Terrace_Mountain_(Washington) Knowpia

Terrace Mountain
Terrace Mountain
	Terrace Mountain from the east
Highest point
Elevation	6,361 ft (1,939 m)
Prominence	721 ft (220 m)
Parent peak	Dip Top Peak (7,291 ft)
Isolation	2.77 mi (4.46 km)
Coordinates	47°37′18″N 121°11′51″W / 47.621749°N 121.19746°W
Geography
	Terrace Mountain Location in Washington Terrace Mountain Terrace Mountain (the United States)
Country	United States
State	Washington
County	King
Protected area	Alpine Lakes Wilderness
Parent range	Cascade Range
Topo map	USGS Mount Daniel
Climbing
Easiest route	Scrambling

Terrace Mountain is a 6,361-foot (1,939-metre) mountain summit located in the Alpine Lakes Wilderness in eastern King County of Washington state.^[1] It is part of the Cascade Range and is situated on land managed by Mount Baker-Snoqualmie National Forest.^[1] The peak is situated 4 mi (6.4 km) north of Mount Daniel, and is surrounded by Lake Clarice, Marmot Lake, Ptarmigan Lakes, and the Terrace Lakes. Precipitation runoff from the mountain drains into tributaries of the Skykomish River. Topographic relief is significant as the summit rises over 1,800 feet (550 meters) above Lake Clarice in less than one-half mile (0.8 km). The mountain's descriptive name stems from the terrace-like appearance created by a series of benches on its east aspect.

Geology edit

The Alpine Lakes Wilderness features some of the most rugged topography in the Cascade Range with craggy peaks and ridges, deep glacial valleys, and granite walls spotted with over 700 mountain lakes.^[3] Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to various climate differences.

South aspect, with Glacier Peak

The history of the formation of the Cascade Mountains dates back millions of years ago to the late Eocene Epoch.^[4] With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity persisted.^[4] Glacier Peak, a stratovolcano that is 33.5 mi (53.9 km) north of Terrace Mountain, began forming in the mid-Pleistocene. During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured and shaped the landscape.^[4] The last glacial retreat in the Alpine Lakes area began about 14,000 years ago and was north of the Canada–US border by 10,000 years ago.^[4] The U-shaped cross section of the river valleys is a result of that 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 Alpine Lakes Wilderness area.

Climate edit

Terrace Mountain in early spring

Terrace Mountain is located in the marine west coast climate zone of western North America.^[5] Most weather fronts originating in the Pacific Ocean travel northeast toward the Cascade Mountains. As fronts approach, 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 Cascades experiences high precipitation, especially during the winter months in the form of snowfall. Because of maritime influence, snow tends to be wet and heavy, resulting in high avalanche danger.^[5] 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.^[5]

References edit

^ ^a ^b ^c ^d ^e "Terrace Mountain, Washington". Peakbagger.com.
^ ^a ^b "Terrace Mountain - 6,361' WA". listsofjohn.com. Retrieved 2021-01-08.
^ Smoot, Jeff (2004). Backpacking Washington's Alpine Lakes Wilderness. Helena, Montana: The Globe Pequot Press.
^ ^a ^b ^c ^d Kruckeberg, Arthur (1991). The Natural History of Puget Sound Country. University of Washington Press.
^ ^a ^b ^c Beckey, Fred W. Cascade Alpine Guide, Climbing and High Routes. Seattle, WA: Mountaineers Books, 2008.