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Bonanza Peak is a tall peak in the North Cascades in the U.S. state of Washington and the Glacier Peak Wilderness of the Wenatchee National Forest. At 9,516 feet (2,900 m) in elevation, it is the highest point in Chelan County,[1][3] and the highest non-volcanic peak in Washington[4] and the Cascade Range as a whole.[5] Bonanza Peak's prominence is 3,711 feet (1,131 m), making it the 26th most prominent peak in Washington. The nearest higher peak is Glacier Peak, 14.4 miles (23.2 km) to the southwest.[1]

Bonanza Peak
North aspect featuring Company Glacier
Highest point
Elevation	9,516 ft (2,900 m)[1]
Prominence	3,711 ft (1,131 m)[1]
Isolation	13.8 mi (22.2 km)[1]
Coordinates	48°14′18″N 120°51′59″W
Geography
Bonanza Peak Location in Washington Show map of Washington (state) Bonanza Peak Bonanza Peak (the United States) Show map of the United States
Location	Glacier Peak Wilderness Chelan County, Washington, U.S.
Parent range	North Cascades
Topo map	USGS Holden
Climbing
First ascent	1937 by Curtis James and party[2]

Bonanza Peak is flanked with three large glaciers: Company Glacier to the north, Mary Green Glacier to the east, and Isella Glacier to the south.[6]

History

Bonanza Peak was originally named North Star Mountain, with a minor mountain to the southwest given the name Bonanza Peak. The USGS’ first topographic map of the region in 1904, however, mistakenly interchanged the names and the USGS naming was retained.[7]

Bonanza Peak was first summited in 1937 by Curtis I. James, Barrie James, and Joe Leuthold, all members of the Mazamas.[7]

Climate

Lying east of the Cascade crest, the area around Bonanza Peak is a bit drier than areas to the west. Summers can bring warm temperatures and occasional thunderstorms. 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 North Cascades experiences high precipitation, especially during the winter months in the form of snowfall.[2] Precipitation runoff from the mountain and meltwater from its glaciers drains to nearby Lake Chelan via Agnes, Company, and Railroad Creeks,

Geology

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

The history of the formation of the Cascade Mountains dates back millions of years ago to the late Eocene Epoch.[8] With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity persisted.[8] Glacier Peak, a stratovolcano that is 14.4 mi (23.2 km) southwest of Bonanza Peak, began forming in the mid-Pleistocene.[2] In addition, small fragments of the oceanic and continental lithosphere called terranes created the North Cascades about 50 million years ago.[8]

During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured the landscape leaving deposits of rock debris.[8] 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.

See also

• Geography of the North Cascades
• List of mountain peaks of Washington (state)

Gallery

• 
  Bonanza from Lyman Lakes area
• 
  Bonanza and North Star Mountain, from Plummer Mountain

References

External links

• Bonanza and Martin Peaks: PBase aerial photo
• Weather forecast: Bonanza Peak

На других языках

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[de] Bonanza Peak (Washington)

Der Bonanza Peak ist ein hoher Berg in den North Cascades im US-Bundesstaat Washington. Er liegt in der Glacier Peak Wilderness im Wenatchee National Forest. Mit 9.516 ft (2.900 m) Höhe ist er der höchste Punkt im Chelan County[1][2] und der höchste nicht-vulkanische Gipfel in Washington[3] sowie der gesamten Kaskadenkette.[4] Die Schartenhöhe des Bonanza Peak liegt bei 3.711 ft (1.131 m), was ihn auf der Liste der prominentesten Berge in Washington auf Platz 26 setzt. Der nächste höhere Gipfel ist der Glacier Peak, 14,4 mi (23,2 km) südwestlich gelegen.[1]

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- [en] Bonanza Peak (Washington)

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[fr] Pic Bonanza

Le pic Bonanza, en anglais Bonanza Peak, est une montagne des North Cascades dans l'État de Washington dans le Nord-Ouest des États-Unis.

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[it] Bonanza Peak

Il Bonanza Peak è una delle montagne più elevate delle North Cascades nello stato di Washington, della riserva naturale di Glacier Peak e della foresta nazionale di Wenatchee. Alto 2900 metri sul livello del mare, è il punto più alto nella contea di Chelan e la vetta non vulcanica più alta del Washington.[1][3][4][5] La prominenza topografica del Bonanza Peak è pari a 1131 metri, cifra che lo rende il 26º in classifica nel Washington. La vetta maggiore più vicina è Glacier Peak, localizzata a 23,2 km a sud-ovest.[1]

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