Early one May morning in 1874, in the hills above Williamsburg, Massachusetts, a reservoir dam suddenly burst, sending an avalanche of water down a narrow river valley lined with factories and farms. In just thirty minutes, the Mill River flood left 139 people dead and 740 homeless -- and a nation wondering how this terrible calamity had happened.

In this compelling tale of a man-made disaster peopled with everyday heroes and arrogant scoundrels, Elizabeth Sharpe opens a rare window into industry and village life in nineteenth-century New England, a time when dam failures and other...