Slate Peak is a mountain summit located on the shared border between

Okanogan County Okanogan County () is a county located in the U.S. state of Washington along the Canada–U.S. border. As of the 2020 census, the population was 42,104. The county seat is Okanogan, while the most populous city is Omak. It is the largest c ...

and

Whatcom County Whatcom County (, ) is a county located in the northwestern corner of the U.S. state of Washington, bordered by the Lower Mainland (the Metro Vancouver and Fraser Valley Regional Districts) of the Canadian province of British Columbia to t ...

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

state. It is part of the Okanogan Range, which is a sub-range of the

North Cascades The North Cascades are a section of the Cascade Range of western North America. They span the border between the Provinces and territories of Canada, Canadian province of British Columbia and the U.S. state of Washington (state), Washington and ...

. The mountain is situated northwest of Mazama, on the boundary line of the

Pasayten Wilderness The Pasayten Wilderness is a protected area located within Okanogan–Wenatchee National Forest and Mount Baker National Forest in Washington state, centered on the Three Forks () of the Pasayten River, a tributary of the Similkameen River. ...

, on land managed by the

Okanogan–Wenatchee National Forest The Okanogan–Wenatchee National Forest is a U.S. National Forest located in Okanogan County, Washington, Okanogan County in north-central Washington (state), Washington, United States. The forest is bordered on the north by British Columbia, ...

. The peak has the distinction of having the highest road in Washington, as well as the highest fire lookout. Although the narrow one-lane white-knuckle road reaches the summit of the mountain, the Forest Service gated it to vehicles, which necessitates walking the final few hundred yards. Additionally, the

Pacific Crest Trail The Pacific Crest Trail (PCT), officially designated as the Pacific Crest National Scenic Trail, is a long-distance hiking and equestrian trail closely aligned with the highest portion of the Cascade and Sierra Nevada mountain ranges, which lie ...

traverses the west slope of the peak, and the West Fork Pasayten Trail traverses the eastern slope. The nearest higher peak is Devils Peak, to the north. Precipitation runoff from Slate Peak drains east into Pasayten River, or west into Slate Creek, which is in the

Skagit River The Skagit River ( ) is a river in southwestern British Columbia in Canada and northwestern Washington (state), Washington in the United States, approximately 150 mi (240 km) long. The river and its tributaries drain an area of 1.7&nbs ...

drainage basin.

Slate Peak Fire Lookout

The

fire lookout tower A fire lookout tower, fire tower, or lookout tower is a tower that provides housing and protection for a person known as a " fire lookout", whose duty it is to search for wildfires in the wilderness. It is a small building, usually on the summit ...

was originally constructed as a gable-roof cupola in 1924. In 1956 the Air Force leveled the mountain summit by removing 40 feet from the top of the peak (as well as the lookout) in order to install a radar station, which was never built. The present lookout sits atop a 41-foot tall tower which is maintained for emergency use. The Slate Peak Lookout was added to the

National Historic Lookout Register Established in 1990, the National Historic Lookout Register is a program administered by the United States Forest Service, the Forest Fire Lookout Association, the , the National Forestry Association, state forestry departments and United States ...

on November 4, 2000. On a clear day, visitors can see Silver Star Mountain,

The Needles The Needles are a row of three stacks of chalk that rise about out of the sea off the western extremity of the Isle of Wight in the English Channel, United Kingdom, close to Alum Bay and Scratchell's Bay, and part of Totland, the weste ...

, Tower Mountain,

Golden Horn The Golden Horn ( or ) is a major urban waterway and the primary inlet of the Bosphorus in Istanbul, Turkey. As a natural estuary that connects with the Bosphorus Strait at the point where the strait meets the Sea of Marmara, the waters of the ...

, Azurite Peak,

Mount Ballard Mount Ballard may refer to: * Mount Ballard (Antarctica) a mountain in Ellsworth Land, Antarctica * Mount Ballard (Arizona), a mountain in Cochise County, Arizona, * Mount Ballard (Washington) Mount Ballard is an double-summit mountain loca ...

, Jack Mountain, Crater Mountain, Monument Peak,

Robinson Mountain Robinson Mountain is an mountain summit located in western Okanogan County in Washington state. It is part of the Okanogan Range which is a sub-range of the North Cascades Range. The mountain is situated in the Pasayten Wilderness, on land ...

, and many others from the tower.

Climate

Weather front A weather front is a boundary separating air masses for which several characteristics differ, such as air density, wind, temperature, and humidity. Disturbed and unstable weather due to these differences often arises along the boundary. For ins ...

s 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 Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools down adiabatically, which can raise the relative humidity to 100% and cr ...

), 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 higher precipitation than the east side, 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.Beckey, Fred W. Cascade Alpine Guide, Climbing and High Routes. Seattle, WA: Mountaineers Books, 2008. July through September are the best months to visit in terms of favorable weather and the Forest Service access road being open for the season; however, smoke from distant wildfires may potentially reduce visibility, and smoky summer conditions have been increasing with climate change.

Geology

The North Cascades features some of the most rugged topography in the

Cascade Range The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington (state), Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as m ...

with craggy peaks, spires, ridges, and deep

glacial valley U-shaped valleys, also called trough valleys or glacial troughs, are formed by the process of glaciation. They are characteristic of mountain glaciation in particular. They have a characteristic U shape in cross-section, with steep, straight s ...

s. Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to the various climate differences. The history of the formation of the Cascade Mountains dates back millions of years ago to the late

Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...

Epoch. With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity persisted. In addition, small fragments of the

oceanic Oceanic may refer to: *Of or relating to the ocean *Of or relating to Oceania **Oceanic climate **Oceanic languages **Oceanic person or people, also called "Pacific Islander(s)" Places * Oceanic, British Columbia, a settlement on Smith Island, ...

and

continental lithosphere A lithosphere () is the rigid, outermost rocky shell of a terrestrial planet or natural satellite. On Earth, it is composed of the crust and the lithospheric mantle, the topmost portion of the upper mantle that behaves elastically on time sc ...

called

terrane In geology, a terrane (; in full, a tectonostratigraphic terrane) is a crust fragment formed on a tectonic plate (or broken off from it) and accreted or " sutured" to crust lying on another plate. The crustal block or fragment preserves its d ...

s created the

about 50 million years ago. During the

Pleistocene The Pleistocene ( ; referred to colloquially as the ''ice age, Ice Age'') is the geological epoch (geology), epoch that lasted from to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fin ...

period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured the landscape leaving deposits of rock debris. The U-shaped cross section of the river valleys is 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.

Gallery

File:HART PASS - SLATE PEAK (07-19-2022) Okanogan Co, WA.jpg, Slate Peak File:View from Slate Peak lookout tower looking west.jpg, A clear view from Slate Peak's tower looking west to Jack Mountain File:South panorama from Slate Peak.jpg, Panorama looking south from Slate Peak. Left to right: Silver Star, The Needles, Tower Mountain, Golden Horn File:The North Cascades- Slate Peak.jpg, Slate Peak File:Gated road to Slate Peak.jpg, Gated road to Slate Peak

References

External links

* Weather forecast
Slate Peak
* Slate Peak Trailhead
US Forest Service
* Slate Peak aerial photo
PBase
{{Geographic Location 2 , Center = Slate Peak , North = Pasayten Peak , Northeast = Haystack Mountain , East = Devils Peak , Southeast = Slate Pass , South = Harts Pass , Southwest = Tatie Peak , West = Slate Creek , Northwest = Tamarack Peak Okanagan Range Mountains of Okanogan County, Washington Mountains of Whatcom County, Washington Fire lookout towers in Washington (state) Two-thousanders of the United States

Slate Peak Fire Lookout

Climate

Geology

Gallery

See also

References

External links