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These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ...
The Columbia River (Upper Chinook: ... Bathymetric map of the mouth of the Columbia River. ... huge outpourings of flood basalt lava covered the Columbia River ...
The 1948 Columbia River flood (or Vanport Flood) was a regional flood that occurred in the Pacific Northwest of the United States and Canada. Large portions of the Columbia River watershed were impacted, including the Portland area, Eastern Washington, northeastern Oregon, Idaho Panhandle, northwestern Montana, and southeastern British Columbia.
The Columbia River Basalt Group (including the Steen and Picture Gorge basalts) extends over portions of four states. The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt provinces on Earth, covering over 210,000 km 2 (81,000 sq mi) mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. [1]
The largest flood is estimated to be the initial flood at 2,500 km 3 (600 cu mi), with subsequent floods occurring at roughly 20 to 80 year intervals. [4] Since Lake Columbia was impounded behind the Okanogan lobe, which rose to 1,300 meters (4,300 ft), this lobe effectively blocked the normal course of the Columbia River, blocking the Missoula ...
The 1996 Pacific Northwest floods were a series of floods in Washington, Oregon, and the Idaho Panhandle in the United States. Large portions of the Columbia River and Puget Sound watersheds were impacted, including the Portland, Yakima, and the Palouse region. The flood was largely caused by warm temperatures and heavy rain falling on ...
Tributaries and sub-tributaries are hierarchically listed in order from the mouth of the Columbia River upstream. Major dams and reservoir lakes are also noted. Map of the Columbia drainage Basin with the Columbia River highlighted and showing the major tributaries
The river flows through Canada and the United States. Almost all of these rapids are now submerged in the reservoirs of dams. The list is not exhaustive; there were numerous minor rapids and riffles, many of which were never named. Map of the Columbia drainage Basin with the Columbia River highlighted and showing the major tributaries