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The Missoula floods (also known as the Spokane floods, the Bretz floods, or Bretz's floods) were cataclysmic glacial lake outburst floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age. These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork ...
The Ice Age Floods National Geologic Trail is a network of routes connecting natural sites and facilities that provide interpretation of the geological consequences of the Glacial Lake Missoula floods of the last glacial period that occurred about 18,000 to 15,000 years ago. It includes sites in Washington, Oregon, Idaho, and Montana.
The Bonneville flood was a catastrophic flooding event in the last ice age, which involved massive amounts of water inundating parts of southern Idaho and eastern Washington along the course of the Snake River. Unlike the Missoula Floods, which also occurred during the same period in the Pacific Northwest, the Bonneville flood happened only once.
Outburst flood. In geomorphology, an outburst flood —a type of megaflood —is a high-magnitude, low-frequency catastrophic flood involving the sudden release of a large quantity of water. [1][2] During the last deglaciation, numerous glacial lake outburst floods were caused by the collapse of either ice sheets or glaciers that formed the ...
Surface area. 3,000 sq mi (7,800 km 2) [2] Average depth. 200 ft (61 m) [2] Max. depth. 400 ft (120 m) [2] Lake Allison was a temporary lake in the Willamette Valley of Oregon, formed periodically by the Missoula Floods from 15,000 to 13,000 BC. The lake is the main cause of the rich and fertile soil that now characterizes the Willamette Valley.
The event will be at 6 p.m. Sept. 19 at the library, 118 N. Columbia St. Ice Age Floods Institute Chapter President Lloyd Stoess will present his lecture "Course Changes of Inland Northwest Rivers ...
ISBN 978-1-879628-27-4. Sediment deposited by the lake with a hammer for scale. Lake Missoula was a prehistoric proglacial lake in western Montana that existed periodically at the end of the last ice age between 15,000 and 13,000 years ago. The lake measured about 7,770 square kilometres (3,000 sq mi) and contained about 2,100 cubic kilometres ...
The park is also a notable site along the National Ice Age Floods Geologic Trail. The Ice Age Floods Institute regularly offers field trips, hikes and presentations, providing opportunities for ...