Oil and Gas Operators Handbook

Yosemite Park

/joʊˈsɛmɨtiː/

Yosemite is one of the largest and least fragmented habitat blocks in the Sierra Nevada, and the park supports a diversity of plants and animals. The park has an elevation range from 2,127 to 13,114 feet (648 to 3,997 m) and contains five major vegetation zones: chaparral/oak woodland, lower montane forest, upper montane forest, subalpine zone, and alpine. Of California's 7,000 plant species, about 50% occur in the Sierra Nevada and more than 20% within Yosemite. There is suitable habitat or documentation for more than 160 rare plants in the park, with rare local geologic formations and unique soils characterizing the restricted ranges many of these plants occupy.^[5]

The geology of the Yosemite area is characterized by granitic rocks and remnants of older rock. About 10 million years ago, the Sierra Nevada was uplifted and then tilted to form its relatively gentle western slopes and the more dramatic eastern slopes. The uplift increased the steepness of stream and river beds, resulting in formation of deep, narrow canyons. About 1 million years ago, snow and ice accumulated, forming glaciers at the higher alpine meadows that moved down the river valleys. Ice thickness in Yosemite Valley may have reached 4,000 feet (1,200 m) during the early glacial episode. The downslope movement of the ice masses cut and sculpted the U-shaped valley that attracts so many visitors to its scenic vistas today.^[5]

Yosemite is famous for its high concentration of waterfalls in a small area. Numerous sheer drops, glacial steps and hanging valleys in the park provide many places for waterfalls to exist, especially during April, May, and June (the snowmelt season). Located in Yosemite Valley, the Yosemite Falls is the highest in North America at 2,425-foot (739 m). Also in Yosemite Valley is the much lower volume Ribbon Falls, which has the highest single vertical drop, 1,612 feet (491 m).^[16] Perhaps the most prominent of the Yosemite Valley waterfalls is Bridalveil Fall, which is the waterfall seen from the Tunnel View viewpoint at the east end of the Wawona Tunnel. Wapama Falls in Hetch Hetchy Valley is another notable waterfall. Hundreds of ephemeral waterfalls also exist in the park.

All glaciers in the park are relatively small glaciers that occupy areas that are in almost permanent shade, such as north- and northeast-facing cirques. Lyell Glacier is the largest glacier in Yosemite (the Palisades Glaciers are the largest in the Sierra Nevada) and covers 160 acres (65 ha).^[20] None of the Yosemite glaciers are a remnant of the much, much larger Ice Age alpine glaciers responsible for sculpting the Yosemite landscape. Instead, they were formed during one of the neoglacial episodes that have occurred since the thawing of the Ice Age (such as the Little Ice Age).^[15] Climate change has reduced the number and size of glaciers around the world. Many Yosemite glaciers, including Merced Glacier, which was discovered by John Muir in 1871 and bolstered his glacial origins theory of the Yosemite area, have disappeared and most of the others have lost up to 75% of their surface area.^[20]

Yosemite has a Mediterranean climate, meaning most precipitation falls during the mild winter, and the other seasons are nearly dry (less than 3% of precipitation falls during the long, hot summers).^[21] Because of orographic lift, precipitation increases with elevation up to 8,000 feet (2,400 m) where it slowly decreases to the crest. Precipitation amounts vary from 36 inches (910 mm) at 4,000 feet (1,200 m) elevation to 50 inches (1,300 mm) at 8,600 feet (2,600 m). Snow does not typically persist on the ground until November in the high country. It accumulates all winter and into March or early April.< winter.

Mean daily temperatures range from 25 to 53 °F (-3.9 to 11.5 °C) at Tuolumne Meadows at 8,600 feet (2,600 m). At the Wawona Entrance (elevation 5,130 feet / 1,560 metres), mean daily temperature ranges from 36 to 67 °F (2 to 19 °C). At the lower elevations below 5,000 feet (1,500 m), temperatures are hotter; the mean daily high temperature at Yosemite Valley (elevation 3,966 feet / 1,209 metres) varies from 46 to 90 °F (8 to 32 °C). At elevations above 8,000 feet (2,400 m), the hot, dry summer temperatures are moderated by frequent summer thunderstorms, along with snow that can persist into July. The combination of dry vegetation, low relative humidity, and thunderstorms results in frequent lightning-caused fires as well.^[22]

At the park headquarters, with an elevation of 3,966 feet (1,209 m), January averages 37.7 °F (3.2 °C), while July averages 72.7 °F (22.6 °C), though in summer the nights are much cooler than the hot days. There are an average of 46 days with highs of 90 °F (32 °C) or higher and an average of 122 nights with freezing temperatures. Freezing temperatures have been recorded in every month of the year. The record high temperature was 115 °F (46 °C) on July 20, 1915, while the record low temperature was −6 °F (−21 °C) on January 2, 1924. Average annual precipitation is nearly 38 inches (965 mm), falling on 71 days. The wettest year was 1983 with 68.94 inches (1,751 mm) and the dryest year was 1976 with 14.84 inches (377 mm). The most precipitation in one month was 29.61 inches (752 mm) in December 1955 and the most in one day was 6.92 inches (176 mm) on December 23, 1955. Average annual snowfall is 65.6 inches (1.67 m). The snowiest year was 1967 with 154.9 inches (3.93 m). The most snow in one month was 140.8 inches (3.58 m) in January 1993.^[23]

The Valley's attractions : The Yosemite Valley is only a tiny fraction of Yosemite, but contains the most famous attractions: Half Dome (second best view at the end of a famous trail) Upper Yosemite Falls (among the tallest waterfalls in the world) El Capitan (single largest block of granite in the world) Mist Trail (Vernal & Nevada Falls) Glacier Point Mirror Lake to Snowcreek Falls to North Dome to Upper Falls Mariposa Grove (huge sequoias) Tenaya Lake to Clouds Rest to Half Dome to Yosemite Valley (Clouds Rest has one of the best views in the entire park) North Dome Tioga Road (Ten Lakes trailhead) to Yosemite Falls (18 kms) to Yosemite Valley (5.6 kms) via the Yosemite Creek trail

Photos Non-valley Attractions The rest of Yosemite is huge and contains truly spectacular wilderness. Epic hikes: Ten Lakes & May Lake Tenaya Lake to Clouds Rest to Yosemite Valley Mt Dana (the second highest peak in Yosemite) Mt Conness Saddlebag Lake to McCabe lakes To Tuolumne Meadows Mt Lyell (the highest peak in Yosemite) Tenaya Canyon Cathedral Lake Tuolumne and Waterwheel Falls From Tuolumne Meadows to Saddlebag Lake Waterwheel Falls Buena Vista Peak loop Wawona to Glacier Point road via Chilnualna Falls Pohono trail Upper Yosemite Falls (Yosemite, 11kms, strenuous) - tallest waterfalls in the Us Trails from Tuolumne Meadows or Tenaya Lake Resources Yosemite is one of the least friendly parks in the world. It is terribly difficult to get any kind of information, and almost impossible to speak to a human being. In most cases, the only way to get even the simpler piece of information is to drive to the park. Pictures of Yosemite Yosemite National Park Yosemite's web site Yosemite's Twitter blog Hikes in Yosemite Live webcams Campgrounds Camping reservations Bears and Lions Weather for Yosemite Valley (WRH) Weather for Yosemite High Country (WRH) Road and trail conditions Yosemite Valley attractions In a sign of the continuing decline of the USA, there is no public transportation (not even an old-fashioned bus, let alone a Japanese/European-style bullet train) to this popular destination. If you are a tourist, you need to rent a car or book a super-expensive tour. It is also a sign of how much the USA cares for pollution, greenhouse gases and oil consumption that it forces everybody to drive their own cars to a popular natural attraction. Directions from the Bay Area Take the I-580 EAST towards (I-880)/STOCKTON Take I-205 E towards TRACY/STOCKTON. You will be forced to take the I-5 NORTH exit Pay close attention because you have to exit almost immediately to direction CA-120 RAMP towards MANTECA/SONORA Now you are on 120, a road with traffic lights (ignore any exit called Yosemite Ave) At some point you will be forced to take the CA-99 NORTH Pay close attention because you have to exit almost immediately to direction CA-120 East towards Yosemite Turn RIGHT onto CA-120 East This will take you to Escalante and then Oakdale. Oakdale is a good place to get gasoline. When you enter Oakdale, pay close attention because you have to turn LEFT at the main intersection towards SR-120/108 About 20 minutes after leaving Oakdale, pay close attention again because you have to turn right into 120 East (this is where 108 and 120 split, with 108 going to Sonora and 120 going to Yosemite). If you miss this turn, you'll end up in Sonora. After you make this RIGHT turn, the road is much faster. In less than 15 minutes you will pass the town of Moccasin. If you are driving a small car and you are not using A/C, turn RIGHT into Old Priest Rd, which is a significant shortcut (but extremely steep). Overheating is very common on this road for bad USA-made cars running A/C. At the top continue straight onto 120 to Groveland, which is the last main town before Yosemite (and the last decent restaurants) Twenty minutes later you will pass the last gas station on your right. Ten minutes later you will pass the last motel (Yosemite Gateway) on your right. And one minute later you will see the sign "Yosemite National Park" and the entrance station.

[edit] History

[edit] Ahwahneechee and the Mariposa Wars

Paiute ceremony in 1872 at current site of Yosemite Lodge.

Paiute and Sierra Miwok peoples lived in the area for a long time before the first white explorations into the region. A band of Native Americans called the Ahwahneechee lived in Yosemite Valley when the first non-indigenous people entered it.^[25]

The California Gold Rush in the mid-19th century dramatically increased white travel in the area. United States Army Major Jim Savage led the Mariposa Battalion into the west end of Yosemite Valley in 1851 while in pursuit of around 200 Ahwahneechees led by Chief Tenaya as part of the Mariposa Wars.^[26]

Dr Lafayette Bunnell named many of the features in the area of the park, including Yosemite Valley.

Accounts from this battalion were the first well-documented cases of Caucasians entering Yosemite Valley. Attached to Savage's unit was Dr. Lafayette Bunnell, the company physician, who later wrote about his awestruck impressions of the valley in The Discovery of the Yosemite. Bunnell is credited with naming Yosemite Valley from his interviews with Chief Tenaya. Bunnell wrote that Chief Tenaya was the founder of the Pai-Ute Colony of Ah-wah-nee.^[25] The Miwoks (and most white settlers) considered the Ahwahneechee to be especially violent because of their frequent territorial disputes, and the Miwok word "yohhe'meti" literally means "they are killers".^[27][28] Correspondence and articles written by members of the battalion helped to popularize Yosemite Valley and surrounding area.

Tenaya and the rest of the Ahwahneechee were eventually captured and their village burned; they were removed to a reservation near Fresno, California. Some were later allowed to return to Yosemite Valley, but got in trouble after attacking a group of eight gold miners in the spring of 1852.^[29] The band fled eastward to Mono Lake, and took refuge with the nearby Mono tribe; but after stealing some horses from their hosts, the Ahwahneechees were tracked down and killed by the Mono Paiutes in 1853. In the attack Chief Tenaya was killed and the survivors were taken back to Mono Lake and absorbed into the Mono Lake Paiute tribe. A reconstructed "Indian Village of Ahwahnee" is now located behind the Yosemite Museum, which is next to the Yosemite Valley Visitor Center.

[edit] Early tourists tour the area.^[26] Hutchings and Ayers were responsible for much of the earliest publicity about Yosemite, creating articles and entire magazine issues about the Valley.^[30] Ayres' highly detailed angularly exaggerated artwork and his written accounts were distributed nationally and an art exhibition of his drawings was held in New York City. Hutchings publicity efforts between 1855 and 1860 led to an increase in Yosemite tourism.^[31]

Wawona was an Indian encampment in what is now the southwestern part of the park. Settler Galen Clark discovered the Mariposa Grove of Giant Sequoia in Wawona in 1857. Simple lodgings were built, as were roads to the area. In 1879, the Wawona Hotel was built to serve tourists visiting Mariposa Grove. As tourism increased, so did the number of trails and hotels.

The Wawona Tree, also known as the Tunnel Tree, was a famous giant sequoia that stood in the Mariposa Grove. It was 227 feet (69 m) tall, and was 90 ft (27 m) in circumference. A tunnel was cut through the tree in 1881, which made it a popular tourist photo attraction. Everything from horse-drawn carriages in the late 19th century, to automobiles in the first part of the 20th century, traveled the road which passed through that tree. The Wawona Tree fell in 1969 under a heavy load of snow. It was estimated to have been 2,300 years old.

Galen Clark

Concerned by the effects of commercial interests, prominent citizens including Galen Clark and Senator John Conness advocated for protection of the area. A park bill was prepared with the assistance of the General Land Office in the Interior Department.^[32] The bill passed both houses of the 38th United States Congress, and was signed by President Abraham Lincoln on June 30, 1864, creating the Yosemite Grant.^[33][34] This is the first instance of park land being set aside specifically for preservation and public use by action of the U.S. federal government, and set a precedent for the 1872 creation of Yellowstone as the first national park.^[7] Yosemite Valley and the Mariposa Grove were ceded to California as a state park, and a board of commissioners was proclaimed two years later.

Galen Clark was appointed by the commission as the Grant's first guardian, but neither Clark nor the commissioners had the authority to evict homesteaders (which included Hutchings).^[33] The issue was not settled until 1872 when the homesteader land holdings were invalidated by the U.S. Supreme Court.^[35] Clark and the reigning commissioners were ousted in 1880, this dispute also reaching the Supreme Court in 1880 .^[36] The two Supreme Court decisions affecting management of the Yosemite Grant are considered import precedents in land management law .^[37] Hutchings became the new park guardian.^[38]

Access to the park by tourists improved in the early years of the park, and conditions in the Valley were made more hospitable. Tourism significantly increased after the First Transcontinental Railroad was completed in 1869, but the long horseback ride to reach the area was a deterrent.^[33] Three stagecoach roads were built in the mid-1870s to provide better access for the growing number of visitors to Yosemite Valley.

Scottish-born naturalist John Muir wrote articles popularizing the area and increasing scientific interest in it. Muir was one of the first to theorize that the major landforms in Yosemite Valley were created by large alpine glaciers, bucking established scientists such as Josiah Whitney, who regarded Muir as an amateur.^[38] Muir wrote scientific papers on the area's biology.

[edit] Increased protection efforts

Theodore Roosevelt and John Muir on Glacier Point.

Overgrazing of meadows (especially by sheep), logging of Giant Sequoia, and other damage caused Muir to become an advocate for further protection. Muir convinced prominent guests of the importance of putting the area under federal protection; one such guest was Robert Underwood Johnson, editor of Century Magazine. Muir and Johnson lobbied Congress for the Act that created Yosemite National Park on October 1, 1890.^[39] The State of California, however, retained control of Yosemite Valley and Mariposa Grove. Muir also helped persuade local officials to virtually eliminate grazing from the Yosemite high country.

The newly created national park came under the jurisdiction of the United States Army's Fourth Cavalry Regiment on May 19, 1891, which set up camp in Wawona.^[39] By the late 1890s, sheep grazing was no longer a problem, and the Army made many other improvements. The Cavalry could not intervene to help the worsening condition of Yosemite Valley and Mariposa Grove. The cavalry left another legacy in the park, the ranger hat. In 1899 Cavalry and Infantry troopers, including the all Black 9th Cavalry, (known as the "Buffalo Soldiers,") were stationed at Yosemite and brought with them the trooper's hat with the distinctive Montana Peak we recognise today as the "ranger hat." This peak had been formed into the trooper's stetson by veterans of the 1898 Spanish American War to better shed tropical rain.

Muir and his Sierra Club continued to lobby the government and influential people for the creation of a unified Yosemite National Park. In May 1903, President Theodore Roosevelt camped with Muir near Glacier Point for three days. On that trip, Muir convinced Roosevelt to take control of Yosemite Valley and Mariposa Grove away from California and return it to the federal government. In 1906, Roosevelt signed a bill that did precisely that.

[edit] U.S. National Park Service

The National Park Service was formed in 1916, and Yosemite was transferred to that agency's jurisdiction. Tuolumne Meadows Lodge, Tioga Pass Road, and campgrounds at Tenaya and Merced lakes were also completed in 1916.^[40] Automobiles started to enter the park in ever-increasing numbers following the construction of all-weather highways to the park. The Yosemite Museum was founded in 1926 through the efforts of Ansel Franklin Hall.^[41]

O'Shaughnessy Dam in Hetch Hetchy Valley

In 1903, a dam in the northern portion of the park was proposed. Located in the Hetch Hetchy Valley, its purpose was to provide water and hydroelectric power to San Francisco. Preservationists like Muir and his Sierra Club opposed the project, while conservationists like Gifford Pinchot supported it.^[42] In 1913, the U.S. Congress authorized the O'Shaughnessy Dam through passage of the Raker Act.^[43]

In the late 1920s, in an attempt that would be impossible to make today, a bid for Yosemite for the 1932 Winter Olympics was put forward. ^[44] (Ultimately, Lake Placid, New York hosted.) ^[44]

More recently, preservationists persuaded Congress to designate 677,600 acres (274,200 ha), or about 89% of the park, as the Yosemite Wilderness—a highly protected wilderness area.^[45] The Park Service has reduced artificial inducements to visit the park, such as the Firefall, in which red-hot embers were pushed off a cliff near Glacier Point at night. Traffic congestion in Yosemite Valley during the summer months has become a concern. Two electric buses commenced service in September 1995. The buses are quiet and do not emit pollutants. Eventually, all the buses in Yosemite will be electric.^[46] Plans to exclude all automobiles in the summer that are not registered at a hotel or campground within Yosemite Valley have been investigated; this would put summer day-use visitors in the valley on free shuttle buses, bicycles, or on foot. The 1996 Yosemite Valley Landslide killed a hiker and the January 1997 Merced River flood damaged many roads and several campgrounds.

After a storm from March 19–20, 2011, the Park and roads in and around it were closed.^[47] It was the first time in fifteen years the park had entirely ceased operations.^[48] Power was out in Yosemite Valley and convoys escorted tourists out of the Park.^[49] Power was finally restored to Yosemite on Sunday, March 27.^[50]

[edit] Geology

[edit] Tectonic and volcanic activity

Generalized geologic map of the Yosemite area (USGS image)

The area of the park was astride a passive continental margin during the Precambrian and early Paleozoic.^[51] Sediment was derived from continental sources and was deposited in shallow water. These rocks have since been metamorphosed.

Heat generated from the Farallon Plate subducting below the North American Plate led to the creation of an island arc of volcanoes on the west coast of proto-North America between the late Devonian and Permian periods.^[51] Later volcanism in the Jurassic intruded and covered these rocks in what may have been magmatic activity associated with the early stages of the creation of the Sierra Nevada Batholith. 95% of these rocks were eventually removed by uplifted-accelerated erosion.

The first phase of regional plutonism started 210 million years ago in the late Triassic and continued throughout the Jurassic to about 150 million years before present (BP).^[9] Around the same time, the Nevadan orogeny built the Nevadan mountain range (also called the Ancestral Sierra Nevada) to a height of 15,000 feet (4,600 m). This was directly part of the creation of the Sierra Nevada Batholith, and the resulting rocks were mostly granitic in composition and emplaced about 6 miles (9.7 km) below the surface.^[52] The second major pluton emplacement phase lasted from about 120 million to 80 million years ago during the Cretaceous.^[9] This was part of the Sevier orogeny.

Starting 20 million years ago (in the Cenozoic) and lasting until 5 million years ago, a now-extinct extension of Cascade Range volcanoes erupted, bringing large amounts of igneous material in the area. These igneous deposits blanketed the region north of the Yosemite region. Volcanic activity persisted past 5 million years BP east of the current park borders in the Mono Lake and Long Valley areas.

[edit] Uplift and erosion

Starting 10 million years ago, vertical movement along the Sierra fault started to uplift the Sierra Nevada. Subsequent tilting of the Sierra block and the resulting accelerated uplift of the Sierra Nevada increased the gradient of western-flowing streams.^[53] The streams consequently ran faster and thus cut their valleys more quickly. Additional uplift occurred when major faults developed to the east, especially the creation of Owens Valley from Basin and Range-associated extensional forces. Uplift of the Sierra accelerated again about two million years ago during the Pleistocene.

Exfoliation joints have modified the near-surface portions of massive granitic rocks in the park, helping create the many spectacular domes, including Half Dome shown here.

The uplifting and increased erosion exposed granitic rocks in the area to surface pressures, resulting in exfoliation (responsible for the rounded shape of the many domes in the park) and mass wasting following the numerous fracture joint planes (cracks; especially vertical ones) in the now solidified plutons.^[14] Pleistocene glaciers further accelerated this process and the larger ones transported the resulting talus and till from valley floors.

Numerous vertical joint planes controlled where and how fast erosion took place. Most of these long, linear and very deep cracks trend northeast or northwest and form parallel, often regularly spaced sets. They were created by uplift-associated pressure release and by the unloading of overlying rock via erosion.

[edit] Sculpting by glaciers

A series of glaciations further modified the region starting about 2 to 3 million years ago and ending sometime around 10,000 BP. At least four major glaciations have occurred in the Sierra Nevada, locally called the Sherwin (also called the pre-Tahoe), Tahoe, Tenaya, and Tioga.^[53] The Sherwin glaciers were the largest, filling Yosemite and other valleys, while later stages produced much smaller glaciers. A Sherwin-age glacier was almost surely responsible for the major excavation and shaping of Yosemite Valley and other canyons in the area.

Glacial systems reached depths of up to 4,000 feet (1,200 m) and left their marks in the Yosemite area. The longest glacier in the Yosemite area ran down the Grand Canyon of the Tuolumne River for 60 miles (97 km), passing well beyond Hetch Hetchy Valley. Merced Glacier flowed out of Yosemite Valley and into the Merced River Gorge. Lee Vining Glacier carved Lee Vining Canyon and emptied into Lake Russel (the much-enlarged ice age version of Mono Lake). Only the highest peaks, such as Mount Dana and Mount Conness, were not covered by glaciers. Retreating glaciers often left recessional moraines that impounded lakes such as the 5.5 miles (9 km) long Lake Yosemite (a shallow lake that periodically covered much of the floor of Yosemite Valley).^[54]

View from Glacier Point

[edit] Biology

[edit] Habitats

Mule Deer in Yosemite Valley

With its scrubby sun-baked chaparral, stately groves of pine, fir, and sequoia, and expanses of alpine woodlands and meadows, Yosemite National Park preserves a Sierra Nevada landscape as it prevailed before Euro-American settlement.^[55] In contrast to surrounding lands, which have been significantly altered by logging, the park still contains some 225,510 acres (91,260 ha) of old-growth forest.^[56] Taken together, the park's varied habitats support over 250 species of vertebrates, which include fish, amphibians, reptiles, birds, and mammals.^[57]

Along much of Yosemite's western boundary, habitats are dominated by mixed coniferous forests of Ponderosa Pine, Sugar Pine, Incense-cedar, White Fir, Douglas Fir, and a few stands of Giant Sequoia, interspersed by areas of Black Oak and Canyon Live Oak. A relatively high diversity of wildlife species are supported by these habitats, because of relatively mild, lower-elevation climate and the mixture of habitat types and plant species. Wildlife species typically found in these habitats include American black bear, Bobcat, Cougar, Gray fox, Mule deer, Mountain kingsnake, Gilbert's skink, White-headed Woodpecker, Brown Creeper, Spotted Owl, and a wide variety of bat species. In the case of bats, large snags are important as roost sites.^[57]

Going higher in elevation, the coniferous forests become purer stands of Red Fir, Western White Pine, Jeffrey Pine, Lodgepole Pine, and the occasional Foxtail pine. Fewer wildlife species tend to be found in these habitats, because of their higher elevation and lower complexity. Species likely to be found include Golden-mantled Ground Squirrel, Chickaree, Fisher, Steller's Jay, Hermit Thrush, and Northern Goshawk. Reptiles are not common, but include Rubber Boa, western fence lizard, and Northern Alligator Lizard.^[57]

Marmot (Marmota flaviventris) on top of Mount Dana

As the landscape rises, trees become smaller and more sparse, with stands broken by areas of exposed granite. These include Lodgepole Pine, Whitebark Pine, and Mountain Hemlock that, at highest elevations, give way to vast expanses of granite as treeline is reached. The climate in these habitats is harsh and the growing season is short, but species such as Pika, Yellow-bellied Marmot, White-tailed Jackrabbit, Clark's Nutcracker, and Black Rosy Finch are adapted to these conditions. Also, the treeless alpine habitats are the areas favored by Sierra Nevada Bighorn Sheep. This species, however, is now found in the Yosemite area only around Tioga Pass, where a small, reintroduced population exists.^[57]

At a variety of elevations, meadows provide important, productive habitat for wildlife. Animals come to feed on the green grasses and use the flowing and standing water found in many meadows. Predators, in turn, are attracted to these areas. The interface between meadow and forest is also favored by many animal species because of the proximity of open areas for foraging and cover for protection. Species that are highly dependent upon meadow habitat include Great Grey Owl, Willow Flycatcher, Yosemite Toad, and Mountain Beaver.^[57]

[edit] Management issues

An American Black Bear with a conspicuous ear tag browsing on its natural foods in Yosemite Valley

Despite the richness of high-quality habitats in Yosemite, the Brown Bear, California Condor, and Least Bell's Vireo have become extinct in the park within historical time,^[58] and another 37 species currently have special status under either California or federal endangered species legislation. The most serious current threats to Yosemite's wildlife and the ecosystems they occupy include loss of a natural fire regime, exotic species, air pollution, habitat fragmentation, and climate change. On a more local basis, factors such as road kills and the availability of human food have affected some wildlife species.

Plants such as this Yellow Star Thistle are competing with native plants in Yosemite.

The black bears of Yosemite were once famous for breaking into parked cars to steal food. They were also an encouraged tourist sight for many years at the park's garbage dumps, where bears congregated to eat park visitors' garbage and tourists gathered to photograph the bears. Increasing encounters between bears and humans and increasing damage to property led to an aggressive campaign to discourage bears from relying on human food or interacting with people and their property. The open-air dumps were closed; all trash receptacles were replaced with bear-proof receptacles; all campgrounds were equipped with bear-proof food lockers so that people would not leave food in their vehicles, which were easy targets for the powerful and resourceful bears. Because bears who show aggression towards people usually are eventually destroyed, park personnel have continued to come up with innovative ways to have bears associate humans and their property with unpleasant experiences, such as being hit with rubber bullets. Today, about 30 bears a year are captured and ear-tagged and their DNA is sampled so that, when bear damage occurs, rangers can ascertain which bear is causing the problem.^[59]

Increasing ozone pollution is causing tissue damage to the massive Giant Sequoia trees in the park. This makes them more vulnerable to insect infestation and disease. Since the cones of these trees require fire-touched soil to germinate, historic fire suppression has reduced these trees' ability to reproduce. The current policy of setting prescribed fires is expected to help the germination issue.

Yosemite National Park has documented more than 130 non-native plant species within park boundaries. These non-native plants were introduced into Yosemite following the migration of early Euro-American settlers in the late 1850s. Natural and human-caused disturbances, such as wildland fires and construction activities, have contributed to a rapid increase in the spread of non-native plants. A number of these species aggressively invade and displace the native plant communities, resulting in impacts on the park's resources. Non-native plants can bring about significant changes in park ecosystems by altering the native plant communities and the processes that support them. Some non-native species may cause an increase in the fire frequency of an area or increase the available nitrogen in the soil that may allow more non-native plants to become established. Many non-native species, such as Yellow Star Thistle (Centaurea solstitialis), are able to produce a long tap root that allows them to out-compete the native plants for available water.^[60]

Bull Thistle (Cirsium vulgare), Common Mullein (Verbascum thapsus), and Klamath Weed (Hypericum perforatum) have been identified as noxious pests in Yosemite since the 1940s. Additional species that have been recognized more recently as aggressive and requiring control are Yellow Star Thistle (Centaurea solstitialis), Sweet Clover (Melilot spp.), Himalayan Blackberry (Rubus armeniacus), Cut-leaved Blackberry (Rubus laciniatus) and Large Periwinkle (Vinca major).^[60]

[edit] Activities

The Yosemite Hybrid Shuttle, Yosemite's free shuttle bus system

Yosemite Valley is open year-round, but much of the remaining park is closed because of snow in late autumn and re-opens in mid to late spring. Open-air tours around Yosemite Valley and the Mariposa Grove of Giant Sequoias are available. Many people enjoy short walks and longer hikes to waterfalls in Yosemite Valley, or walks amongst Giant Sequoias in the Mariposa, Tuolumne, or Merced Groves. Others like to drive or take a tour bus to Glacier Point (summer-fall) to see a spectacular view of Yosemite Valley and the high country, or drive along the scenic Tioga Road to Tuolumne Meadows (summer-fall) and go for a walk or hike.

Most park visitors stay just for the day, and only visit locations within Yosemite Valley that are easily accessible by automobile. There is a US$20 per automobile user fee to enter the park.^[61] Traffic congestion in the valley is a serious problem during peak season, in summer. A free shuttle bus system operates year-round in the valley, and park rangers encourage people to use this system since parking within the valley during the summer is often nearly impossible to find.^[62]

In addition to exploring the natural features of the park, visitors can also learn about the natural and cultural history of Yosemite Valley at a number of facilities in the valley: the Yosemite Valley Visitor Center, the adjoining Yosemite Museum, and the Nature Center at Happy Isles. There are also two National Historic Landmarks: the LeConte Memorial Lodge (Yosemite's first public visitor center), and the world-famous Ahwahnee Hotel. Camp 4 was added to the National Register of Historic Places in 2003.^[63]

[edit] Hiking

Over 800 miles (1,300 km) of trails are available to hikers^[5]—anything from the easy stroll, to the grueling hikes up several park mountains, to multiple-day backpack trips.

The park can be divided into 5 sections for the day-user—Yosemite Valley, Wawona/Mariposa Grove/ Glacier Point, Tuolumne Meadows, Hetch Hetchy, and Crane Flat/White Wolf. Numerous books describe park trails, and free information is available from the Park Service in Yosemite. Park rangers encourage visitors to experience portions of the park in addition to Yosemite Valley.

Between late spring and early fall, much of the park is open to multiple-day backpack trips. All overnight trips into the back country require a wilderness permit^[64] and most require approved bear-resistant food storage.^[65]

[edit] Driving destinations

Dana Fork of the Tuolumne River, near the Tioga Pass entrance

While some locations in Yosemite require hiking, other locations can be observed via automobile transportation. Driving locations also allow guests to observe the night sky in locations other than their campsite or lodge. All of the roads in Yosemite are scenic, but the most famous is the Tioga Road, typically open from late May or early June through November.^[66]

As an alternative to driving, bicycles are allowed on the roads. However, bicycles are only allowed off-road on 12 miles (19 km) of paved trails in Yosemite Valley itself; mountain biking is not allowed.^[67]

[edit] Climbing

Rock climbing is an important part of Yosemite.^[68] Camp 4, a walk-in campground in Yosemite Valley, was instrumental in the development of rock climbing as a sport, and is listed on the National Register of Historic Places.^[69] Climbers can generally be spotted in the snow-free months on anything from ten-foot-high (3 m) boulders to the 3,300-foot (1.0 km) face of El Capitan. Classes are offered by numerous groups on rock climbing.

[edit] Winter activities

A ranger-guided snowshoe walk in the park

Many of the roads in the park close because of heavy snow in winter; however, Yosemite Valley is open all year long. Downhill skiing is available at the Badger Pass Ski Area—the oldest downhill skiing area in California, offering downhill skiing from mid-December through early April.^[70] Much of the park is open to cross-country skiing and snowshoeing, with several backcountry ski huts open for use.^[71][72] Wilderness permits are required for backcountry overnight ski trips.^[64]

The Bracebridge dinner is an annual holiday event, held since 1927 at the Ahwahnee Hotel, inspired by Washington Irving's descriptions of Squire Bracebridge and English Christmas traditions of the 18th century in his Sketch Book. Between 1929 and 1973, the show was organized by Ansel Adams.^[73]

[edit] Other

Bicycle rentals are available in Yosemite Valley spring through fall. Over 12 miles (19 km) of paved bike paths are available in Yosemite Valley. In addition, bicyclists can ride on regular roads. Helmets are required by law for children under 18 years of age. Off-trail riding and mountain biking are not permitted in Yosemite National Park.^[74]

Water activities are plentiful during warmer months. Rafting can be done through the Yosemite Valley on the Merced River. There is also a swimming pool available at Curry Village.

In 2010, Yosemite National Park was honored with its own quarter under the America the Beautiful Quarters program.^[75]

• African-American Heritage Sites (U.S. National Park Service)
• Buffalo Soldier
• Fauna of the Sierra Nevada (U.S.)
• List of books for further reading about the Sierra Nevada
• List of plants of the Sierra Nevada (U.S.)
• List of Yosemite waterfalls
• National Register of Historic Places in Yosemite National Park
• Yosemite West, a community inside the gates of YNP
• Chinquapin,_California

[edit] Notes

[edit] References

• Harris, Ann G. Geology of National Parks: Fifth Edition. (Iowa, Kendall/Hunt Publishing; 1998) ISBN 0-7872-5353-7.
• Kiver, Eugene P. and David V. Harris. Geology of U.S. Parklands: Fifth Edition. (John Wiley & Sons; New York; 1999) ISBN 0-471-33218-6.
• Schaffer, Jeffrey P. Yosemite National Park: A Natural History Guide to Yosemite and Its Trails. (Wilderness Press, Berkeley; 1999) ISBN 0-89997-244-6.
• Wuerthner, George. Yosemite: A Visitor's Companion. (Stackpole Books; 1994) ISBN 0-8117-2598-7.
• Yosemite: Official National Park Service Handbook (no. 138), Division of Publications, National Park Service.
• This article incorporates public domain material from websites or documents of the National Park Service.
  • Climate (22 December 2004) Retrieved on January 27, 2007
  • Exotic Vegetation (22 December 2004) Retrieved on January 27, 2007
  • Nature & History (13 October 2006) Retrieved on January 27, 2007
  • Water Resources Overview (22 December 2004) Retrieved on January 27, 2007
  • Wildlife Overview (22 December 2004) Retrieved on January 27, 2007
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Yosemite National Park
Founded in 1890 • Based in Tuolumne, Madera, and Mariposa Counties in California Yosemite National Park

Yosemite Valley • Yosemite Village _(CDP) • Hetch Hetchy _{(valley, dam)} • Glacier Point • Badger Pass • Mariposa Grove of Giant Sequoias • Tuolumne Meadows • Tioga Pass • Wawona _{(community, hotel, tree)} • Chilnualna Falls

Valley attractions
Half Dome • Yosemite Falls • El Capitan • Bridalveil Fall • Happy Isles • Mirror Lake • North Dome • Vernal Fall • Nevada Fall • Little Yosemite Valley • LeConte Lodge • Camp Curry • The Ahwahnee • Bracebridge Dinner • Yosemite Firefall _{(defunct attraction)}
Hiking trails
Yosemite Falls • Bridalveil Falls • Half Dome • Mist Trail • Panorama Trail _{(Glacier Point)} • Mirror Lake • McGurk Meadow • Ostrander Lake • Mono Meadow • Taft Point • Sentinel Dome • Chilnualna Falls • Alder Creek • Mariposa Grove • Wapama Falls • Rancheria Falls • Soda Springs • Dog Lake • Lembert Dome • Elizabeth Lake • Cathedral Lakes • Mono Pass • Gaylor Lakes • Vogelsang • John Muir Trail
People
John Muir • Stephen T. Mather • Galen Clark • David Curry • Shelton Johnson • Buffalo Soldiers • Chief Tenaya • Ahwahnechee people
Lodging *

Yosemite Lodge at the Falls • The Ahwahnee • Camp Curry • Wawona Hotel • White Wolf Lodge • Housekeeping Camp • High Sierra Camps

Dining	The Ahwahnee Dining Room • Mountain Broiler Room • Lodge Cafeteria • Wawona Hotel Dining Room • Curry Village Pizza Parlor	Natural Disasters	Flood (1997, Merced River) • Rockfalls (1996, 2008, 2009)
Transportation	Nearby airports: FAT, MPI, MMH • YARTS • Route 140 • Route 41 • Route 120 • Hetch Hetchy Road • Glacier Point Road
Nearby Municipalities	Foresta • El Portal & Arch Rock Entrance • Yosemite West & Chinquapin • Bootjack • Mariposa • Briceburg • Oakhurst • Midpines • Lee Vining • Mammoth • Merced • Le Grand • Chowchilla
Additional Information	History of the Yosemite area • Geology of the Yosemite area • National Register of Historic Places in Yosemite National Park • Waterfalls(list, template)
Category •     Tthis blog continues on page  185  http://www.greatdreams.com/blog-2012/dee-blog185.html