Great Molasses Flood

Great Molasses Flood
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Title	Great Molasses Flood
Date	January 15, 1919
Time	Approximately 12:30 p.m.
Location	Boston, Massachusetts, United States
Coordinates	42, 22, 06.6, N...
Cause	Structural failure of storage tank
Fatalities	21
Injuries	150
Property damage	$100 million (2024 est.)

Great Molasses Flood. On January 15, 1919, a massive storage tank ruptured in the North End neighborhood of Boston, releasing an estimated 2.3 million gallons of molasses. The resulting wave, reaching up to 25 feet high and traveling at 35 miles per hour, devastated the harborfront industrial area, killing 21 people and injuring 150. The disaster led to one of Massachusetts's first major class-action lawsuits and prompted significant changes in industrial regulation and engineering standards.

Background

In the early 20th century, Boston was a major industrial and shipping hub, with its waterfront crowded with factories and storage facilities. The Purity Distilling Company, a subsidiary of the United States Industrial Alcohol Company (USIA), operated a large molasses storage tank on Commercial Street to supply raw material for the production of industrial alcohol, a key component in munitions manufacturing during World War I. The tank, constructed hastily in 1915, was 50 feet tall and 90 feet in diameter, holding up to 2.5 million gallons. Residents of the adjacent North End, a densely populated immigrant neighborhood, had long reported leaks and strange groaning noises from the structure, which was painted a dark brown to disguise the constant seepage. The tank's construction and oversight were managed by Arthur Jell, a treasurer for USIA with no engineering background, and it was built without proper safety testing or adherence to the building codes of the era.

The disaster

At approximately 12:30 p.m. on January 15, 1919, the poorly constructed tank catastrophically failed. Witnesses reported a sound like machine gun fire as the rivets sheared, followed by a deep rumble as the structure exploded. A wall of molasses, propelled by the sudden release of pent-up pressure and the weight of the contents, surged through the streets. The wave, initially over 25 feet high, demolished the Boston Elevated Railway's Atlantic Avenue structure, flattened buildings housing the City of Boston's public works department, and swept several freight cars from the New York, New Haven and Hartford Railroad into the harbor. The viscous flood trapped horses, crushed buildings, and drowned or asphyxiated victims in the sticky syrup. First responders, including the Boston Police Department, the Boston Fire Department, and crews from the USS Nantucket stationed nearby, rushed to the scene but found rescue efforts hampered by the thick, clinging substance.

Aftermath and cleanup

The immediate aftermath was a scene of horrific devastation, with a sticky brown sludge up to three feet deep covering a several-block area. The City of Boston mobilized all available resources, with the Boston Red Cross and the Salvation Army setting up aid stations. Initial recovery of the dead and injured was grueling, as molasses filled the streets and basements. The Boston Harbor turned brown, and the smell of molasses lingered for weeks. Cleanup involved washing down the streets with saltwater from fireboats, sanding the residue, and took an estimated 80,000 man-hours over several weeks. The disaster caused an estimated $100 million in modern damages, destroying critical infrastructure and halting operations for numerous businesses along the Commercial Street waterfront.

Investigation and legal proceedings

In the wake of the tragedy, the Commonwealth of Massachusetts convened a formal inquiry, one of the first to heavily rely on expert scientific testimony. Investigators, including MIT engineer R. W. Sherman, concluded that the tank failed due to structural inadequacy, likely exacerbated by fatigue from temperature fluctuations; the day of the disaster was unseasonably warm following a cold spell. A landmark civil suit, *Dakin et al. v. United States Industrial Alcohol Company*, was filed on behalf of 119 victims and their families. The trial, presided over by Massachusetts Superior Court Judge Hugh W. Ogden, lasted six years and involved testimony from numerous experts, including Harvard University metallurgist Albert W. Brinckerhoff. In 1925, the court found USIA liable for negligent construction and maintenance, ordering the company to pay damages, a ruling that established important precedents for corporate accountability and professional engineering oversight.

Legacy

The disaster left a profound mark on Boston and the field of engineering. It directly influenced the passage of stricter construction and safety codes in Massachusetts and other states, mandating that plans be signed by a licensed professional engineer and subject to independent review. The event entered local folklore, with some residents claiming to still smell molasses on hot days. It is commemorated historically with a plaque near the site and has been the subject of numerous books, articles, and documentaries. The flood is often cited in engineering and law curricula as a seminal case study in the consequences of negligence, the importance of materials science, and the evolution of modern liability law.

Category:1919 in Massachusetts Category:Industrial accidents and incidents in the United States Category:History of Boston Category:1919 disasters in the United States