Jefferson Peak
Mt. Pershing (left) and Jefferson Peak (right) seen from West Seattle
Highest point
Elevation5,720 ft (1,743 m)[1]
Prominence600 ft (180 m)[2]
Parent peakMount Pershing (6,154 ft)[3]
Isolation1.30 mi (2.09 km)[3]
Coordinates47°33′41″N 123°13′55″W / 47.5613874°N 123.2319222°W / 47.5613874; -123.2319222[4]
Naming
EtymologyThomas Jefferson
Geography
Jefferson Peak is located in Washington (state)
Jefferson Peak
Jefferson Peak
Location of Jefferson Peak in Washington
Jefferson Peak is located in the United States
Jefferson Peak
Jefferson Peak
Jefferson Peak (the United States)
LocationMason County, Washington, US
Parent rangeOlympic Mountains
Topo mapUSGS Mount Washington
Geology
Age of rockEocene
Type of rockpillow basalt
Climbing
First ascent1958[2]
Easiest routeclass 3 scramble via Goober Pond[2]

Jefferson Peak is a 5,720-foot (1,740 m) mountain summit located in the Olympic Mountains in Mason County of Washington state.[4] It is situated in the Mount Skokomish Wilderness, on land managed by Olympic National Forest. The mountain's name honors Thomas Jefferson (1743–1826), the third president of the United States.[5] The nearest higher neighbor is line parent Mount Pershing, 1.3 mi (2.1 km) to the southwest.[6] Precipitation runoff drains into Jefferson Creek and the Hamma Hamma River. Topographic relief is significant as the north aspect rises over 4,100 feet (1,200 m) above the Hamma Hamma valley in approximately one mile.

Climbing

The first ascent of the summit was made in 1958 by Don Anderson, Bob Oram, Keith Spencer, and Robert Petersen.[2] There are three established scrambling routes to the summit: from Goober Pond, the North Couloir, and via the East Peak.[2] Jefferson Peak has a 250-foot-high (class 5.3) subpeak called "Tran Spire" (4,943 feet (1,507 m)) which was first climbed in 1958 by Don Anderson and Robert Petersen .[2][7]

Climate

Jefferson Peak is located in the marine west coast climate zone of western North America.[8] Most weather fronts originate in the Pacific Ocean, and travel northeast toward the Olympic Mountains. As fronts approach, they are forced upward by the peaks of the Olympic Range, causing them to drop their moisture in the form of rain or snowfall (Orographic lift). As a result, the Olympics experience high precipitation, especially during the winter months. During winter months, weather is usually cloudy, but due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer. Because of maritime influence, snow tends to be wet and heavy, resulting in avalanche danger. The months April through August offer the most favorable weather for viewing or climbing this mountain.[2]

Geology

The Olympic Mountains are composed of obducted clastic wedge material and oceanic crust, primarily Eocene sandstone, turbidite, and basaltic oceanic crust.[9] The mountains were sculpted during the Pleistocene era by erosion and glaciers advancing and retreating multiple times.

See also

References

  1. ↑ Olympic Mountain Rescue, Olympic Mountains: A Climbing Guide, 4th Edition, 2006, Mountaineers Books, ISBN 9780898862065, page 65.
  2. 1 2 3 4 5 6 7 Jefferson Peak (Thorson Peak), climbersguideolympics.com
  3. 1 2 "Jefferson Peak - 5,720' WA". listsofjohn.com. Archived from the original on 2022-02-11. Retrieved 2022-02-11.
  4. 1 2 "Jefferson Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2022-02-11.
  5. ↑ Kai Huschke (2003), Washington's Wilderness Areas, Westcliffe Publishers, ISBN 9781565794412, page 48.
  6. ↑ "Jefferson Peak, Washington". Peakbagger.com.
  7. ↑ "Tran Spire, Washington". Peakbagger.com.
  8. ↑ Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrol. Earth Syst. Sci. 11: 1633–1644. ISSN 1027-5606.
  9. ↑ Alt, D.D.; Hyndman, D.W. (1984). Roadside Geology of Washington. pp. 249–259. ISBN 0-87842-160-2.
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