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The Columbia River is the only river on the West Coast (and arguably the entire North American Pacific coast) that is navigable for a significant length. The river is regularly dredged, and freight barges may reach as far inland as Lewiston, Idaho , through a system of locks; however, there are strict draft restrictions beyond the confluence ...
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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
Columbia River, Cascade Mountains, Oregon, (1876) by Vincent Colyer (oil on canvas). Beacon Rock is visible on the left. Detail from the Lewis and Clark Expedition map. The Willamette River is shown as the "Multnomah", while the Snake River is "Lewis's River". (See complete map.)
David Thompson navigated the entire length of the Columbia River in 1811. This map of the Columbia and its tributaries shows modern political boundaries. After the general meeting in 1806, Thompson travelled to Rocky Mountain House and prepared for an expedition to follow the Columbia River to the Pacific Ocean.
The Columbia Basin Restoration Initiative was hailed as a “historic” step toward ending the status quo and making real progress on restoring dwindling salmon populations in the Northwest.
Columbia River Basin. Wallula Gap (/ w ə ˈ l uː l ə /) is a large water gap of the Columbia River in the Northwestern United States, in Southeastern Washington.It cuts through the Horse Heaven Hills basalt anticlines in the Columbia River Basin, just south of the confluence of the Walla Walla and Columbia rivers.
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