- 1 Who discovered Glacial Lake Missoula?
- 2 How many days did it take Glacial Lake Missoula to drain?
- 3 Where was the Glacial Lake Missoula ice dam?
- 4 Why does Lake Missoula no longer exist?
- 5 What is the biggest flood in history?
- 6 How long did Lake Agassiz exist?
- 7 How did Lake Bonneville disappear?
- 8 How many cubic miles was Glacial Lake Missoula?
- 9 What happened to Glacial Lake Missoula at the end of the last ice age?
- 10 How does a lake in Missoula MT relate to the Megafloods?
- 11 What was the biggest flood in Washington state?
- 12 When was the most recent ice age?
- 13 Why did the glacial floods form so many lakes?
Who discovered Glacial Lake Missoula?
Two geologists, J Harlen Bretz and Joseph T. Pardee, were instrumental in finding the solution to this geologic mystery. Bretz spent a great deal of his life studying the geologic landscape of eastern Washington.
How many days did it take Glacial Lake Missoula to drain?
The repeated filling and collapse of the ice dam would drain an inland sea the size of Lake Erie and Lake Ontario in two days. At its greatest extent, Glacial Lake Missoula stretched eastward a distance of some 200 miles. When the lake rose high enough, it burst through the ice dam.
Where was the Glacial Lake Missoula ice dam?
Glacial Lake Missoula: At the end of the last Ice Age, a finger of the Cordilleran ice sheet crept southward into the Idaho panhandle, forming a large ice dam that blocked the mouth of the Clark Fork River, creating a massive lake 2,000 feet deep and containing more than 500 cubic miles of water.
Why does Lake Missoula no longer exist?
Glacial Lake Missoula formed as the Cordilleran Ice Sheet dammed the Clark Fork River just as it entered Idaho. The rising water behind the glacial dam weakened it until water burst through in a catastrophic flood that raced across Idaho, Oregon, and Washington toward the Pacific Ocean.
What is the biggest flood in history?
The largest known meteorological flood—one caused by rainfall, as in the current Mississippi River flood—happened in 1953, when the Amazon River overflowed.
How long did Lake Agassiz exist?
The history of Lake Agassiz in North Dakota covers approximately 2,700 years, from 11,700 years ago until 9,000 years ago.
How did Lake Bonneville disappear?
As the Ice Age ended the climate became warmer and drier. With less rainfall and glacial melting to sustain Lake Bonneville, coupled with increased evaporation, the vast lake began to retreat. The current Great Salt Lake’s drainage area is roughly that of ancient Lake Bonneville.
How many cubic miles was Glacial Lake Missoula?
At its highest level Glacial Lake Missoula covered an area of about 3,000 square miles and contained an estimated 500 cubic miles of water—half the volume of present day Lake Michigan.
What happened to Glacial Lake Missoula at the end of the last ice age?
At the end of the last Ice Age, about 18,000 to 15,000 years ago, an ice dam in northern Idaho created Glacial Lake Missoula in Montana. The ice dam burst and released flood waters across Washington and down the Columbia River back flooding into Oregon before eventually reaching the Pacific Ocean.
How does a lake in Missoula MT relate to the Megafloods?
Water in the Clark Fork ponded up behind an enormous ice dam from a lobe of the Cordilleran Ice Sheet, and reached a maximum depth of 600 meters as Glacial Lake Missoula.
What was the biggest flood in Washington state?
The National Oceanic and Atmospheric Administration (NOAA) says 1942 holds the record, measured at the southwest waterfront, followed closely by the monster flood of 1936. Old news accounts agree. The 1942 flood was brought on by 5.4 inches of rain that fell in Washington over 77 hours in the third week of October.
When was the most recent ice age?
Striking during the time period known as the Pleistocene Epoch, this ice age started about 2.6 million years ago and lasted until roughly 11,000 years ago. Like all the others, the most recent ice age brought a series of glacial advances and retreats.
Why did the glacial floods form so many lakes?
When the dam broke, a towering mass of water and ice was released and swept across parts of Idaho, Washington, and Oregon on its way to the ocean. Over a period of years the glacier would advance, once again blocking the river, and the dam and the lake would form again.