- 1 Where was Glacial Lake Missoula?
- 2 How long did it take Lake Missoula to empty?
- 3 When did Lake Missoula form?
- 4 Why does Lake Missoula no longer exist?
- 5 How did Lake Bonneville disappear?
- 6 What is the largest flood in history?
- 7 What happened to Glacial Lake Missoula at the end of the last ice age?
- 8 How does a lake in Missoula MT relate to the Megafloods?
- 9 How long did Lake Agassiz exist?
- 10 How many cubic miles was Glacial Lake Missoula?
- 11 What evidence from Glacial Lake Missoula showed that the lake may have emptied suddenly?
- 12 Who was the first person to present the theory of the Lake Missoula Floods?
- 13 When was the most recent ice age?
Where was Glacial Lake Missoula?
Glacial Lake Missoula was a large prehistoric lake in Western Montana created by Ice Age flooding. Glacial Lake Missoula was a massive prehistoric lake in Western Montana created by the Cordilleran Ice Sheet creeping south, blocking and damming the Clark Fork River near present day Lake Pend Orielle.
How long did it take Lake Missoula to empty?
It is estimated that the maximum rate of flow was equal to 386 million cubic feet per second. At that rate, the lake probably drained in a few days.
When did Lake Missoula form?
During the most recent episode of major ice-sheet expansion, between about 18,000 and 13,000 years ago, a lobe of the Cordilleran ice sheet advanced into the Idaho Panhandle to the area that is now occupied by Lake Pend Oreille, thus blocking the Clark Fork River drainage and causing Glacial Lake Missoula to form.
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.
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.
What is the largest 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.
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.
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 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 evidence from Glacial Lake Missoula showed that the lake may have emptied suddenly?
The marks were evidence that the ice dam holding back the water had failed suddenly, and Glacial Lake Missoula had drained rapidly. The ripple marks are up to 50 feet high and 500 feet apart.
Who was the first person to present the theory of the Lake Missoula Floods?
In 1940, Pardee went public with his theory about Lake Missoula, stating his belief that the entire lake had drained catastrophically. In 1965, age 82, Bretz received a telegram of surrender from the remaining disbelieving geologists (many others were dead by now).
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.