster occurred at the Purity Distilling Company facility on January 15, 1919, an unusually warm day. At the time, molasses was the standard sweetener in the United States. Molasses can also be fermented to produce rum and ethyl alcohol, the active ingredient in other alcoholic beverages and a key component in the manufacturing of munitions at the time. The stored molasses was awaiting transfer to the Purity plant situated between Willow Street and what is now named Evereteze Way in Cambridge, Massachusetts.

Near Keany Square, at 529 Commercial Street, a huge molasses tank 50 ft (15 m) tall, 90 ft (27 m) in diameter and containing as much as 2,300,000 US gal (8,700,000 L) collapsed. Witnesses stated that as it collapsed, there was a loud rumbling sound like a machine gun as the rivets shot out of the tank, and that the ground shook as if a train were passing by.

The collapse unleashed an immense wave of molasses between 8 and 15 ft (2.5 to 4.5 m) high, moving at 35 mph (56 km/h), and exerting a pressure of 2 ton/ft² (200 kPa). The molasses wave was of sufficient force to break the girders of the adjacent Boston Elevated Railway's Atlantic Avenue structure and lift a train off the tracks. Nearby, buildings were swept off their foundations and crushed. Several blocks were flooded to a depth of 2 to 3 feet. As described by author Stephen Puleo,

Molasses, waist deep, covered the street and swirled and bubbled about the wreckage. Here and there struggled a form — whether it was animal...

Molasses disaster? Can molasses kill people?
Yes, a molasses tank in Boston exploded with great force and flooded the streets with a huge wave of molasses. It killed 21 people, crumpled the steel support of an elevated train, and knocked over a fire station.

Book review from the New Yorker

In January, 1919, a fifty-foot tank filled with molasses exploded, sending waves of viscous goo through waterfront Boston and killing twenty-one people. Were Italian anarchists to blame or was it negligence by the tank's owner, the United States Industrial Alcohol company? Such matters form the crux of Puleo's account, which is narrated with gusto (and sometimes too much gusto: one victim has molasses "clinging to his private parts, like an army of insects that just keep coming"). Molasses was a vital commodity at the time, used in rum manufacture (the tank was full to the brim to cash in on pre-Prohibition demand), and it had been important in the production of First World War munitions. Puleo overreaches in claiming the story of the flood as a "microcosm of America"—an almost obligatory conclusion in this sort of history—but his enthusiasm for a little-known catastrophe is infectious.