Hillman Peak
| Hillman Peak | |
|---|---|
 Southeast aspect | |
| Highest point | |
| Elevation | 8,151 ft (2,484 m)[1] |
| Prominence | 1,391 ft (424 m)[1] |
| Parent peak | Mount Scott(8,934 ft)[2] |
| Isolation | 8.01 mi (12.89 km)[2] |
| Coordinates | 42°57′07″N122°10′09″W/ 42.9518305°N 122.1692692°W[3] |
| Naming | |
| Etymology | John Wesley Hillman |
| Geography | |
  Hillman Peak Location in Oregon  Hillman Peak Hillman Peak (the United States) | |
| Country | United States of America |
| State | Oregon |
| County | Klamath |
| Protected area | Crater Lake National Park |
| Parent range | Cascades |
| Topo map | USGSCrater Lake West |
| Geology | |
| Age of rock | Pleistocene |
| Mountain type | Stratovolcano |
| Type of rock | andesite,breccia |
| Volcanic arc | Cascade Volcanic Arc |
| Last eruption | Pleistocene |
| Climbing | |
| Easiest route | class 3scrambling[2] |
Hillman Peakis an 8,151 feet (2,484 m)summiton the west rim ofCrater LakeinCrater Lake National Park,Oregon.[3]It is the highest peak on the caldera rim and ranks as the second-highest peak in the park.[4]It is situated 1.5 mile northwest ofWizard Island.Topographic reliefis significant as the summit rises 1,973 feet above the lake in 0.57 mile.Rim Drivetraverses the western slope of the peak. Precipitation runoff from the peak's east slope drains into Crater Lake whereas the west slope drains to theRogue RiverviaCopeland Creek.
History
[edit]Hillman Peak was named byWilliam Gladstone SteelforJohn Wesley Hillman(1832–1915), a prospector who discovered Crater Lake on June 12, 1853.[3]The peak's "Hillman Peak" toponym was officially adopted in 1928 by theUnited States Board on Geographic Names.[3]Variant names prior to 1928 included Glacier Peak and Maxwell Peak.
Climate
[edit]Based on theKöppen climate classification,Hillman Peak has asubalpine climate.[5]Mostweather frontsoriginate in the Pacific Ocean, and travel east toward the Cascades where they are forced upward by the range (Orographic lift), causing them to drop their moisture in the form of rain or snowfall. As a result, the Cascades experience high precipitation, especially during the winter months in the form of snowfall. Winter temperatures can drop below 10 °F (−12 °C) with wind chill factors below 0 °F (−18 °C). In the Crater Lake area, winter lasts eight months with an average snowfall of 41 feet (12.5 m) per year.[6]Rim Drive is only open during the summer due to the heavy snowfall as the road is covered by more than 20 feet (6.1 m) of snow with drifts as deep as 60 feet (18 m) in some areas.[7]During winter months, weather is usually cloudy, but due tohigh pressure systemsover the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer.
Geology
[edit]Hillman Peak was created whenMount Mazama,a largestratovolcanoerupted violently approximately 7,700 years ago and formed on thecalderarim. The peak is the remnant of aparasitic coneon the western flank ofMount Mazama,such that when the caldera formed, the eastern half of the Hillman cone disappeared. The peak is composed of lava flows containing pyroxene and hornblendeandesitesandbreccias.[4]Evidence suggests that the pre-eruption Hillman cone acted as acleaverwhich was never entirely covered by glacial ice.[8]
According to theGlobal Volcanism Program (GVP),Hillman Peak is classified as a subfeature stratovolcano of Mount Mazama.
See also
[edit]
Gallery
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Hillman Peak (center) and The Watchman (left)
References
[edit]- ^ab"Hillman Peak, Oregon".Peakbagger.Retrieved2023-01-28.
- ^abc"Hillman Peak - 8,151' OR".listsofjohn.Retrieved2023-01-28.
- ^abcd"Hillman Peak".Geographic Names Information System.United States Geological Survey,United States Department of the Interior.Retrieved2023-01-28.
- ^ab"The Hillman Cone, Craterlakeinstitute".Retrieved2023-01-28.
- ^Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification".Hydrol. Earth Syst. Sci.11.ISSN1027-5606.
- ^Crater Lake Climate, National Park Service, Retrieved 2023-01-23.
- ^"Facts and Figures",National Park Service, United States Department of Interior, Crater Lake, Oregon, November 2001.
- ^Ann G. Harris, Esther Tuttle, Sherwood D. Tuttle (2004),Geology of National Parks,Volume 1, Kendall/Hunt Publishing Company,ISBN9780787299705,p. 536.
External links
[edit]
- National Geodetic Survey Data Sheet
- Crater Lake National Park(National Park Service)
- Weather forecast:Hillman Peak