CogKnoSys

Knowledge you can walk. Read the idea below, then step up to the general, across to peers or down to the specific.

Physical

Lower Columbia Region

The lands along the lower Columbia River, from the Gorge through Portland and Vancouver to Longview and Kelso.

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The idea

The Lower Columbia Region is the stretch of the Columbia River valley around Portland and Vancouver. Its eastern end is the Columbia River Gorge, a canyon up to 4,000 feet (1,200 m) deep. The Gorge stretches for over eighty miles (130 km) as the river winds westward through the Cascade Range, and it is the only navigable route through those mountains. Through the region, the river itself forms the border between Washington and Oregon.

At the center is the Portland metropolitan area, which has its core in Oregon and Washington and whose largest city is Portland. Its official definition takes in Clark and Skamania counties in Washington and, in Oregon, Multnomah County and Columbia County, whose county seat, St. Helens, lies downstream on the river. Farther downstream, Cowlitz County, Washington, forms its own metropolitan area around Longview, its largest city, while Kelso is its county seat.

People have lived here for a very long time. The Gorge has supported human habitation for over 13,000 years, and the river has been used for transportation since ancient times. Salmon and other fish provided the core food supply for native peoples. Since the late 19th century, the river has been heavily developed with locks and dredged shipping channels. Since the early 20th century, dams have been built across it for power, navigation, irrigation and flood control.

Check yourself

Question 1 of 2

Which part of the region is the only navigable route through the Cascade Range?

Pick one. The first pick counts.

Composition

what it's made of

  • Columbia River Gorge — The deep canyon through the Cascade Range at the region's eastern end.
  • Portland metropolitan area — The urban core, centered on Portland and spanning Oregon and Washington.
  • Columbia County, Oregon — Part of the Portland metropolitan area, downstream along the river, with its county seat at St. Helens.
  • Cowlitz County, Washington — A Washington county whose county seat is Kelso and whose largest city is Longview.
  • The Columbia River — The river that ties the region together and forms the border between Washington and Oregon.

Connection

how it relates

Under Physical

Cause and effect

  1. Climate Patternsstrength 60 of 100

    In the Gorge, rainfall drops from about 100 inches to 10 inches in 80 miles, showing how mountains shape climate.

Related

  1. Ecosystemsstrength 60 of 100

    The Gorge holds a diverse collection of ecosystems, from temperate rain forest in the west to grasslands in the east.

  2. Electrical Energystrength 50 of 100

    In 2012 dams on the Columbia and its tributaries supplied 44 percent of all U.S. hydroelectric generation.

  3. Igneous Rockstrength 40 of 100

    Floods at the end of the last ice age cut the Gorge's steep walls and left many layers of volcanic rock exposed.

Change

how and why it evolves

Past
In 1805 the Lewis and Clark Expedition used the Gorge route on its way west, and in the following decades fur-trading companies used the Columbia as a key transportation route.
Now
The Portland metropolitan area had 2,512,859 people at the 2020 census, and since 1986 the Gorge has been protected as a National Scenic Area created by Congress.
Next
Growth in the metro area, the health of salmon runs and the management of dams will likely shape the region's future.

Knowledge you can walk. Read the idea, then step up, across or down.

Lower Columbia Region

The lands along the lower Columbia River, from the Gorge through Portland and Vancouver to Longview and Kelso.

Learn, discuss, create, buy or invest

The idea

The Lower Columbia Region is the stretch of the Columbia River valley around Portland and Vancouver. Its eastern end is the Columbia River Gorge, a canyon up to 4,000 feet (1,200 m) deep. The Gorge stretches for over eighty miles (130 km) as the river winds westward through the Cascade Range, and it is the only navigable route through those mountains. Through the region, the river itself forms the border between Washington and Oregon.

At the center is the Portland metropolitan area, which has its core in Oregon and Washington and whose largest city is Portland. Its official definition takes in Clark and Skamania counties in Washington and, in Oregon, Multnomah County and Columbia County, whose county seat, St. Helens, lies downstream on the river. Farther downstream, Cowlitz County, Washington, forms its own metropolitan area around Longview, its largest city, while Kelso is its county seat.

People have lived here for a very long time. The Gorge has supported human habitation for over 13,000 years, and the river has been used for transportation since ancient times. Salmon and other fish provided the core food supply for native peoples. Since the late 19th century, the river has been heavily developed with locks and dredged shipping channels. Since the early 20th century, dams have been built across it for power, navigation, irrigation and flood control.

Check yourself

2 quick questions, instant feedback.