Sitting Bull Mountain

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Sitting Bull Mountain
Sitting Bull from Cloudy Pass.jpg
Sitting Bull Mountain seen from Cloudy Pass
Highest point
Elevation 7,759 ft (2,365 m) [1]
Prominence 599 ft (183 m) [1]
Parent peak Plummer Mountain 7870 ft [1]
Isolation 1.53 mi (2.46 km) [2]
Coordinates 48°13′39″N120°57′34″W / 48.227595°N 120.959499°W / 48.227595; -120.959499 [1]
Geography
USA Washington relief location map.jpg
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Sitting Bull Mountain
Location in Washington state
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Sitting Bull Mountain
Sitting Bull Mountain (the United States)
CountryUnited States
State Washington
County Snohomish / Chelan
Protected area Glacier Peak Wilderness
Parent range Cascade Range
Topo map USGS Suiattle Pass
Geology
Age of rock Cretaceous
Mountain type Metamorphic brown Gneiss
Climbing
First ascent 1921 party of The Mountaineers [3]
Easiest route Scrambling [3]
Sitting Bull Mountain and Dome Peak seen from Spider Gap Sitting Bull Mountain and Dome Peak.jpg
Sitting Bull Mountain and Dome Peak seen from Spider Gap

Sitting Bull Mountain is a 7,759-foot (2,365-metre) double summit mountain in the North Cascades of Washington state. The north summit is higher than the south peak (7680+ ft), and easier to climb (class 3 vs. class 4), however neither peak sees much climbing activity. [3] Sitting Bull Mountain is located 2.1 mi (3.4 km) northwest of Suiattle Pass in the heart of the Glacier Peak Wilderness. Its nearest higher peak is Plummer Mountain, 1.51 mi (2.43 km) to the south-southwest. [1] The mountain is situated on the crest of the Cascade Range, on the shared border of Snohomish County and Chelan County. Precipitation runoff from Sitting Bull Mountain drains east into Agnes Creek which is a tributary of the Stehekin River, or west into Canyon Creek which is a tributary of the Suiattle River.

Contents

Geology

Subduction and tectonic activity in the area began during the late cretaceous period, about 90  million years ago. The area was previously an oceanic environment, consisting mainly of sedimentary and volcanic rocks. [3] Extensive volcanic activity began to take place in the oligocene, about 35  million years ago. [4] However, mountain building in the area did not begin until the miocene, approximately 10  million years ago. [3] Sitting Bull Mountain is located in the Cloudy Pass batholith, an intrusive formation that was formed approximately 20  million years ago, during the early miocene. [3] Glacier Peak, a stratovolcano that is south of Sitting Bull Mountain, began forming in the mid-Pleistocene. [3] Due to Glacier Peak's proximity to Sitting Bull Mountain, volcanic ash is quite common in the area.

Throughout the ice age, the North Cascades were mostly covered in thick glaciers, extending to near Puget Sound. Glaciation was most prevalent approximately 18,000 years ago, and most valleys were ice-free by 12,000 years ago. [3] As a result, valleys in the area are deep and u-shaped, and mountains tend to be rocky, with steep slopes and narrow summits.

Climate

Sitting Bull Mountain is located in the marine west coast climate zone of western North America. [3] Most weather fronts originating in the Pacific Ocean travel northeast toward the Cascade Mountains. As fronts approach the North Cascades, they are forced upward by the peaks of the Cascade Range (orographic lift), causing them to drop their moisture in the form of rain or snowfall onto the Cascades. As a result, the west side of the North Cascades experiences high precipitation, especially during the winter months in the form of snowfall. [3] Because of maritime influence, snow tends to be wet and heavy, resulting in high avalanche danger. [3] 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. [3] Due to its temperate climate and proximity to the Pacific Ocean, areas west of the Cascade Crest very rarely experience temperatures below 0 °F (−18 °C) or above 80 °F (27 °C). [3] The months of July through September offer the most favorable weather for viewing or climbing this peak.

See also

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Tenpeak Mountain is an 8,312-foot (2,533-metre) mountain summit located in the Glacier Peak Wilderness of the North Cascades in Washington state. Tenpeak is situated on the crest of the Cascade Range, on the shared border of Snohomish County and Chelan County, also straddling the boundary between the Mount Baker-Snoqualmie National Forest and the Wenatchee National Forest. Its nearest higher neighbor is Luahna Peak, 2.5 mi (4.0 km) to the southeast. Topographic relief is significant since the northern aspect of the mountain rises 4,200 feet above the Suiattle Valley in approximately 1.5 mi (2.4 km). This mountain has small, unnamed, hanging glaciers in cirques surrounding the summit, and the terminus of the Honeycomb Glacier lies below the western base of the mountain. Precipitation runoff from the mountain and meltwater from the glaciers drains south into White River; or north into the Suiattle River. This mountain's descriptive name was suggested by The Mountaineers, and was officially adopted in 1918 by the U.S. Board on Geographic Names. The first ascent was made September 21, 1940, by Lloyd Anderson and Tom Campbell.

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<span class="mw-page-title-main">Helmet Butte</span> Mountain of Washington (state)

Helmet Butte is a 7,400-foot (2,256-metre) summit located in the Glacier Peak Wilderness of the North Cascades in Washington state.

References

  1. 1 2 3 4 5 "Sitting Bull Mountain, Washington". Peakbagger.com.
  2. "Sitting Bull Mountain - 7,759' WA". Lists of John. Retrieved 2021-03-01.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 Beckey, Fred W. Cascade Alpine Guide, Climbing and High Routes. Seattle, WA: Mountaineers Books, 2008.
  4. "North Cascades Geology". United States Geological Survey . Retrieved July 29, 2013.