---
layout: post
title:  Columbia River
date:   2016-11-26 19:16:49 +0100
categories: wikipedia
---

_From Wikipedia, the free encyclopedia_

The **Columbia River** is the largest river in the [Pacific Northwest] region of North America.[\[9\]] The river rises in the [Rocky Mountains] of [British Columbia], Canada. It flows northwest and then south into the US state of [Washington], then turns west to form most of the border between Washington and the state of [Oregon] before emptying into the Pacific Ocean. The river is 1,243 miles (2,000 km) long, and its largest [tributary] is the [Snake River]. Its [drainage basin] is roughly the size of France and extends into seven US states and a Canadian province.

By volume, the Columbia is the fourth-largest river in the United States; it has the greatest flow of any North American river draining into the Pacific. The river’s heavy flow and relatively steep [gradient] gives it tremendous potential for the generation of electricity. The [14 hydroelectric dams] on the Columbia’s [main stem] and many more on its tributaries produce more than 44% of total U.S. [hydroelectric generation][\[10\]] – much more hydroelectric power than those of any other North American river.

The Columbia and its tributaries have been central to the region’s culture and economy for thousands of years. They have been used for transportation since ancient times, linking the many cultural groups of the region. The river system hosts many species of anadromous fish, which migrate between freshwater habitats and the [saline] waters of the Pacific Ocean. These fish—especially the [salmon] species—provided the core subsistence for native peoples; in past centuries, Indigenous peoples traveled across western North America to the Columbia to trade for fish.

In the late 18th century, a private American ship became the first non-indigenous vessel to enter the river; it was followed by a British explorer, who navigated past the [Oregon Coast Range] into the [Willamette Valley]. In the following decades, [fur trading] companies used the Columbia as a key transportation route. Overland explorers entered the Willamette Valley through the scenic but treacherous [Columbia River Gorge], and pioneers began to settle the valley in increasing numbers, following both routes to enter it. [Steamships] along the river linked communities and facilitated trade; the arrival of railroads in the late 19th century, many running along the river, supplemented these links.

  [Oregon Coast Range]: /wiki/Oregon_Coast_Range "Oregon Coast Range"
  [Willamette Valley]: /wiki/Willamette_Valley "Willamette Valley"
  [fur trading]: /wiki/Fur_trade "Fur trade"
  [Columbia River Gorge]: /wiki/Columbia_River_Gorge "Columbia River Gorge"
  [Steamships]: /wiki/Steamship "Steamship"

  [saline]: /wiki/Saline_water "Saline water"
  [salmon]: /wiki/Salmon "Salmon"

  [gradient]: /wiki/Grade_(slope) "Grade (slope)"
  [14 hydroelectric dams]: /wiki/List_of_dams_in_the_Columbia_River_watershed "List of dams in the Columbia River watershed"
  [main stem]: /wiki/Main_stem "Main stem"
  [hydroelectric generation]: /wiki/Hydroelectricity "Hydroelectricity"
  [\[10\]]: #cite_note-IEA2014-10

  [Pacific Northwest]: /wiki/Pacific_Northwest "Pacific Northwest"
  [\[9\]]: #cite_note-9
  [Rocky Mountains]: /wiki/Rocky_Mountains "Rocky Mountains"
  [British Columbia]: /wiki/British_Columbia "British Columbia"
  [Washington]: /wiki/Washington_(state) "Washington (state)"
  [Oregon]: /wiki/Oregon "Oregon"
  [tributary]: /wiki/Tributary "Tributary"
  [Snake River]: /wiki/Snake_River "Snake River"
  [drainage basin]: /wiki/Drainage_basin "Drainage basin"