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The Willamette Valley (/ w ɪ ˈ l æ m ɪ t / ⓘ wil-AM-it) is a 150-mile (240 km) long valley in Oregon, in the Pacific Northwest region of the United States. The Willamette River flows the entire length of the valley and is surrounded by mountains on three sides: the Cascade Range to the east, the Oregon Coast Range to the west, and the ...
The Willamette Valley ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency in the U.S. states of Oregon and Washington.Slightly larger than the Willamette Valley for which it is named, the ecoregion contains fluvial terraces and floodplains of the Willamette River system, scattered hills, buttes, and adjacent foothills.
Willamette Valley map showing main stem and major tributaries. The Willamette River drains a region of 11,478 square miles (29,730 km 2), which is 12 percent of the total area of Oregon. [4] Bounded by the Coast Range to the west and the Cascade Range to the east, the river basin is about 180 miles (290 km) long and 100 miles (160 km) wide. [13]
The Willamette River Valley. The climate of Willamette Valley is mild year-round. Winters are typically cool and wet, summers are dry and warm; heat above 90 °F (32 °C) only occurs 5 to 15 days per year, and the temperature drops below 0 °F (−18 °C) once every 25 years.
The level III ecoregions in Oregon are the Coast Range (1), Willamette Valley (3), Cascades (4), Eastern Cascades Slopes and Foothills (9), Columbia Plateau (10), Blue Mountains (11), Snake River Plain (12), Klamath Mountains (78), and Northern Basin and Range (80). (Compare to map of Level IV ecoregions.)
Aerial view of crossings in downtown Portland. This is a list of bridges and other crossings of the Willamette River in the U.S. state of Oregon from the Columbia River upstream to the confluence of the Middle Fork Willamette River and Coast Fork Willamette River.
The Willamette Falls is a natural waterfall in the northwestern United States, located on the Willamette River between Oregon City and West Linn, Oregon. The largest waterfall in the Northwest U.S. by volume, it is the seventeenth widest in the world. [ 1 ]
The Fraser River separates the Cascades from the Coast Mountains in Canada, [4] as does the Willamette Valley from the upper portion of the Oregon Coast Range. The highest volcanoes of the Cascades, known as the High Cascades, [5] dominate their surroundings, often standing twice the height of the nearby mountains. They often have a visual ...
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