Wyoming,Grand Teton National Park,

Wyoming,Grand Teton National Park,

Wyoming,Grand Teton National Park,

Grand Teton National Park is a United States National Park in northwestern Wyoming. At approximately 310,000 acres, the park includes the major peaks of the 40-mile-long Teton Range as well as most of the northern sections of the valley known as Jackson Hole. It is only 10 miles south of Yellowstone National Park, to which it is connected by the National Park Service-managed John D. Rockefeller, Jr. Memorial Parkway. Along with surrounding National Forests, these three protected areas constitute the almost 18,000,000-acre Greater Yellowstone Ecosystem, one of the largest intact mid-latitude temperate ecosystems in the world. Human history of the Grand Teton region dates back at least 11,000 years, when the first nomadic hunter-gatherer Paleo-Indians began migrating into the region during warmer months pursuing food and supplies. In the early 19th century, the first White explorers encountered the eastern Shoshone natives.  Between 1810 and 1840, the region attracted fur trading companies that vied for control of the lucrative beaver pelt trade. U.S. Government expeditions to the region commenced in the mid-19th century as an offshoot of exploration in Yellowstone, with the first permanent white settlers in Jackson Hole arriving in the 1880s. Efforts to preserve the region as a national park commenced in the late 19th century, and in 1929 Grand Teton
National Park was established, protecting the major peaks of the Teton Range. The valley of Jackson Hole remained in private ownership until the 1930s, when conservationists led by John D. Rockefeller, Jr. began purchasing land in Jackson Hole to be added to the existing national park. Against public opinion and with repeated Congressional efforts to repeal the measures, much of Jackson Hole was set aside for protection as Jackson Hole National Monument in 1943. The monument was abolished in 1950 and most of the monument land was added to Grand Teton National Park.

Grand Teton National Park is named for Grand Teton, the tallest mountain in the Teton Range. The naming of the mountains is attributed to early 19th-century French-speaking trappers—les trois tetons was later anglicized and shortened to Tetons. At 13,775 feet, Grand Teton abruptly rises more than 7,000 feet above Jackson Hole, almost 850 feet higher than Mount Owen, the second-highest summit in the range. The park has numerous lakes, including 15-mile-long Jackson Lake as well as streams of varying length and the upper main stem of the Snake River. Though in a state of recession, a dozen small glaciers persist at the higher elevations near the highest peaks in the range. Some of the rocks in the park are the oldest found in any U.S. National Park and have been dated at nearly 2.7 billion years.

Grand Teton National Park is an almost pristine ecosystem and the same species of flora and fauna that have existed since prehistoric times can still be found there. More than 1,000 species of vascular plants, dozens of species of mammals, 300 species of birds, more than a dozen fish species and a few species of reptiles and amphibians exist. Due to various changes in the ecosystem, some of them human-induced, efforts have been made to provide enhanced protection to some species of native fish and the increasingly threatened whitebark pine. Grand Teton National Park is a popular destination for mountaineering, hiking, fishing and other forms of recreation. There are more than 1,000 drive-in campsites and over 200 miles of hiking trails that provide access to backcountry camping areas. Noted for world-renowned trout fishing, the park is one of the few places to catch Snake River fine-spotted cutthroat trout. Grand Teton has several National Park Service-run visitor centers, and privately operated concessions for motels, lodges, gas stations and marinas. Most of the lakes in the park were formed by glaciers and the largest of these lakes are located at the base of the Teton Range. In the northern section of the park lies Jackson Lake, the largest lake in the park at 15 mi in length, 5 mi wide and 438 ft deep. Though Jackson Lake is natural, the Jackson Lake Dam was constructed at its outlet before the creation of the park and the lake level was raised almost 40 ft (12 m) consequently. East of the Jackson Lake Lodge lies Emma Matilda and Two Ocean Lakes. South of Jackson Lake, Leigh, Jenny, Bradley, Taggart and Phelps Lakes rest at the outlets of the canyons which lead into the Teton Range. Within the Teton Range, small alpine lakes in cirques are common, and there are more than 100 scattered throughout the high country.

Lake Solitude, located at an elevation of 9,035 ft, is in a cirque at the head of the North Fork of Cascade Canyon. Other high altitude lakes can be found at over 10,000 ft in elevation and a few, such as Icefloe Lake, remain ice clogged for much of the year. The park is not noted for large waterfalls; however, 100-foot high Hidden Falls just west of Jenny Lake is easy to reach after a short hike. From its headwaters on Two Ocean Plateau in Yellowstone National Park, the Snake River flows north to south through the park, entering Jackson Lake near the boundary of Grand Teton National Park and John D. Rockefeller, Jr. Memorial Parkway. The Snake River then flows through the spillways of the Jackson Lake Dam and from there southward through Jackson Hole, exiting the park just west of the Jackson Hole Airport. The largest lakes in the park all drain either directly or by tributary streams into the Snake River. Major tributaries which flow into the Snake River include Pacific Creek and Buffalo Fork near Moran and the Gros Ventre River at the southern border of the park. Through the comparatively level Jackson Hole valley, the Snake River descends an average of 19 feet per mile, while other streams descending from the mountains to the east and west have higher gradients due to increased slope. The Snake River creates braids and channels in sections where the gradients are lower and in steeper sections, erodes and undercuts the cobblestone terraces once deposited by glaciers.

The major peaks of the Teton Range were carved into their current shapes by long vanished glaciers. Commencing 250,000–150,000 years ago, the Tetons went through several periods of glaciation with some areas of Jackson Hole covered by glaciers 2,000 ft thick. This heavy glaciation is unrelated to the uplift of the range itself and is instead part of a period of global cooling known as the Quaternary glaciation. Beginning with the Buffalo Glaciation and followed by the Bull Lake and then the Pinedale glaciation, which ended roughly 15,000 years ago, the landscape was greatly impacted by glacial activity. During the Pinedale glaciation, the landscape visible today was created as glaciers from the Yellowstone Plateau flowed south and formed Jackson Lake, while smaller glaciers descending from the Teton Range pushed rock moraines out from the canyons and left behind lakes near the base of the mountains. The peaks themselves were carved into horns and arêtes and the canyons were transformed from water-eroded V-shapes to glacier-carved U-shaped valleys. Approximately a dozen glaciers currently exist in the park, but they are not ancient as they were all reestablished sometime between 1400 and 1850 AD during the Little Ice Age. Of these more recent glaciers, the largest is Teton Glacier, which sits below the northeast face of Grand Teton. Teton Glacier is 3,500 ft long and 1,100 ft wide, and nearly surrounded by the tallest summits in the range. Teton Glacier is also the best studied glacier in the range, and researchers concluded in 2005 that the glacier could disappear in 30 to 75 years. West of the Cathedral Group near Hurricane Pass, Schoolroom Glacier is tiny but has well defined terminal and lateral moraines, a small proglacial lake and other typical glacier features in close proximity to each other.