In the early days of 1937, the Ohio River, swollen by heavy winter rains, began rising. And rising. And rising. By the time the waters crested, the Ohio and Mississippi had climbed to record heights. Nearly four hundred people had died, while a million more had run from their homes. The deluge caused more than half a billion dollars of damage at a time when the Great Depression still battered the nation. Timed to coincide with the flood's seventy-fifth...