Mount Deception is a peak in the

Olympic Mountains The Olympic Mountains are a mountain range on the Olympic Peninsula of the Pacific Northwest of the United States. The mountains, part of the Pacific Coast Ranges, are not especially high – Mount Olympus (Washington), Mount Olympus is the high ...

of Cascadia. It is in

Olympic National Park Olympic National Park is a national park of the United States located in Washington, on the Olympic Peninsula. The park has four regions: the Pacific coastline, alpine areas, the west-side temperate rainforest, and the forests of the drier e ...

on the

Olympic Peninsula The Olympic Peninsula is a large peninsula in Western Washington that lies across Puget Sound from Seattle, and contains Olympic National Park. It is bounded on the west by the Pacific Ocean, the north by the Strait of Juan de Fuca, and the ...

in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

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 ...

Description

At high Mount Deception is the second highest peak of the Olympic Mountains, after

Mount Olympus Mount Olympus (, , ) is an extensive massif near the Thermaic Gulf of the Aegean Sea, located on the border between Thessaly and Macedonia (Greece), Macedonia, between the regional units of Larissa (regional unit), Larissa and Pieria (regional ...

. It is the highest peak of the eastern Olympics. Mount Deception's

prominence In topography, prominence or relative height (also referred to as autonomous height, and shoulder drop in US English, and drop in British English) measures the height of a mountain or hill's summit relative to the lowest contour line encircling ...

is , making it the 17th most prominent peak in Washington. Its nearest higher peak is Mount Olympus at to the west. Mount Deception is located in the northeast portion of the Olympics Mountains just northeast of Mount Mystery between Deception Creek and Royal Creek. The region is known as Royal Basin and includes the upper reaches of Royal Creek. Mount Deception lies at the head of Royal Basin. This location puts it in the

rain shadow A rain shadow is an area of significantly reduced rainfall behind a mountainous region, on the side facing away from prevailing winds, known as its leeward side. Evaporated moisture from body of water, bodies of water (such as oceans and larg ...

of the Olympics, resulting in far less precipitation than Mount Olympus and the western Olympics receive. Although Mount Deception is the highest peak in the eastern Olympics, it is not visible from

Seattle Seattle ( ) is the most populous city in the U.S. state of Washington and in the Pacific Northwest region of North America. With a population of 780,995 in 2024, it is the 18th-most populous city in the United States. The city is the cou ...

Radiating northward from the shoulders of Mount Deception are Gilhooley Tower,

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 ...

, Mount Clark (), Mount Walkinshaw (), and the northeasterly running spur known as Gray Wolf Ridge. To the east and south are Mount Fricaba, Hal Foss Peak, Mount Mystery, and Little Mystery. Two small

glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

s hug the mountain's north-facing

basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...

slopes.

USGS The United States Geological Survey (USGS), founded as the Geological Survey, is an government agency, agency of the United States Department of the Interior, U.S. Department of the Interior whose work spans the disciplines of biology, geograp ...

topographic maps Mount Deception sits on the boundary between the

drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...

s of the Dungeness River, to the north, and the Dosewallips River, to the south and east. Deception Creek, a tributary of the Dosewallips River, drains the southern slope of Mount Deception. Gray Wolf Pass is located about west of Mount Deception. The pass connects the Dungeness and Dosewallips drainage basins.

History

Mount Deception had been given the name Mount Holmes by the Seattle Press Expedition in honor of John H. Holmes of the ''

Boston Herald The ''Boston Herald'' is an American conservative daily newspaper whose primary market is Boston, Massachusetts, and its surrounding area. It was founded in 1846 and is one of the oldest daily newspapers in the United States. It has been awarde ...

''. Later, G.A. Whitehead of the

U.S. Forest Service The United States Forest Service (USFS) is an agency within the U.S. Department of Agriculture. It administers the nation's 154 national forests and 20 national grasslands covering of land. The major divisions of the agency are the Chief's ...

renamed it Mount Deception due to the difficulty mountaineers had in locating climbing routes on the often cloud-covered peak.

Recreation

Unlike the peaks of Gray Wolf Ridge, which are scalable for fit and determined day hikers, mountaineering skills are necessary for Mount Deception itself. While not a particularly technical climb, it is steep and exposed. If a climber falls and does not arrest immediately, loose rock and rotten snow may make it difficult to stop falling for some distance. Fatalities have occurred on Mount Deception and the National Park Service recommends climbers be experienced in self-arrest skills, rock climbing, and route-finding. The adjacent Needles are typically regarded as providing better, and somewhat more difficult, mountaineering objectives in the Royal Basin area.

Climate

Based on the

Köppen climate classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

, Mount Deception is located in the

marine west coast An oceanic climate, also known as a marine climate or maritime climate, is the temperate climate sub-type in Köppen classification represented as ''Cfb'', typical of west coasts in higher middle latitudes of continents, generally featuring co ...

climate zone of western

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

. Most

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 originate in the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

, and travel northeast toward the

. As fronts approach, they are forced upward by the peaks of the Olympic Range, causing them to drop their moisture in the form of rain or snowfall (

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 ...

). As a result, the Olympics experience high precipitation, especially during the winter months. 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. In terms of favorable weather, the best months for climbing are June through September.

Geology

The Olympic Mountains are composed of obducted

clastic Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus,Essentials of Geology, 3rd Ed, Stephen Marshak, p. G-3 chunks, and smaller grains of rock broken off other rocks by ...

wedge material and oceanic crust, primarily

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 ...

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

turbidite A turbidite is the geologic Deposition (geology), deposit of a turbidity current, which is a type of amalgamation of fluidal and sediment gravity flow responsible for distributing vast amounts of clastic sediment into the deep ocean. Sequencing ...

, and

ic oceanic crust. The mountains were sculpted 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 ...

era by erosion caused by glaciers advancing and retreating multiple times.

References

External links

* * * Mount Deception weather
Mountain Forecast
* Mt. Deception photo
Flickr
{{DEFAULTSORT:Deception, Mount Mountains of Washington (state) Olympic Mountains Mountains of Jefferson County, Washington Landforms of Olympic National Park