Mount Hood reflected in Mirror Lake, Oregon

This article comprises three sortable tables of major mountain peaksThis article defines a significant summit as a summit with at least of

topographic prominence In topography, prominence (also referred to as autonomous height, relative height, and shoulder drop in US English, and drop or relative height in British English) measures the height of a mountain or hill's summit relative to the lowest contou ...

, and a major summit as a summit with at least of topographic prominence. All summits in this article have at least 500 meters of topographic prominence. An ultra-prominent summit is a summit with at least of topographic prominence. of the

U.S. The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...

State of Oregon. The

summit A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topography, topographic terms acme, apex, peak (mountain peak), and zenith are synonymous. The term (mountain top) is generally used ...

of a mountain or hill may be measured in three principal ways: #The topographic elevation of a summit measures the height of the summit above a geodetic sea level.All elevations in this article include an elevation adjustment from the

National Geodetic Vertical Datum of 1929 The National Geodetic Vertical Datum of 1929 is the official name since 1973 of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. Originally known as Sea Level Datum ...

( NGVD 29) to the

North American Vertical Datum of 1988 The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988. ...

( NAVD 88). For further information, please see this United States National Geodetic Surveybr>note
If the elevation or prominence of a summit is calculated as a range of values, the

arithmetic mean In mathematics and statistics, the arithmetic mean ( ) or arithmetic average, or just the ''mean'' or the ''average'' (when the context is clear), is the sum of a collection of numbers divided by the count of numbers in the collection. The colle ...

is shown. The first table below ranks the 30 highest major summits of Oregon by elevation. #The

of a summit is a measure of how high the summit rises above its surroundings.The

of a summit is the topographic elevation difference between the summit and its highest or key col to a higher summit. The summit may be near its key col or quite far away. The key col for

Denali Denali (; also known as Mount McKinley, its former official name) is the highest mountain peak in North America, with a summit elevation of above sea level. With a topographic prominence of and a topographic isolation of , Denali is the thir ...

Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...

is the Isthmus of Rivas in

Nicaragua Nicaragua (; ), officially the Republic of Nicaragua (), is the largest country in Central America, bordered by Honduras to the north, the Caribbean to the east, Costa Rica to the south, and the Pacific Ocean to the west. Managua is the cou ...

, away. The second table below ranks the 30 most prominent summits of Oregon. #The

topographic isolation The topographic isolation of a summit is the minimum distance to a point of equal elevation, representing a radius of dominance in which the peak is the highest point. It can be calculated for small hills and islands as well as for major mountain ...

(or radius of dominance) of a summit measures how far the summit lies from its nearest point of equal elevation.The

of a summit is the

great-circle distance The great-circle distance, orthodromic distance, or spherical distance is the distance along a great circle. It is the shortest distance between two points on the surface of a sphere, measured along the surface of the sphere (as opposed to a ...

to its nearest point of equal elevation. The third table below ranks the 30 most isolated major summits of Oregon. __TOC__

Highest major summits

Of the highest major summits of Oregon, five peaks exceed elevation and 28 peaks exceed elevation.

Most prominent summits

Of the most prominent summits of Oregon,

Mount Hood Mount Hood is a potentially active stratovolcano in the Cascade Volcanic Arc. It was formed by a subduction zone on the Pacific coast and rests in the Pacific Northwest region of the United States. It is located about east-southeast of Portlan ...

exceeds of

. Four peaks are ultra-prominent summits with more than of topographic prominence and 12 peaks exceed of topographic prominence.

Most isolated major summits

Of the most isolated major summits of Oregon, Sacajawea Peak and

Steens Mountain Steens Mountain is in the southeastern part of the U.S. state of Oregon, and is a large fault-block mountain. Located in Harney County, it stretches some north to south, and rises from the west side the Alvord Desert at elevation of about to a ...

exceed of topographic isolation and

Mount McLoughlin Mount McLoughlin is a dormant steep-sided stratovolcano, or composite volcano, in the Cascade Range of southern Oregon and within the United States Sky Lakes Wilderness. It is one of the volcanic peaks in the Cascade Volcanic Arc, within the Hi ...

exceeds of topographic isolation.

Gallery

Portland&MtHood.jpg,

Mt. Jefferson from Three Fingered Jack.JPG, Mount Jefferson Three sisters2.jpg, South Sister, Middle Sister, and North Sister Ice Lake, Sacajawea Peak.jpg, Sacajawea Peak Steens Mountain near Andrews, Oregon.jpg,

MtMcLoughlin.jpg,

Mt. Thielsen.jpg,

Mount Thielsen Mount Thielsen, or Big Cowhorn ( Klamath: hisc’akwaleeʔas), is an extinct shield volcano in the Oregon High Cascades, near Mount Bailey. Because eruptive activity ceased 250,000 years ago, glaciers have heavily eroded the volcano's st ...

Notes

References

External links

United States Geological Survey (USGS)

Geographic Names Information System @ USGSUnited States National Geodetic Survey (NGS)

Geodetic Glossary @ NGS

NGVD 29 to NAVD 88 online elevation converter @ NGS

Survey Marks and Datasheets @ NGSBivouac.comPeakbagger.comPeaklist.orgSummitpost.org
{{DEFAULTSORT:Mountain Peaks Of Oregon, List Of Lists of landforms of Oregon Oregon, List Of Mountain Peaks Of Oregon, List Of Mountain Peaks Of Oregon, List Of Mountain Peaks Of Oregon, List Of Mountain Peaks Of Oregon, List Of Mountain Peaks Of