Sinister Peak

Sinister Peak (8,440+ ft (2,570+ m)) is in Mount Baker-Snoqualmie and Wenatchee National Forests in the U.S. state of Washington.[3] It is situated in Glacier Peak Wilderness and the North Cascades. Not quite 1 mi (1.6 km) east of Dome Peak, Sinister Peak is along a high ridge connecting the two peaks. The Chickamin Glacier is on the north slopes of Sinister Peak while the Garden Glacier is just southeast. Though some of the routes to the summit are technical, it can be reached by a moderate scramble.[2]

Sinister Peak
Sinister Peak from Maple Pass area
Highest point
Elevation8,440+ ft (2,570+ m) [1]
Prominence840 ft (260 m) [1]
Coordinates48°18′00″N 121°00′35″W [1]
Geography
Sinister Peak
Location in Washington
Sinister Peak
Location in the United States
LocationChelan and Skagit County, Washington, U.S.
Parent rangeCascade Range
Topo mapUSGS Dome Peak
Climbing
First ascentLloyd Anderson, Jim Crooks, Clint Kelley, May 29, 1939[2]
Easiest routeclass 3

Climate

Sinister Peak is located in the marine west coast climate zone of western North America.[4] Most weather fronts originate in the Pacific Ocean, and travel northeast toward the Cascade Mountains. As fronts approach the North Cascades, they are forced upward by the peaks of the Cascade Range, causing them to drop their moisture in the form of rain or snowfall onto the Cascades (Orographic lift). As a result, the west side of the North Cascades experiences high precipitation, especially during the winter months in the form of snowfall. 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.[4]

Geology

The North Cascades features some of the most rugged topography in the Cascade Range with craggy peaks and ridges, deep glacial valleys, and granite spires. Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to various climate differences.

The history of the formation of the Cascade Mountains dates back millions of years ago to the late Eocene Epoch.[5] With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity persisted.[5] In addition, small fragments of the oceanic and continental lithosphere called terranes created the North Cascades about 50 million years ago.[5]

During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured the landscape leaving deposits of rock debris.[5] The U-shaped cross section of the river valleys are a result of recent glaciation. Uplift and faulting in combination with glaciation have been the dominant processes which have created the tall peaks and deep valleys of the North Cascades area.

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References
  1. "Sinister Peak, Washington". Peakbagger.com. Retrieved March 10, 2013.
  2. Beckey, Fred (2003). Cascade Alpine Guide, Vol. 2; Stevens Pass to Rainy Pass. Mountaineer Books. p. 246. ISBN 978-0-89886-838-8.
  3. Dome Peak, WA (Map). TopoQwest (United States Geological Survey Maps). Retrieved March 10, 2013.
  4. Beckey, Fred W. Cascade Alpine Guide, Climbing and High Routes. Seattle, WA: Mountaineers Books, 2008.
  5. Kruckeberg, Arthur (1991). The Natural History of Puget Sound Country. University of Washington Press.
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