England has been flooded lately. This late fall and the last week of the year 2023 saw record rainfalls in a nation known for being, well, wet. Only this week, the beginning of the tunnel connecting Britain to Europe by train was flooded out, and I have had floods from these rains cause the cancellation of some train travel due to inundated railroad tracks. Sometimes, the flooding causes deaths, but Britain has been exceptionally lucky in this area.
Boston, in 1919, saw a localized flood that killed over 20 people and severely injured dozens.
In this case, however, the cause of the 1919 Boston flood wasn’t rain. Instead, the flood was caused by a reservoir bursting. The Purity Company made products that required large storage tanks for manufacturing. In this particular case, Purity’s holding tanks were over 50 feet tall (15m) and had a circumference of 90 feet. I’ll save you the trouble of doing the math to tell you that the capacity of the tank was 2,3 million gallons or 8,700 cubic meters. The facility was located in the north end of Boston, quite near and convenient to the docks. However, when the tank ruptured and the flood happened, the crowded buildings in the neighborhood funneled the flood through the narrow local streets at a speed of over 35mph (55km/hr). That’s why so much destruction was caused and so many people were either killed or wounded.
Today, science can explain what happened that January day over 100 years ago. As temperatures rose to above freezing and more liquid was added to the tank, the warmer liquid that was added to the tank that day caused the existing liquid in the tank to expand, and that caused the almost explosive rupture of the tank. People who later gave their eyewitness testimony to both the police inquiry and to the local papers described a low, almost growling rumble that first produced what sounded like machine gunfire as the rivets of the metal tank started shooting off the sides. Then, those who were there spoke of a thunderous, explosive burst as the tank tore itself apart from the pressure of the rising temperatures.
As a result, a wave over 20 feet tall swooped through the canyons between the buildings. Everything in the path of this mini-tsunami was wiped out–people, wagons, storefronts, horses–everything. Even some smaller buildings were swept off their moorings. A streetcar was toppled in the wave. And, after the initial wave hit, the rescue efforts were thwarted by the 3+ feet of standing liquid that kept first responders from the scene. Several people who survived the initial flooding died because they became trapped by the liquid and drowned in it. Some of the first help to arrive came from a local naval training ground. The cadets there rushed in as quickly as they could and assisted those trapped by the flood. These cadets were the heroes of the day for many.
The oldest victim that day was 78, a messenger who came out of retirement to work part-time. The youngest was a 10 year old schoolgirl. The Purity Company was found responsible for the flood, and they had to pay out millions in compensation. The flood destroyed much of the factory, of course, and today, nice ballfields occupy the site where the storage tank once stood. In between two of the play areas, a nice plaque remembers the day of the flood and memorializes those killed and wounded by it.
Oh, by the way, local legend says that the smell from the flood stayed in Boston well into the summer. Even the harbor’s color was changed by the flood. You see, apparently, it’s simply quite difficult to remove both the color and the smell of that much molasses.


