The incredible story of a flood of near-biblical proportions --- its destruction, its heroes and victims, and how it shaped America's natural-disaster policies for the next century.

The storm began March 23, 1913, with a series of tornadoes that killed 150 people and injured 400. Then the freezing rains started and the flooding began. It continued for days. Some people drowned in their attics, others on the roads when the tried to flee.

It was the nation's most widespread flood ever --- more than 700 people died, hundreds of thousands of homes and buildings were destroyed, and millions were left homeless.