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Wenatchee Mountains

From Wikipedia, the free encyclopedia

Wenatchee Mountains
Bills Peak in the Teanaway area
Highest point
PeakMount Stuart
Elevation9,415 ft (2,870 m)
Coordinates47°28′30.5″N 120°54′08.6″W / 47.475139°N 120.902389°W / 47.475139; -120.902389
Dimensions
Length50 mi (80 km) east-west
Geography
CountryUnited States
StateWashington
CountiesChelan and Kittitas
Parent rangeCascade Range
Dragontail Peak from a meadow on Cashmere Mountain

The Wenatchee Mountains are a range of mountains in central Washington State, United States of America. A major subrange of the Cascade Range, extending east 50 miles (80 km) from the Cascade crest, the Wenatchee Mountains separate the drainage basins of the Yakima River from the Wenatchee River.[1] The crest of the range forms part of the boundary between Chelan and Kittitas Counties.

YouTube Encyclopedic

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  • Lahars - Volcanic Mudflows
  • 'Nick On The Fly' #9 - Camas Meadows with Randy Lewis
  • 'Nick On The Fly' #25 - Icicle Creek Exotic Bedrock
  • How is Kittitas County a fire environment?
  • Sustaining Our Northwest World: Rare Plant Conservation in the Pacific Northwest

Transcription

I-90 after dropping into the beautiful Kittitas Valley near the Thorp Fruit & Antique Barn. Look north at Milepost 98 across those hayfields to the white cliffs where the Yakima River has cut a canyon through some thick white rock layers. There�s plenty of sandstone in this part of Washington, but not here. These are volcanic mudflows. 10 million years old. Lahars from an extinct volcano. And you might be surprised to hear where that volcano used to stand. Notice the big Cascade rocks floating in the middle of the deposit, fragile chunks of white pumice, no sorting of the rocks by size that you�d see in a sandstone or river deposit. This thing formed quickly. No time for the big rocks to settle out. Three lahars are exposed in this cliff, but there�s a total of 15 lahars in a stack of light-colored layers here - totaling 1000 feet thick. Lahars form when cone-shaped volcanoes erupt. During the eruption, the flank of the volcano fails. Water and glacial ice in the landslide mix with rock to convert the landslide into a volcanic mudflow, like a slurry of wet concrete. Lahars follow river valleys and are deadly to those in their path. The lahars have been clocked at up to 80 miles per hour - and can be up to hundreds of feet thick stretching from valley wall to valley wall. Remember the Duwamish River entering the Puget Sound in one of our first episodes back in Seattle? The Duwamish drains an area between Seattle and Mt Rainier. 5,600 years ago, a Mt Rainier that was 1500 feet taller than today - erupted and the northeast flank of the mountain failed. The massive Osceola Mudflow - a 400 foot-thick lahar that surged 50 mph down the White River - poured into the Puget Sound 60 miles from the mountain. Fine sands from the Osceola have been redeposited as far north as where the Duwamish River enters the Sound in downtown Seattle. More than 150,000 people now live on the Osceola Lahar and Mt Rainier - an active volcano - has rebuilt itself and is poised for its next eruption. So are these volcanic mudflows at Thorp from Mt Rainier? They�re not. If you go upstream on the Yakima River from here, you don�t head towards Mt Rainier. And besides, these volcanic deposits here are heading a different direction. These mudflows extend to the southwest, beneath hay fields, beneath I-90, and continue all the way to the William O. Douglas Wilderness west of Yakima. 10 million years ago, a cone-shaped volcano erupted near White Pass and a river valley once flowed northeast from the White Pass area to here in Thorp. There�s a buried river valley underneath Interstate-90 at Milepost 98. Since 10 million years ago, a series of ridges have uplifted south of I-90. The old river is gone, the old volcano is gone. The lahars at Thorp. Striking evidence for just one of many extinct volcanoes in the Cascades.

Extent

Fred Beckey describes the Wenatchee Mountains as the area between the Wenatchee and Yakima rivers and Stevens Pass. Among the range's significant features he describes are Mount Stuart, the second highest non-volcanic peak in Washington and one of the largest single granitic mountains in the United States, the Cashmere Crags, the Lost World Plateau, Edward Plateau, and Dragontail Plateau, the Enchantment Lakes Basin ("one of the most marvelous examples of an ice-sculpted wilderness in the Cascade Range″), Icicle Creek and its narrow, U-shaped valley over 6,000 feet (1,800 m) deep, one of the deepest in the Cascades, and the Wenatchee River's unusual winding Tumwater Canyon gorge.[1]

According to Peakbagger.com the Wenatchee Mountains are defined as bounded by U.S. Route 2 from Stevens Pass to Wenatchee on the Columbia River, then down the Columbia River to Interstate 90, then west along the highway to the vicinity of Cle Elum and Roslyn, then north along Cle Elum Lake and the Cle Elum River and north to Stevens Pass.[2] Subranges of the Wenatchee Mountains and their highest peaks as defined by Peakbagger.com are the Chiwaukum Mountains (Big Chiwaukum Mountain, 8,501 feet (2,591 m)), North Wenatchee Mountains (Cashmere Mountain, 8,501 feet (2,591 m)), Stuart Range (Mount Stuart, 9,415 feet (2,870 m)), the Teanaway Area (Ingalls Peak, 7,662 feet (2,335 m)), and the Mission-Naneum Ridges (Mission Peak, 6,876 feet (2,096 m)).[2] Peakbagger.com also defines and names the mountain regions bordering the Wenatchee Mountains. These are the Alpine Lakes Area to the west, South Cascade Crest to the south, Glacier Peak-North Stevens Pass area to the northwest, and the Entiat Mountains to the northeast.[2]

The USGS GNIS defines the range with a simple list seven points in a line, running from approximately Paddy-Go-Easy Pass and Granite Mountain to approximately Blewett Pass and Naneum Creek.[3]

Major Peaks

Mount Stuart from the south

Partial list of peaks:

Map this section's coordinates using: OpenStreetMap

Download coordinates as:

Natural history

Lewisiopsis tweedyi on Tronsen Ridge, Wenatchee Mountains

The Wenatchee Mountains are in the rain shadow of the main Cascade Range and hence are drier and have fewer trees. This comparative lack of trees offers good wildflower displays and wide views. Serpentine soils are found within the Wenatchee Mountains, modifying the plant communities in those areas.[25]

The Wenatchee Mountains are home to a number of rare, endemic, or disjunct plant species, including Androsace nivalis var. dentata, Claytonia megarhiza var. nivalis, Delphinium viridescens, Lewisiopsis tweedyi, Trifolium thompsonii, and Valeriana columbiana.[25] The Wenatchee Mountains checkermallow (Sidalcea oregano var. calva) occurs only along Peshastin Creek, south of Leavenworth, Washington. It is the rarest plant in Washington, and is now on the endangered species list.

See also

References

  1. ^ a b Beckey, Fred (2000). Cascade Alpine Guide: Climbing and High Routes: Columbia River to Stevens Pass (3rd ed.). The Mountaineers. pp. 233–238. ISBN 978-0-89886-577-6.
  2. ^ a b c "Wenatchee Mountains". Peakbagger.com. Retrieved 9 August 2009.
  3. ^ U.S. Geological Survey Geographic Names Information System: Wenatchee Mountains
  4. ^ "Mount Stuart". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-14.
  5. ^ "Dragontail Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-14.
  6. ^ "Colchuck Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-14.
  7. ^ "Cannon Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-14.
  8. ^ "Sherpa Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-14.
  9. ^ "Enchantment Peak, Washington". PeakBagger.com. Retrieved 2018-06-15.
  10. ^ "Witches Tower, Washington". PeakBagger.com. Retrieved 2018-06-15.
  11. ^ "Cashmere Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  12. ^ "Argonaut Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  13. ^ "Little Annapurna". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  14. ^ "McClellan Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-08-02.
  15. ^ "Eightmile Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  16. ^ "The Cradle". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  17. ^ "Hawkins Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2020-07-08.
  18. ^ "Granite Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  19. ^ "Earl Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2020-07-02.
  20. ^ "Mac Peak". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  21. ^ "Three Brothers". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2021-06-19.
  22. ^ "Trico Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  23. ^ "Thunder Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-06-15.
  24. ^ "Slippery Slab Tower, Washington". PeakBagger.com. Retrieved 2018-06-15.
  25. ^ a b Kruckeberg, Arthur; Leuthy, Coleman (Summer 1991). "The Wenatchee Mountains" (PDF). Bulletin of the American Rock Garden Society. 49 (3): 162–168.

External links

Wikimedia Commons has media related to Wenatchee Mountains.
This page was last edited on 19 June 2021, at 21:06
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