geo.wikisort.org - Mountains

Williams Peak is a prominent 2,123-metre (6,965-foot) mountain summit located in the Chilliwack River valley of the Cascade Mountains in southwestern British Columbia, Canada. It is situated 14 km (9 mi) north of the Canada–United States border, 6 km (4 mi) northwest of Chilliwack Lake, and 6.7 km (4 mi) southeast of Foley Peak, which is its nearest higher peak. Williams Peak is the highest point of the South Hope Mountains, which is a subset of the Skagit Range.[3] Precipitation runoff from the peak drains into tributaries of the Chilliwack River. The mountain's name was officially adopted April 7, 1955, by the Geographical Names Board of Canada.[4] Williams Peak was first climbed July 1908 by James J. McArthur and E.T. de Coeli via the southwest ridge.[1]

Williams Peak
Williams Peak, west aspect
Highest point
Elevation	2,123 m (6,965 ft)[1]
Prominence	793 m (2,602 ft)[1]
Parent peak	Foley Peak (2293 m)[1]
Listing	Mountains of British Columbia
Coordinates	49°07′46″N 121°30′19″W[2]
Geography
Williams Peak Location in British Columbia Show map of British Columbia Williams Peak Williams Peak (Canada) Show map of Canada
Location	British Columbia, Canada
District	Yale Division Yale Land District
Parent range	Skagit Range North Cascades
Topo map	NTS 92H4 Chilliwack[2]
Geology
Mountain type	Intrusive
Volcanic arc/belt	Pemberton Volcanic Belt
Climbing
First ascent	1908 by James J. McArthur and E.T. de Coeli
Easiest route	Scrambling

Geology

Williams Peak is related to the Chilliwack batholith, which intruded the region 26 to 29 million years ago after the major orogenic episodes in the region. This is part of the Pemberton Volcanic Belt, an eroded volcanic belt that formed as a result of subduction of the Farallon Plate starting 29 million years ago.[5][6][7]

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.

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 which lead to vegetation variety defining the ecoregions in this area.

Climate

Based on the Köppen climate classification, Williams Peak is located in the marine west coast climate zone of western North America.[9] Most weather fronts originate in the Pacific Ocean, and travel east toward the Cascade Range 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 Cascade Mountains experience high precipitation, especially during the winter months in the form of snowfall. Temperatures can drop below −20 °C with wind chill factors below −30 °C. The months July through September offer the most favorable weather for climbing Williams Peak.

Climbing Routes

Established rock climbing routes on Williams Peak:[1]

• Southwest Ridge - class 3 First Ascent 1908
• East Buttress - class 5.7 FA 1980
• Standard "Gulley Route" - class 3
• North side

See also

• Canadian Cascade Arc
• Geography of the North Cascades
• Geology of British Columbia

References

External links

• Weather: Williams Peak
• Climbing Williams Peak: YouTube

---