06/22/2026
Did you know that the Quabbin Reservoir, which today supplies water for the city of Boston, was once the largest reservoir in the world that was intended only for drinking water? With a size of 39 square miles, this massive piece of water infrastructure has a maximum capacity of 412 billion gallons of water. How long does it take to fill a reservoir that size? Nearly 7 years! While construction began in 1927 and water began flowing into the reservoir in 1939, it wasn't until June 22, 1946, that the Quabbin Reservoir reached its full capacity and water was released over the Winsor Dam Spillway for the first time. While today, more than 40% of Massachusetts residents (that's nearly 3 million people) enjoy bountiful safe water from this crucial water source, it's important to remember the sacrifices made by the residents of the towns of Prescott, Dana, Enfield, and Greenwich, around 2,500 of whom lost their homes during the construction of the reservoir.