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Tenmile Lake is named after the creek, which is about 10 miles (16 km) south of Winchester Bay. This community, at the mouth of the Umpqua River, was the earliest pioneer village along this part of the coast. Although the lake's official name is Tenmile Lake, it was formerly called Johnson Lake and South Tenmile Lake. [4]
As with the Oregon Coast Range as a whole, the Southern Oregon Coast Range likely began as an ocean island chain that collided with the continental tectonic plate of North America more than 60 million years ago. [2] In the Southern Range the 64-million-year-old Roseburg Volcanics that formed this section are the oldest portions of the entire ...
200 mi (320 km) North–South: Geography; Country: United States: State: Oregon: Subdivisions: Northern Oregon Coast Range, Central Oregon Coast Range and Southern Oregon Coast Range: Parent range: Pacific Coast Ranges: Borders on: Willamette Valley and Klamath Mountains (California Coast Ranges) Geology; Age of rock: Paleocene and Eocene: Type ...
The Cascade Volcanic arc is located approximately 100 km inland from the coast, and forms a north-to-south chain of peaks that average over 3,000 m (10,000 ft) in elevation. [3] The major peaks from south to north include: Lassen Peak and Mount Shasta (California) Crater Lake (Mazama), Three Sisters, Mount Jefferson, Mount Hood (Oregon)
Oregon (/ ˈ ɒr ɪ ɡ ən,-ɡ ɒ n / ⓘ ORR-ih-ghən, -gon) [7] [8] is a state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho.
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]
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