The beginning of the story is hundreds of miles to the east, in the Montana town of Missoula. It was known as Lake Missoula and was an inland freshwater sea capable of holding more water than both Lake Ontario and Lake Erie put together.
Watch this Video to Know More About the Story of the Deadliest and Worst Flood Ever on Earth
The current valley and landform were produced by the flood, which affected the entire area. In comparison to this deluge from ancient times, floods today are minor.
