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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 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.)
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 ...
A map of the counties of Oregon with the cities of Salem and Portland. Oregon's population is largely concentrated in the Willamette Valley, which stretches from Eugene in the south (home of the University of Oregon) through Corvallis (home of Oregon State University) and Salem (the capital) to Portland (Oregon's largest city). [46]
Map of the Willamette National Forest. The Willamette National Forest is a National Forest located in the central portion of the Cascade Range of the U.S. state of Oregon. [4] It comprises 1,678,031 acres (6,790.75 km 2). Over 380,000 acres (694 mi 2, 1,540 km 2) are designated wilderness which include seven major mountain peaks.
From West Linn to Oregon City, I-205 and Willamette Falls Drive run roughly parallel to the river to its left. About 1 mile (2 km) later, Canemah, a neighborhood of Oregon City, is on the right and Tanner Creek enters from the left as the river approaches Willamette Falls. [6] [9] [17]
Several Oregon Trail branches and route variations led to the Willamette Valley. The most popular was the Barlow Road, which was carved through the forest around Mount Hood from The Dalles in 1846 as a toll road at $5.00 per wagon and 10 cents per head of livestock. It was rough and steep with poor grass but still cheaper and safer than ...