The Great Dayton Flood, when the overflowing Great Miami River inundated Ohio, began on the 21st of March, 1913.
Over the course of the next few days, an estimated 360 people died, making the flood the worst natural disaster in the state’s history.
In addition to the destruction caused by the water, a gas explosion and exposed gas lines resulted in fires that caused significant damage. The damage to property included the loss of around 20 000 homes.
Despite being a historically significant city, because of the flood today there are few historic buildings left in Dayton.