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Where is the Columbia River in Portland Oregon?

Portland, Oregon, is located on the Willamette River, approximately 10 miles upstream from the Willamette's confluence with the Columbia River.

What is the history of the Columbia River?

Numerous Native American peoples inhabited the Columbia River basin for several thousand years. Spanish explorers sailing up the Pacific coast about 1775 probably were the first Europeans to sight the river’s mouth. The Boston trader Robert Gray sailed up the Columbia in 1792 and named it for his ship.

What is the geology of Columbia River?

Columbia River - Geology. Geology. See also: Geology of the Pacific Northwest and Missoula Floods. When the rifting of Pangea, due to the process of plate tectonics, pushed North America away from Europe and Africa and into the Panthalassic Ocean (ancestor to the modern Pacific Ocean), the Pacific Northwest was not part of the continent.


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