The Seven Geographic Regions of Washington State. The Six Geographic Regions of the Pacific Northwest. 1) Coastal 2) Western Lowlands 3) Western Cascade Mountains 4) Eastern Cascades Mountains 5) Columbia Basin 6) Okanogan Highlands 7) Palouse Hills. Coastal Region.
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The second subregion within the West-ern Lowlands contains three major river valleys:
1) Chehalis River
2) Cowlitz River
the Columbia River Gorge
Why are these regions not as populated?
the third subregion
The Willamette River Valley was the historic objective of thousands of early pioneers.
The Willamette River produced a broad fertile valley that is a prime agricultural region.
cities as Portland, Eugene,Salem, Springfield, Beaverton, Corvallis, Al-bany, Lake Oswego, Gresham.
elevation ranges from sea level to about 1,000 feet (305 m).
This region is physically unique because of its many river valleys and flood plains. Thus, the total precipitation is generally less.
Marine West Coast
The region receives slightly less precipitation than the Coastal Region.
The Western Lowlands lie in the rainshadow of the Coastal Range and Olympic Mountains.
precipitation is generally less than on the windward slopes
average annual rainfall ranges from 15 inches (38 cm) at Sequim,and Eugene.
100 inches (254 cm) in the western foothills of the Cascade Mountains
The region’s average is about 40 inches (100 cm) annually.
Winter temperatures range from 35°F to 55°F
summer temperatures generally range between 65°F and 85°F
The Western Lowlands economy is be-coming more industrialized.
vegetables, berries, flower bulbs, fruits, nuts, nursery plants and shrubs, some grains, dairy products, and beef.
Western Lowlands economy is be-coming more industrialized.
Western Lowlands economy is be-coming more industrialized transportation equipment, electronics, and high technology
Eastern and Western Cascade Mountains
Just east of the Western Lowlands, also lying along a north-south axis, are the Cascade Mountains.
They extend from southern British Columbia, Canada, through the states of Washington and Oregon and end in northern California.
a formidable physical, climatic, and transportation barrier.
averaging about 6,000 feet (1,800 m) in elevation with many volcanic peaks above 10,000 feet (3,000 m)
Cascade Range has only a few low mountain passes and only one major lowland, where the Columbia River cuts through the Columbia Gorge.
The Cascade Mountains are part of the Pacific Ocean’s “Ring of Fire.”
Tallest Mount Rainier 14,411
Smallest Mt. St. Helens 8,365 ft
these north-south mountains are a physical barrier to the region’s climate
West wet East dry
100 inches (250 cm) on the western slope and decreases to only 20 inches (50 cm) on the eastern slopes
Rainier set the world record with 1,224.5 inches (3,110.2 cm) or 102 feet of snow between February19, 1971, and February 18, 1972.
heavy annual snowfall provides the late spring and early summer river runoff, especially significant for those eastern slope rivers flowing through the semiarid regions of Washington and Oregon.
Due to great range in elevation have climates that are more moist and very mild. summer maximum temperatures are cooler, but the winter minimum temperatures are colder.
Difference in vegetation east vs. west
West dense evergreen coniferous forests Fir species
Animals birds, small animals, and big game animals, such as elk, black bear, cougar or mountain lion, mule deer,bighorn sheep, and mountain goats.
The Cascade Mountain Region is sparsely populated.
Mountains is owned or controlled by either the state or federal government.
The largest geographic region of the Pacific Northwest.
The region covers about 193,000 square miles
It is the world’s second largest lava plateau.
400 miles (640 km) from north to south and 500 miles (800 km) east to west
lies between the Cascade Mountains to the west, the Rocky Mountains to the east and north, and the Great Intermountain
The Columbia Plateau was constructed by as many as 55 different lava flows.
northern part Columbia Basin
the sub regions include:
the Waterville Plateau
the Quincy Basin
the Channeled Scablands
the Palouse Hills
the Kittitas Valley
the Yakima Valley
the Pasco Basin
The central parts of the Columbia Plateau are interrupted by the Seven Devils, Wallowa, and Blue mountain ranges.
On the Oregon side of the Columbia River is the Umatilla-Deschutes Plateau.
The southern and southeastern sections are dominated by the Harney High Lava Plains and the Upper Snake River Valley respectively.
arid to semiarid region characterized by hot, sunny summers and cold winters.
region is virtually surrounded by the Cascade and Rocky mountains. These mountain barriers have a drastic effect upon annual precipitation amounts received by the region
annual precipitation below 20 inches
Summer 100°F Winter below zero
sparse grassland and sagebrush-bunch grass
Wildlife we know
human inhabitants are un-evenly distributed over this huge area.
mixture of farming and manufacturing
a long growing season, and abundant irrigation water allow farmers to produce outstanding yields of wheat, bar-ley, oats, hops, alfalfa, corn, beans, apricots, potatoes, sugar beets, apples, pears, peaches, grapes, cherries, vegetables, and specialty crops. In addition, the dry grasslands are excellent grazing areas for cattle, sheep, horses, and other livestock.
Forms the northernmost subregion in eastern Washington.
It extends east of the Cascades across the northeastern portion of the state.
The Columbia and Spokane rivers form its southern boundary
very rugged and mountainous.
It includes the Okanogan Highlands, San Poil and Selkirk mountains, and a small portion of the Rockies.
Includes several peaks over 8,500 feet
The Columbia River divides this subregion into two parts.
The western portion includes the Methow, Okanogan, and San Poil rivers.
The eastern portion includes the Pend Oreille,Colville, and Spokane rivers..
Cold winters and warm summers.
Summers are warm with little precipitation
The higher elevations have a highland climate, and lower elevations are semiarid.
Forested with a variety of evergreen and deciduous trees
The undergrowth consists of brush and grasses
Valleys are covered with western larch, alder, ash, and maple trees.
The Palouse Hills extend south from the Spokane River to the Blue Mountains.
In southeastern Washington State
The rugged Blue Mountains
Dune shaped Palouse Hills
Are the major physical features in this sub region.
6,401 feet highest elevation
Largest river of the region, is the Snake.
A modified semiarid climate.
Receives more precipitation than other areas of eastern Washington.
Higher elevations of the Blue Mountains have a highland climate.
Winter tends to be very cold and windy.
Summers, are very hot and dry with little or no moisture after April.
Steppe grasses and sagebrush cover most of the sub region.
The trees only grow on the moist upper slopes of the Blue Mountains.
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