- 1 Where was the Glacial Lake Missoula ice dam?
- 2 How many days did it take Glacial Lake Missoula to drain?
- 3 Who discovered Glacial Lake Missoula?
- 4 How did the Missoula Floods occur?
- 5 Why does Lake Missoula no longer exist?
- 6 How many times did Lake Missoula Flood?
- 7 What is the biggest flood in history?
- 8 How long did Lake Agassiz exist?
- 9 What happened to Glacial Lake Missoula at the end of the last ice age?
- 10 When did the last ice age end?
- 11 When was the most recent ice age?
- 12 How does a lake in Missoula MT relate to the Megafloods?
- 13 How did glaciers contribute to the Missoula flood?
- 14 What was the biggest flood in Washington state?
- 15 What is a cataclysmic flood?
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.
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.
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 did the Missoula Floods occur?
About 15,000 years ago, in the waning millennia of the Ice Age, a vast lake known as Glacial Lake Missoula suddenly burst through the ice dam that plugged it at one end.
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 many times did Lake Missoula Flood?
It was the largest ice-dammed lake known to have occurred. The periodic rupturing of the ice dam resulted in the Missoula Floods – cataclysmic floods that swept across eastern Washington and down the Columbia River Gorge approximately 40 times during a 2,000 year period.
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.
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.
When did the last ice age end?
The last glacial period began about 100,000 years ago and lasted until 25,000 years ago. Today we are in a warm interglacial period.
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.
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 did glaciers contribute to the Missoula flood?
Glacial Lake Missoula was a body of water as large as some of the USA’s Great Lakes. This lake formed from glacial meltwater that was dammed by a lobe of the Canadian ice sheet. Eventually, the ice receded northward far enough that the dam did not reform, and the flooding episodes ceased.
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.
What is a cataclysmic flood?
Ancient Cataclysmic Floods were the Ice Age Floods that left erosional and depositional features and preceded the Missoula Floods (15-18,000 ka) in the Pacific Northwest of the United States (Allen et al., 2009). Calcrete paleosols at sites with evidence for older floods were all analyzed.