Twin Sisters is a mountain summit located in
San Juan County,
Colorado
Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...
, United States.
The lower west summit has an elevation of and 0.43 mile separates the pair.
Twin Sisters is part of the
San Juan Mountains
The San Juan Mountains is a high and rugged mountain range in the Rocky Mountains in southwestern Colorado and northwestern New Mexico. The area is highly mineralized (the Colorado Mineral Belt) and figured in the gold and silver mining industry ...
range which is a subset of the
Rocky Mountains
The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in straight-line distance from the northernmost part of western Canada, to New Mexico in ...
, and is west of the
Continental Divide
A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not ...
. It is situated 7.5 miles southwest of the community of
Silverton, on land managed by
San Juan National Forest
The San Juan National Forest is a U.S. National Forest covering over 1,878,846 acres (2,935.7 sq mi, or 7,603.42 km²) in western Colorado. The forest occupies land in Archuleta, Conejos, Dolores, Hinsdale, La Plata, Mineral, Montezuma ...
. It is set 5.5 miles north of
Engineer Mountain, and 2.2 miles east of Rolling Mountain, the nearest higher neighbor.
Other neighbors include
Snowdon Peak seven miles to the southeast, and
Golden Horn
The Golden Horn ( tr, Altın Boynuz or ''Haliç''; grc, Χρυσόκερας, ''Chrysókeras''; la, Sinus Ceratinus) is a major urban waterway and the primary inlet of the Bosphorus in Istanbul, Turkey. As a natural estuary that connects with t ...
, 3.5 miles to the northwest.
Topographic relief
Terrain or relief (also topographical relief) involves the vertical and horizontal dimensions of land surface. The term bathymetry is used to describe underwater relief, while hypsometry studies terrain relative to sea level. The Latin w ...
is significant as the north aspect rises above South Fork Mineral Creek in approximately 1.5 mile. The mountain's name, which has been officially adopted by the
United States Board on Geographic Names
The United States Board on Geographic Names (BGN) is a federal body operating under the United States Secretary of the Interior. The purpose of the board is to establish and maintain uniform usage of geographic names throughout the federal governm ...
, was in use in 1906 when
Henry Gannett
Henry Gannett (August 24, 1846 – November 5, 1914) was an American geographer who is described as the "father of mapmaking in America."Evans, Richard Tranter; Frye, Helen M. (2009).History of the Topographic Branch (Division) (PDF). ''U.S. Geo ...
published it in ''A Gazetteer of Colorado''.
[Henry Gannett, ''Gazetteer of Colorado'', 1906, US Government Printing Office, page 171.]
Climate
According to the
Köppen climate classification
The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...
system, Twin Sisters is located in an alpine
subarctic climate
The subarctic climate (also called subpolar climate, or boreal climate) is a climate with long, cold (often very cold) winters, and short, warm to cool summers. It is found on large landmasses, often away from the moderating effects of an ocean, ge ...
zone with long, cold, snowy winters, and cool to warm summers.
Due to its altitude, it receives precipitation all year, as snow in winter, and as thunderstorms in summer, with a dry period in late spring. Precipitation
runoff
Runoff, run-off or RUNOFF may refer to:
* RUNOFF, the first computer text-formatting program
* Runoff or run-off, another name for bleed, printing that lies beyond the edges to which a printed sheet is trimmed
* Runoff or run-off, a stock market ...
from the mountain drains into tributaries of the
Animas River
Animas River (''On-e-mas''; es, Río de las Ánimas) is a river in the western United States, a tributary of the San Juan River (Colorado River), San Juan River, part of the Colorado River, Colorado River System.
The Animas-La Plata Water Pro ...
.
See also
*
References
External links
* Weather forecast
Twin Sisters{{Mountains of Colorado
Mountains of San Juan County, Colorado
San Juan Mountains (Colorado)
Mountains of Colorado
North American 4000 m summits
San Juan National Forest