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Encyclopedia > Northern Oregon Coast Range
Northern Oregon Coast Range
Green Top mountain in Yamhill County.
Country United States
State Oregon
Part of Oregon Coast Range, Pacific Coast Ranges
Borders on Central Oregon Coast Range
Geology volcanic, forearc basin
Period Paleocene, Eocene
Orogeny Geologic fault, basalt flows
Length 100 mi (161 km), North-South
Highest point Rogers Peak
 - coordinates 45°40′11.1″N, 123°33′11.1″W
 - elevation 3,661 ft (1,116 m)

The Northern Oregon Coast Range is the northern section of the Oregon Coast Range located in the northwest portion of the state of Oregon, United States. This section of the mountain range, part of the Pacific Coast Ranges, contains peaks as high as 3706 feet (1130 m) for Rogers Peak.[1] Forests in these mountains are considered to be some of the most productive timber land in the world.[2] Yamhill County is a county located in the state of Oregon. ... Official language(s) None Capital Salem Largest city Portland Area  Ranked 9th  - Total 98,466 sq mi (255,026 km²)  - Width 260 miles (420 km)  - Length 360 miles (580 km)  - % water 2. ... The Pacific Coast Ranges are the series of mountain ranges that stretch along west coast of North America from Alaska to Mexico. ... This article is about volcanoes in geology. ... The Paleocene, early dawn of the recent, is a geologic epoch that lasted from 65. ... hfajhfiudshfas == == == --24. ... Geologic faults, fault lines or simply faults are planar rock fractures, which show evidence of relative movement. ... Basalt Basalt (IPA: ) is a common gray to black volcanic rock. ... A mile is a unit of length, usually used to measure distance, in a number of different systems, including Imperial units, United States customary units and Norwegian/Swedish mil. ... km redirects here. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... Official language(s) None Capital Salem Largest city Portland Area  Ranked 9th  - Total 98,466 sq mi (255,026 km²)  - Width 260 miles (420 km)  - Length 360 miles (580 km)  - % water 2. ... The Pacific Coast Ranges are the series of mountain ranges that stretch along west coast of North America from Alaska to Mexico. ...

Contents

Geology

The origins of these mountains began approximately 40 million years ago during the Eocene age. During this time-period, sandstone and siltstone formed in the area. Additionally, igneous rocks and basalt flows combined with basaltic sandstone to create many of the mountainous formations. Other sedimentary rock in the area formed more recently, around 20 million years ago. It is hypothesized that portions of the northern section of the range were islands during parts of the Eocene era.[3] Other portions of the mountains consist of marine sedimentary rock.[4] The entire coast range sits on a convergent tectonic margin interacting with the Juan de Fuca Plate that is subducting beneath North America tectonic plate.[5] Also, erosion of the region is a major factor in shaping the landscape. Heavy rainfall and landsides have worked to erode the mountains.[4] hfajhfiudshfas == == == --24. ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... Red sandstone interior of Lower Antelope Canyon, Arizona, worn smooth due to erosion by flash flooding over millions of years Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock grains. ... A map of the Juan de Fuca Plate The Juan de Fuca Plate, named after the explorer, is a tectonic plate arising from the Juan de Fuca Ridge, and subducting under the northerly portion of the western side of the North American Plate. ...


The range is part of a broad, plunging structural arch of sedimentary and Tertiary volcanic strata that is being uplifted. Eocene and Miocene sections form the flanks of the uplifted sections. Some of the oldest rocks are submarine tholeiitic basalts from the Eocene era. The basalt came from the basalt flows that covered much of Oregon and originated from volcanoes in the central portion of the state. Other rocks include sandstone, mudstone, and siltstone. It was during the middle Miocene period that the range was uplifted in the broad, northeast-plunging arch.[6] The Miocene Epoch is a period of time that extends from about 23. ... Basalt Basalt (IPA: ) is a common gray to black volcanic rock. ...


Flora and fauna

Logging in the mountains.
Oregon-grape.

Portions of the range are in the Siuslaw National Forest and Tillamook State Forest, and large sections of the range were burned in forest fires during the 1930s and 1940s as part of the Tillamook Burn. In the forested areas trees include Sitka spruce, western redcedar, Douglas-fir, and western hemlock.[7] Other plants that grow in the region are huckleberry, salmonberry, salal, vine maple, sword fern, Oregon grape, bracken fern, and thimble-berry to name a few.[7][8] Image File history File links Download high resolution version (1551x1053, 299 KB)photo by Meggar Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Image File history File links Download high resolution version (1551x1053, 299 KB)photo by Meggar Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Fire in San Bernardino, California Mountains (image taken from the International Space Station) A wildfire, also known as a forest fire, vegetation fire, grass fire, or bushfire (in Australasia), is an uncontrolled fire in wildland often caused by lightning; other common causes are human carelessness and arson. ... The Tillamook Burn was a series of forest fires in the Coast Range of Oregon in the United States that destroyed a total area of 355,000 acres (1,400 km&sup2) of old growth timber, as well as the location of these fires. ... Binomial name Mahonia aquifolium (Pursh) Nutt. ...


Insects found include millipedes, collembolans, spiders, beetles, slugs, and various centipedes.[7][8] Animals that inhabit the Northern Coast range are weevils, chipmunks, bears, rabbits, white-footed deer mice, Columbian Black tail deer, and others.[8] Birds include chickadees, red-breasted nuthatches, kinglets, Western pileated woodpeckers, Oregon gray jays, California creepers, and Sitka red crossbills among others.[8]


Location and climate

The range begins at the Columbia River, with some mountainous features on the north side of the river, and continues south roughly 100 miles to the Salmon River where Oregon Route 18 traverses the range from the Willamette Valley to the Oregon Coast. Width of the mountains varies, but are roughly 35 miles wide.[2] The Columbia River (French: fleuve Columbia) is a river situated in British Columbia and the Pacific Northwest of the United States. ... The Salmon River is a river, approximately 20 mi (32 km) long, on the Pacific coast of northwest Oregon in the United States. ... Oregon Route 18 is a state highway that runs between the Oregon Coast, near Lincoln City and the Willamette Valley, near Dayton. ... The Willamette Valley The Willamette Valley The Willamette Valley is the region in northwest Oregon in the United States that surrounds the Willamette River as it proceeds northward from its emergence from mountains near Eugene to its confluence with the Columbia River. ... Oregon coast at Brookings, Oregon. ...


Climate of the range is moderate due to marine influences. Annual precipitation varies from 60 to 180 inches.[9]


Peaks

All mountains over 3,000 feet in elevation in the Northern Coast Range.[10]

Mountain Name Elevation County
Rogers Peak 3,661 ft (1,116 m) Tillamook
South Saddle Mountain 3,438 ft (1,048 m) Washington
Larch Mountain 3,425 ft (1,044 m) Washington
Trask Mountain 3,412 ft (1,040 m) Yamhill
Saddle Mountain 3,291 ft (1,003 m) Clatsop
Triangulation Point 3,235 ft (986 m) Tillamook
Kings Mountain 3,192 ft (973 m) Tillamook
Mount Hebo 3,140 ft (957 m) Yamhill
Edwards Butte 3,136 ft (956 m) Tillamook
Buck Mountain 3,097 ft (944 m) Tillamook
Sheridan Peak 3,091 ft (942 m) Yamhill
Woods Point 3,084 ft (940 m) Tillamook
Gobblers Knob 3,058 ft (932 m) Tillamook

A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The metre (or meter, see spelling differences) is a measure of length. ...

Other peaks

Neahkahnie Mountain is a mountain on the Oregon Coast, north of Manzanita. ...

Rivers

Map of the region with major rivers in blue. Orange line shows divide between watersheds flowing to the east and those flowing north or west.

The following rivers have their headwaters in the Northern Oregon Coast Range:

The Columbia River (French: fleuve Columbia) is a river situated in British Columbia and the Pacific Northwest of the United States. ... The Clatskanie River is a tributary of the Columbia River, approximately 25 mi (40 km) long, in northwestern Oregon in the United States. ... The John Day River is a tributary of the Columbia River, approximately 15 mi (24 km) long, in northwestern Oregon in the United States. ... The Klaskanine River is a tributary of the Youngs River, approximately 16 mi (26 km) long, in northwest Oregon in the United States. ... The Lewis and Clark River is a tributary of the Columbia River, approximately 20 mi (32 km) long, in northwest Oregon in the United States. ... This article needs to be cleaned up to conform to a higher standard of quality. ... The Wallooskee River is a tributary of the Youngs River, approximately 6 mi (10 km) long, in northwest Oregon in the United States. ... Youngs River and Saddle Mountain (left) The Youngs River is a tributary of the Columbia River, approximately 20 mi (32 km) long, in northwest Oregon in the United States. ... The Willamette River (pronounced wil-LAM-met) is a tributary of the Columbia River, approximately 240 mi (386 km) long, in northwestern Oregon in the United States. ... The Tualatin River in northwest Oregon The Tualatin River is a tributary of the Willamette River, approximately 83 mi (125 km), in Oregon in the United States. ... The Yamhill River is a tributary of the Willamette River, approximately 12 mi (19 km) long, in northwestern Oregon in the United States. ... The Kilchis River is a river, approximately 15 mi (24 km) long, on the coast of northwest Oregon in the United States. ... The Miami River is a river, approximately 12 miles (19 km) long, on the coast of northwest Oregon in the United States. ... The Necanicum River is river on the Pacific coast of northwest Oregon in the United States, approximately 21 mi (34 km) long. ... The Nehalem River at Vernonia The Nehalem River is a river on the Pacific coast of northwest Oregon in the United States, approximately 115 mi (180 km) long. ... The Nestucca River is river, approximately 20 mi (32 km) long, on the Pacific coast of northwest Oregon in the United States. ... The Salmonberry River is a tributary of the Nehalem River, approximately 20 mi (32 km) long, in northwest Oregon in the United States. ... The Salmon River is a river, approximately 20 mi (32 km) long, on the Pacific coast of northwest Oregon in the United States. ... The Tillamook River is a river, approximately 12 mi (19 km) long, on the coast of northwest Oregon in the United States. ... The Trask River is a river, approximately 12 mi (19 km) long, in northwestern Oregon in the United States. ... The Wilson River is a river, approximately 20 mi (32 km) long, in the coast of northwest Oregon in the United States. ...

References

  1. ^ Peakbagger.com: Rogers Peak
  2. ^ a b Oregon State University: Northern Coast Range Adaptive Management Area; Chapter 2: Physical and Biological Environment
  3. ^ Oregon Department of Forestry: Upper Nehalem Watershed Analysis
  4. ^ a b An Erosional Classification for the Northern Oregon Coast, Annals of the Association of American Geographers, Vol. 54, No. 3. (Sep., 1964), pp. 329-335. John V. Byrne
  5. ^ Geology of the Luckiamute River Watershed, Upper Willamette Basin, Polk and Benton Counties, Oregon
  6. ^ USGS: Geologic Map of the Tillamook Highlands, Northwest Oregon Coast Range
  7. ^ a b c Tree Dictionary: From the Forest to the Sea: A Story of Fallen Trees
  8. ^ a b c d Biotic Aspection in the Coast Range Mountains of Northwestern Oregon, Ecological Monographs, Vol. 28, No. 1. (Jan., 1958), pp. 21-54. James A. Macnab.
  9. ^ Oregon Department of Forestry: Private Forests
  10. ^ USGS: GNIS

External links

 

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