West Butte (Montana)

Last updated
West Butte
West Butte, Sweetgrass Hills, Montana.jpg
Southeast aspect
Highest point
Elevation 6,983 ft (2,128 m) [1] [2]
Prominence 3,638 ft (1,109 m) [2]
Parent peak Kupunkamint Mountain (8,802 ft) [2]
Isolation 81.27 mi (130.79 km) [2]
Listing Most Isolated Summits in US
Coordinates 48°55′54″N111°32′01″W / 48.9316761°N 111.5336004°W / 48.9316761; -111.5336004 [3]
Geography
USA Montana relief location map.jpg
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West Butte
Location in Montana
Usa edcp relief location map.png
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West Butte
Location in the United States
CountryUnited States
State Montana
County Toole
Parent range Sweet Grass Hills [1]
Topo map USGS West Butte
Geology
Age of rock Eocene
Mountain type Laccolith
Type of rock Igneous rock
Climbing
Easiest route class 2

West Butte is a 6,983-foot-elevation (2,128-meter) mountain summit located in Toole County, Montana, United States.

Contents

Description

West Butte is the highest peak in the Sweet Grass Hills and the highest in the county. [1] [2] It is situated 34 miles (55 km) north-northeast of Shelby, Montana, and four miles (6.4 km) south of the Canada–United States border, on land administered by the Bureau of Land Management. [4] Precipitation runoff from the mountain drains south to the Marias River and north to the Milk River. [1] Topographic relief is significant as the summit rises 3,000 feet (910 meters) above the surrounding plains in 2.5 miles (4.0 km) which makes it a prominent landmark visible for many miles.

Geology

West Butte is an exposed laccolith composed of diorite porphyry and monzonite which was created by an igneous intrusion through older Mississippian sedimentary rocks during the Eocene, about 50 million years ago. [4] [5] These sedimentary rocks are primarily limestone and shale. Over time, erosion of the sedimentary rock has exposed the solidified laccolith which is more resistant to weathering.

History

The Sweet Grass Hills, which are centered in buffalo hunting territory, are sacred to the Blackfoot and other tribes. [6] The Blackfoot called West Butte "ami sítse katúyis" which means "west side sweet pine." [7] In 1806, Meriwether Lewis sighted West Butte from the Missouri River, which is 100 miles (160 km) distant, and George Mercer Dawson reported seeing it from 140 miles (230 km) away at Blackfoot Crossing in Alberta. [7] The landform's toponym has been officially adopted by the United States Board on Geographic Names. [3]

Climate

Based on the Köppen climate classification, West Butte is located in a semi-arid climate zone with long, cold, dry winters and hot summers with cool nights. [5] [8] Winter temperatures can drop below −10 °F with wind chill factors below −30 °F. The wettest period of the year is generally May through August, with up to 20 inches of precipitation falling annually on the peak. [5]

See also

Related Research Articles

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References

  1. 1 2 3 4 "West Butte, Montana". Peakbagger.com. Retrieved 2023-07-24.
  2. 1 2 3 4 5 "West Butte - 6,983' MT". listsofjohn.com. Retrieved 2023-07-24.
  3. 1 2 "West Butte". Geographic Names Information System . United States Geological Survey, United States Department of the Interior . Retrieved 2023-07-24.
  4. 1 2 Sweet Grass Hills, blm.gov, Retrieved 2023-07-24.
  5. 1 2 3 Sweet Grass Hills Resource(s) Management Plan (RMP) Amendment and West HiLine Resource(s) Management Plan (RMP), Toole County, Liberty County: Environmental Impact Statement, 1996, p. 13, 19.
  6. Rich Aarstad, Montana Place Names from Alzada to Zortman, Montana Historical Society, 2009, ISBN   9780975919613, p. 259.
  7. 1 2 William A Lovis, Robert Whallon (2016), Marking the Land, Routledge, ISBN   9781317361169, p. 48.
  8. Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrol. Earth Syst. Sci. 11. ISSN   1027-5606.