Yellowstone Lake

Yellowstone Lake

Infobox_lake
lake_name = Yellowstone Lake
image_lake = lakeyellowstonebig.jpg
caption_lake = on a fall morning
image_bathymetry =
caption_bathymetry =
location = Yellowstone National Park, Wyoming
coords = coord|44|28|N|110|22|W|type:waterbody_region:US|display=inline,title
type =
inflow =
outflow = Yellowstone River
catchment =
basin_countries = United States
length = 20 mi (32 km)
width = 15 mi (24 km)
area = 136 sq mi (352 km²)
depth = 139 ft (42 m)
max-depth = 390 ft (118 m)
volume =
residence_time =
shore = 110 mi (177 km)
elevation = 7,732 ft (2,376 m)
islands = 6
cities =

Yellowstone Lake is the largest body of water in Yellowstone National Park, The lake is 7,732 feet (2,376 m) above sea level and covers 136 square miles (352 km²) with 110 miles (177 km) of shoreline. While the average depth of the lake is 139 feet (42 m) its deepest spot is at least 390 feet (118 m). Yellowstone Lake is the largest freshwater lake above 7,000 feet (2,133 m) in North America.cite web| last =| first =| coauthors =| title =Frequently Asked Questions at Lake Village| publisher =National Park Service| date =June 27, 2006| url =http://www.nps.gov/yell/planyourvisit/lakefaq.htm| accessdate = 2007-07-29]

In winter, ice nearly 3 feet (1 m) thick covers much of the lake, except where shallow water covers hot springs. The lake freezes over by early December and can remain frozen until late May or early June.

Geology

In the southwest area of the lake the West Thumb geothermal area is easily accessible to visitors. Geysers, fumaroles and hot springs are found alongside and even in the lake. See Geothermal areas of Yellowstone.

In recent years (as of 2004), the ground under the lake has started to rise significantly, indicating increased geological activity, and limited areas of the national park have been closed to the public. As of 2005, no areas are currently off limits aside from those normally allowing limited access such as around the West Thumb Geyser Basin. There is a 'bulge' about 2,000 feet (600 m) long and 100 feet (30 m) high under a section of Yellowstone Lake, where there are a variety of faults, hot springs and small craters. Seismic imaging has recently shown that sediment layers are tilted, but how old this feature is has not yet been established.

After the magma chamber under the Yellowstone area collapsed 600,000 years ago in its previous great eruption, it formed a large caldera that was later partially filled by subsequent lava flows (see Yellowstone Caldera). Part of this caldera is the 136 square mile (352 km²) basin of Yellowstone Lake. The original lake was 200 feet (60 m) higher than the present-day lake, extending northward across Hayden Valley to the base of Mount Washburn.

It is thought that Yellowstone Lake originally drained south into the Pacific Ocean via the Snake River. The lake currently drains north from its only outlet, the Yellowstone River, at Fishing Bridge. The elevation of the lake's north end does not drop substantially until LeHardy Rapids. Therefore, this spot is considered the actual northern boundary of Yellowstone Lake. Within a short distance downstream the Yellowstone River plunges first over the upper and then the lower falls and races north through the Grand Canyon of the Yellowstone.

In the 1990s, geological research has determined that the two volcanic vents, now known as "resurgent domes", are rising again. From year to year, they either rise or fall, with an average net uplift of about one inch per year. During the period between 1923 and 1985, the Sour Creek Dome was rising. In the years since 1986, it has either declined or remained the same. The resurgence of the Sour Creek dome, just north of Fishing Bridge is causing Yellowstone Lake to "tilt" southward. Larger sandy beaches can now be found on the north shore of the lake, and flooded areas can be found in the southern arms.

The Hayden Valley was once filled by an arm of Yellowstone Lake. Therefore, it contains fine-grained lake sediments that are now covered with glacial till left from the most recent glacial retreat 13,000 years ago. Because the glacial till contains many different grain sizes, including clay and a thin layer of lake sediments, water cannot percolate readily into the ground. This is why the Hayden Valley is marshy and has little encroachment of trees.

ee also

* Angling in Yellowstone National Park

References cited

External links

* [http://volcanoes.usgs.gov/yvo/new.html USGS answers questions about the 'bulge' under Yellowstone Lake.]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Yellowstone Lake — vom West Thumb Geyser Basin aus betrachtet Geographische Lage Wyoming (USA) …   Deutsch Wikipedia

  • Yellowstone-Lake — vom West Thumb Geyser Basin aus betrachtet Der Yellowstone Lake (früher auch Lake Eustis und Sublette s Lake) ist mit 354 km² der größte See des Yellowstone Nationalparks und der größte Bergsee Nordamerikas. Er liegt auf 2357 Metern Höhe im Süden …   Deutsch Wikipedia

  • Yellowstone Lake — lake in Yellowstone National Park, fed by the Yellowstone River: 137 sq mi (355 sq km) …   English World dictionary

  • Yellowstone Lake State Park — Geobox|Protected area name = Yellowstone Lake State Park category = Wisconsin State Park category iucn = V image caption = country = United States country state = Wisconsin state state type = State region type = County region = Lafayette city… …   Wikipedia

  • Yellowstone Lake — a lake in NW Wyoming, in Yellowstone National Park. 20 mi. (32 km) long; 140 sq. mi. (363 sq. km). * * * Lake, Yellowstone National Park, northwestern Wyoming, U.S. It lies at 7,731 ft (2,356 m) above sea level, the largest body of water in North …   Universalium

  • Yellowstone Lake — Yel′lowstone Lake′ n. geg a lake in NW Wyoming, in Yellowstone National Park. 20 mi. (32 km) long; 140 sq. mi. (363 sq. km) …   From formal English to slang

  • Yellowstone Lake — a lake in NW Wyoming, in Yellowstone National Park. 20 mi. (32 km) long; 140 sq. mi. (363 sq. km) …   Useful english dictionary

  • Yellowstone National Park — Yellowstone redirects here. For other uses, see Yellowstone (disambiguation). Yellowstone National Park Grand Canyon of Yellowstone Location …   Wikipedia

  • Yellowstone National Park — Yellowstone Nationalpark Yellowstone Nationalpark …   Deutsch Wikipedia

  • Yellowstone Park — Yellowstone Nationalpark Yellowstone Nationalpark …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”