Yosemite National Park

A Shrine to Nature’s Majesty

Yosemite National Park stands not merely as a tract of protected land but as a global icon, a testament to the profound beauty and power of the natural world. It is, as described in its founding documents, a shrine – a place revered for its soaring granite cliffs, the thunderous power of its waterfalls, the ancient wisdom embodied in its giant sequoias, and the serene tranquility of its vast High Sierra wilderness.¹ First protected by the visionary Yosemite Grant signed by President Abraham Lincoln in 1864, amidst the turmoil of the Civil War, Yosemite predates even the formal concept of a national park in the United States, laying the groundwork for a system dedicated to preserving such treasures “inalienable for all time”.¹

Encompassing nearly 1,200 square miles (approximately 750,000 acres or 3,080 square kilometers) in the heart of California’s Sierra Nevada mountain range, Yosemite offers a staggering diversity of landscapes and life.³ While Yosemite Valley, with its iconic features like El Capitan and Half Dome, captures the imagination of millions, it represents only a small fraction of the park’s expanse.⁹ Beyond the Valley lie deep canyons carved by ancient rivers, grand subalpine meadows bursting with seasonal wildflowers, groves of the most massive trees on Earth, and a designated wilderness area covering about 95% of the park, offering solitude and challenge.²

Designated a UNESCO World Heritage site in 1984, Yosemite is internationally recognized not only for its dramatic geology – the result of tectonic forces, volcanic activity, and extensive glaciation acting upon resilient granite – but also for its clear streams, biological diversity spanning multiple life zones, and the profound human history etched into its landscape.² From the ancestral homelands of the Miwok and Paiute people to the arrival of European-Americans, the passionate advocacy of conservationists like John Muir, and the ongoing efforts to manage this cherished resource, Yosemite’s story is as layered and complex as its geology.²

This guide delves into the multifaceted nature of Yosemite National Park, exploring its geological origins, geographical features, human history, paleontological context, rich biodiversity, current management practices, and essential information for planning a visit. It aims to provide a comprehensive understanding of this extraordinary place, fostering appreciation for its past, present, and the critical need for its continued preservation for generations to come.

The Geological Tapestry

The breathtaking landscape of Yosemite National Park, characterized by its towering granite cliffs, plunging waterfalls, and dramatic U-shaped valleys, is the product of immense geological forces acting over hundreds of millions of years. Uplift, erosion, subduction, volcanism, and, most profoundly, glaciation have sculpted the unique scenery that inspires millions of visitors annually.¹⁹ Understanding the geological story is key to appreciating the park’s iconic features.

A. Bedrock Foundations: Granite, Metamorphics, and Volcanics

Yosemite’s geological foundation is predominantly composed of granitic rocks, part of the vast Sierra Nevada Batholith.⁹ A batholith is a massive complex of individual plutons – large bodies of molten rock (magma) that intruded deep within the Earth’s crust and cooled slowly over millions of years, never reaching the surface to erupt as volcanoes.²⁰ This slow cooling allowed large, interlocking mineral crystals to form, giving granite its characteristic salt-and-pepper appearance.¹⁹

The primary minerals composing Yosemite’s granitic rocks include quartz, plagioclase feldspar, potassium feldspar (orthoclase), biotite mica, and hornblende.¹⁹ Variations in the original magma composition and the cooling process resulted in several types of granitic rock within the batholith, including true granite, granodiorite (like Half Dome), tonalite, and diorite.²⁰ While geologically distinct, these are often collectively referred to as “granitic rocks”.²⁰ The specific type of granitic rock influences its appearance, texture, and how it responds to weathering and erosion, contributing to the varied forms of Yosemite’s cliffs and domes.²⁰ For example, the massive, largely unjointed El Capitan Granite forms the sheer cliff face of El Capitan, while the Half Dome Granodiorite exhibits exfoliation features.¹⁹ Some granitic units, like the Cathedral Peak Granodiorite, contain large potassium feldspar crystals (phenocrysts) embedded in a finer matrix, providing texture useful to rock climbers.²³

Remnants of older rocks, predating the granitic intrusions, also exist within the park. These are primarily metamorphic rocks, originally sedimentary and volcanic materials deposited on the seafloor near the ancient edge of the North American continent roughly 400-500 million years ago.¹⁰ These ancient limestones, sandstones, shales, and submarine volcanic deposits were later altered by the intense heat and pressure associated with tectonic plate collisions and the intrusion of the batholith, transforming them into rocks like marble, quartzite, and schist.¹⁹ These metamorphic rocks, often found as “roof pendants” (remnants of the rock that once formed the “roof” above the cooling magma), occur in northwest-trending belts primarily on the western and eastern margins of the park’s granitic core.⁹ Examples include the Shoo Fly and Calaveras Complexes on the western side.¹⁹

Younger volcanic rocks represent a later chapter in Yosemite’s geological story. While much of the volcanic material associated with the ancient subduction zone eroded away, some evidence remains.¹⁹ Between approximately 20 and 5 million years ago, renewed volcanic activity, particularly north and east of the current park boundaries, deposited layers of lava flows and ash (tuff).¹⁹ Within the park, smaller outcrops of volcanic rocks like basalt, andesite, and latite can be found.¹⁹ A notable example is Little Devils Postpile, west of Tuolumne Meadows, composed of columnar basalt (or more accurately, andesite) formed from a lava flow about 8-9 million years ago.¹⁹ The distinct columns resulted from the rapid cooling and contraction of the thick lava.¹⁹

B. Formation Timeline: Subduction, Intrusion, Uplift, and Erosion

Yosemite’s geological narrative unfolds over vast stretches of time:

1. Ancient Seas and Metamorphism (~500-220 Million Years Ago – Ma): The story begins with sediments and volcanic materials accumulating in shallow seas off the western edge of the North American continent.¹⁰ Tectonic collisions during the Paleozoic and early Mesozoic eras transported these materials eastward and subjected them to heat and pressure, metamorphosing them into the quartzites, marbles, and schists found today primarily along the park’s periphery.¹⁹
2. Subduction and Batholith Formation (~220-85 Ma): Around 220 million years ago, a major shift occurred as the ancient Farallon oceanic plate began to dive (subduct) beneath the westward-moving North American continental plate.¹⁰ This process, similar to the modern Andes, generated immense heat, melting rock deep beneath the surface to form magma.²⁰ This magma rose in pulses over millions of years, intruding into the overlying metamorphic rocks.¹⁹ Much of this magma cooled slowly miles below the surface, crystallizing to form the numerous granitic plutons that collectively make up the Sierra Nevada Batholith.¹⁹ Some magma reached the surface, creating a chain of volcanoes, but these have largely eroded away.¹⁹ The majority of Yosemite’s iconic granitic rocks formed during the Cretaceous period, between 105 and 85 million years ago.¹⁹ Different pulses of magma with varying compositions created the diverse granitic types seen today.²⁰
3. Uplift, Tilting, and Erosion (~85 Ma – Present): After subduction ceased (around 85-65 Ma), the overlying volcanic and metamorphic rocks began to erode away, gradually exposing the resilient granitic batholith beneath.¹⁰ Starting around 10-25 million years ago, the Sierra Nevada region experienced significant uplift and westward tilting.² This uplift, driven by faulting primarily along the eastern edge of the range (associated with the extensional forces of the Basin and Range Province to the east), dramatically increased the gradient of rivers like the Merced and Tuolumne.² These rejuvenated rivers began carving deep, narrow V-shaped canyons into the granite bedrock.² This uplift and erosion process continues today, with the range still rising slowly.¹² As the immense weight of overlying rock was removed, the underlying granite expanded, causing sheets of rock to peel off parallel to the surface – a process called exfoliation. This process played a crucial role in shaping Yosemite’s distinctive rounded domes, like Sentinel Dome and the curved surfaces of Half Dome.¹⁹ Concurrently, weathering along vertical cracks or joints in the granite helped create steeper faces, contributing significantly to the sheer northwest face of Half Dome.¹⁹
4. Volcanic Interlude (~20-5 Ma): During the period of uplift and erosion, renewed, though less extensive, volcanic activity occurred, mainly north and east of the park.¹⁹ Lava flows infiltrated some ancient river canyons, forming features like Little Devils Postpile within the park.¹⁹

C. The Sculpting Hand of Ice: Glaciation’s Impact

While river erosion began carving the Sierra landscape, it was the repeated advance and retreat of massive glaciers during the Pleistocene Epoch (Ice Ages) that sculpted Yosemite into its current, world-renowned form.¹⁰ Starting around 2-3 million years ago, global cooling allowed vast amounts of snow to accumulate in the High Sierra, compacting into ice and forming glaciers.² Over the last 2.6 million years, the Sierra Nevada experienced multiple glacial cycles (at least four major ones recognized locally: Sherwin/pre-Tahoe, Tahoe, Tenaya, and Tioga) interspersed with warmer interglacial periods.¹⁰

• U-Shaped Valleys: The most dramatic impact of glaciation was the transformation of the existing V-shaped river valleys into wide, deep U-shaped valleys.² As glaciers flowed down these canyons, they acted like immense conveyor belts and bulldozers, plucking rocks from the valley walls and floor and grinding the bedrock with embedded debris. The sheer erosive power widened the valleys and steepened their walls. Yosemite Valley itself is the classic example, likely deepened significantly by the earliest and largest (Sherwin-age) glaciers, which may have filled the valley to a depth of 4,000 feet.² Lyell Canyon is another prime example of a glacially carved U-shaped valley.¹⁹
• Hanging Valleys and Waterfalls: Tributary glaciers, flowing into the main valley glaciers, were typically smaller and less erosive.²⁰ When the main glaciers retreated, the floors of these tributary valleys were left perched high above the main valley floor, creating hanging valleys.⁹ Streams flowing through these hanging valleys now plunge spectacularly into the main valley as waterfalls. Yosemite is famous for these, including Yosemite Falls (North America’s highest), Bridalveil Fall, Sentinel Falls, Ribbon Fall (highest single drop), Vernal Fall, and Nevada Fall.⁷ It’s important to note that some hanging valleys in the lower Merced Canyon existed before glaciation, resulting from differing stream erosion rates due to uplift.²⁵
• Domes and Peaks: Glaciers modified existing domes and peaks. Features completely overridden by ice were smoothed and rounded, like Lembert Dome and Sentinel Dome.⁹ Peaks that projected above the ice, like Cathedral Peak and Matterhorn Peak, were sharpened and steepened by glacial quarrying around their bases.¹⁹ Half Dome’s unique shape results from a combination of exfoliation creating its rounded sides, weathering along vertical joints forming its sheer face, and subsequent glacial undercutting and plucking that steepened the face further.¹⁹
• Glacial Polish and Striations: As glaciers moved, rocks embedded in their base acted like sandpaper, grinding and polishing the underlying granite bedrock to a smooth sheen, known as glacial polish, visible in many areas like Tuolumne Meadows and near Lembert Dome.²⁰ Larger rocks dragged by the ice carved linear scratches and grooves, called glacial striations, into the bedrock, indicating the direction of ice flow.²⁰
• Moraines and Erratics: When glaciers melt and retreat, they deposit the rock debris they were carrying. Ridges of this glacial till are called moraines.¹² Lateral moraines form along the sides of a glacier, while terminal moraines mark its furthest advance. Glaciers also transported and deposited isolated boulders, often of a different rock type than the surrounding bedrock; these are known as glacial erratics.²⁰
• Lakes: Glaciers carved out basins in the bedrock which later filled with water to form many of Yosemite’s numerous lakes (tarns), often found in high-elevation cirques (bowl-shaped depressions carved at the head of a glacier).⁹

The most recent major glaciation, the Tioga Glaciation, peaked around 20,000-25,000 years ago and ended by about 15,000 years ago.¹⁰ While small remnant glaciers still exist in high, shaded cirques (like Lyell Glacier, the park’s largest), the landscape we see today is primarily the result of these past glacial episodes acting on the ancient granitic and metamorphic rocks.⁹

D. Ongoing Processes: Shaping Yosemite Today

Yosemite’s landscape is not static; geological processes continue to shape it.

• Uplift and Erosion: The Sierra Nevada continues its slow uplift, estimated at about 1.5 inches (4 cm) per century near Mount Dana, slightly outpacing erosion and leading to a net increase in elevation.¹² Rivers continue to incise valley floors, and weathering continues to break down rock surfaces.¹²
• Rockfalls: Gravity constantly acts on the steep valley walls. Weathering processes, including freeze-thaw cycles and exfoliation driven by daily temperature changes, weaken the rock.²⁴ This leads to frequent rockfalls, ranging from small debris to massive collapses.¹² These events are a natural part of the canyon-shaping process but also pose significant hazards in developed areas.²² USGS and NPS actively monitor rockfall activity using modern techniques like lidar and sensors.²²
• Sedimentation: Sediment eroded from the surrounding slopes slowly fills in alpine lakes and meadows.¹²
• Climate Change Impacts: Warming temperatures are accelerating the melting of Yosemite’s remaining glaciers and altering snowpack dynamics, which will have cascading effects on water resources, ecosystems, and potentially erosion rates.¹²

The geological story of Yosemite is one of immense time scales and powerful forces. The interplay between the resilient granitic bedrock, the relentless processes of uplift and erosion, and the transformative power of ice has created a landscape of unparalleled drama and beauty, recognized as a World Heritage site for its exceptional geological significance.²

Geography

Yosemite National Park encompasses a vast and varied terrain within the central Sierra Nevada mountain range of California. Its geography dictates its climate, ecosystems, and the distribution of its iconic features, influencing everything from wildlife habitats to visitor experiences.

A. Location and Boundaries

Yosemite National Park is situated in east-central California, roughly 140 miles (225 km) east of San Francisco and 100 miles (160 km) southeast of Sacramento.⁷ Its coordinates place it approximately between 37°30′ to 38°11′ North latitude and 119°12′ to 119°53′ West longitude.⁹ The park spans across parts of four counties: Mariposa, Tuolumne, Madera, and Mono.⁹

Covering 1,189 square miles (3,080 sq km) or nearly 750,000 acres, Yosemite is roughly the size of Rhode Island.³ It is bordered by national forest lands on all sides: the Stanislaus National Forest to the northwest, the Sierra National Forest to the southwest, and the Inyo National Forest to the east/southeast.⁷ Adjacent wilderness areas include the Emigrant Wilderness to the north, the Hoover Wilderness to the northeast, and the Ansel Adams Wilderness to the southeast, creating a large, contiguous protected area.² Approximately 95% of Yosemite itself is designated wilderness, affording it the highest level of protection.²

B. Major Regions and Features

Yosemite National Park can be broadly divided into several distinct regions, each with unique characteristics:

• Yosemite Valley: The heart of the park for most visitors, Yosemite Valley is a glacially carved U-shaped canyon approximately 7 miles (11 km) long and 0.5 to 1 mile (0.8 to 1.6 km) wide.⁷ Situated at an elevation of around 4,000 feet (1,209 m) ⁹, it represents only 1% of the park’s total area but contains many of its most famous landmarks: the sheer granite faces of El Capitan and Half Dome, Yosemite Falls, Bridalveil Fall, Vernal Fall, and Nevada Fall.³ The valley floor features meadows, the meandering Merced River, and oak woodlands, contrasting with the towering cliffs.³ Most visitor services, lodging, and campgrounds are concentrated here.³
• Tuolumne Meadows and the High Sierra: Located along the Tioga Road (Highway 120 East, open seasonally), Tuolumne Meadows is a large, picturesque subalpine meadow complex situated at an elevation of about 8,600 feet (2,600 m).² This region represents the “High Sierra” portion of the park, characterized by granite domes (like Lembert Dome and Pothole Dome), pristine lakes (like Tenaya, Cathedral, and Elizabeth Lakes), jagged peaks (Cathedral Range, Kuna Crest), and the headwaters of the Tuolumne River.³ It offers extensive hiking and backpacking opportunities, including access to the Pacific Crest Trail and John Muir Trail.³ Services are limited and seasonal.³⁸
• Wawona and Mariposa Grove: Situated in the southern part of the park near the South Entrance (Highway 41) at an elevation around 5,130 feet (1,560 m) ⁹, Wawona is known for the historic Wawona Hotel and the Yosemite History Center.² Its main attraction is the nearby Mariposa Grove of Giant Sequoias, the largest of Yosemite’s three sequoia groves, containing over 500 mature trees, including the famous Grizzly Giant and the California Tunnel Tree.² The grove features several trails of varying difficulty.⁴⁵
• Hetch Hetchy Valley: Located in the park’s northwestern corner, Hetch Hetchy is another glacially carved valley, often compared in beauty to Yosemite Valley before it was dammed.³ The O’Shaughnessy Dam, completed in 1923, created the Hetch Hetchy Reservoir, which supplies water to San Francisco.¹⁶ Access is via the Hetch Hetchy Road (open seasonally, daytime hours only).³ It offers hiking trails, waterfalls (like Wapama and Tueeulala Falls), and a less crowded experience than Yosemite Valley.³
• Crane Flat and Tuolumne Grove: Situated west of Yosemite Valley along the Big Oak Flat Road (Highway 120 West entrance), Crane Flat (elevation ~6,200 ft) is a forested area with meadows.³ Nearby are the Tuolumne Grove and Merced Grove of Giant Sequoias, smaller than Mariposa Grove but offering quieter trails to see these magnificent trees.² Hodgdon Meadow and Crane Flat campgrounds are located in this vicinity.³
• Glacier Point: Offering arguably the most spectacular panoramic viewpoint in the park, Glacier Point (elevation ~7,214 ft) provides stunning vistas of Yosemite Valley, Half Dome, Yosemite Falls, Vernal Fall, Nevada Fall, and the High Sierra crest.³ Accessible via the Glacier Point Road (open seasonally, typically late May/June to November), it’s a popular spot for photography and stargazing.³ Several strenuous hikes begin or end here.³

C. Elevation and Topography

Yosemite National Park exhibits a dramatic range in elevation, rising from approximately 2,127 feet (648 m) near the western boundary to 13,114 feet (3,997 m) at the summit of Mount Lyell, the park’s highest peak, located on the southeastern crest.⁷ Other prominent peaks along the Sierra crest within or near the park include Mount Dana (13,057 ft) and Mount Gibbs.⁷

The topography is characterized by the asymmetric nature of the Sierra Nevada range: a long, relatively gentle western slope and a short, steep eastern escarpment.²⁰ The park lies predominantly on this western slope, which is deeply dissected by river canyons and shaped by glacial action.⁵ The landscape features include the aforementioned U-shaped valleys, hanging valleys, granite domes (Half Dome, Sentinel Dome, Lembert Dome), sheer cliffs (El Capitan), cirques, arêtes (sharp ridges), and moraines – all hallmarks of a glaciated granitic environment.⁷

D. Watersheds: The Merced and Tuolumne Rivers

Two major river systems originate within Yosemite National Park, carving deep canyons and sustaining diverse ecosystems: the Merced River and the Tuolumne River.⁷ Both are federally designated Wild and Scenic Rivers for significant portions of their length within the park, recognized for their free-flowing character and outstanding natural, cultural, and recreational values.²

• Merced River: Draining the southern portion of the park, including Yosemite Valley and Wawona, the Merced River and its South Fork have carved canyons up to 4,000 feet deep.⁷ It is fed by iconic waterfalls like Yosemite, Bridalveil, Vernal, and Nevada Falls.⁷ The river provides critical habitat and is a popular spot for rafting and swimming in summer.⁷ Restoration efforts are ongoing along the Merced River in Yosemite Valley.⁶
• Tuolumne River: Draining the entire northern portion of the park, an area of approximately 680 square miles (1,800 km²), the Tuolumne River originates along the Sierra crest near Mount Lyell and flows through Tuolumne Meadows and the Grand Canyon of the Tuolumne before reaching Hetch Hetchy Reservoir.⁷ It has also carved canyons 3,000 to 4,000 feet deep.⁹

Together, these watersheds contain thousands of lakes and ponds (over 3,200 larger than 100 sq meters), 1,700 miles (2,700 km) of streams, and extensive wetland and meadow areas, particularly in valley bottoms, that are vital components of the park’s hydrology.⁹

E. Climate Patterns

Yosemite’s climate is strongly influenced by its mountainous terrain and wide elevation range, exhibiting characteristics of a Mediterranean climate pattern with distinct seasonal variations.⁷

• Precipitation: The vast majority (95%) of precipitation occurs between October and May, primarily as snow at higher elevations.⁷ Annual precipitation averages around 36-37 inches (910-940 mm) in Yosemite Valley (4,000 ft) but increases with elevation up to about 8,000 feet.⁷ Snow typically blankets most of the park from November through May, with significant accumulation in the high country.⁸ Snowpack depth is crucial for the park’s water resources and waterfall flow.²⁷ April 1st snow surveys provide key indicators of the water content available for spring runoff.⁵⁴
• Temperature: Temperatures vary significantly with elevation and season.⁷

• Yosemite Valley (approx. 4,000 ft): Summers are warm to hot, with mean daily highs ranging from 46°F (8°C) in cooler months to 90°F (32°C) in July/August.⁷ Nights are significantly cooler.⁹ Winters are cold, with average January temperatures around 38°F (3.4°C), though daytime highs can be mild.⁷ Snowfall occurs, but rain is also common during winter storms.⁸
• Wawona (approx. 5,130 ft): Mean daily temperatures range from 36°F (2°C) to 67°F (19°C).⁹
• Tuolumne Meadows (approx. 8,600 ft): Summers are cool, with mean daily temperatures ranging from 25°F (-4°C) to 53°F (12°C).⁹ Winters are very cold and snowy, with the area inaccessible by road.⁸ Afternoon thunderstorms are common at higher elevations in summer.⁷

Climate change is demonstrably affecting these patterns, leading to rising temperatures (especially nighttime minimums), a longer growing season, reduced snowpack, earlier spring runoff, and potentially more extreme weather events.²⁶

F. Ecosystems and Life Zones

The dramatic elevation gradient, from foothill environments to alpine peaks, creates distinct ecosystems or “life zones” within Yosemite, each supporting characteristic plant and animal communities.² These zones reflect changes in temperature, precipitation, and soil conditions associated with increasing altitude. The major zones include:

1. Foothill-Woodland Zone (below ~3,000 ft): Characterized by hot, dry summers and mild, wet winters. Dominated by oak woodlands (blue oak, interior live oak), gray pine, and chaparral scrub (chamise, ceanothus, manzanita).⁴⁹ Found near El Portal and Hetch Hetchy.⁴⁹
2. Lower Montane Forest (~3,000-6,000 ft): A diverse coniferous and deciduous forest zone. Includes ponderosa pine, incense-cedar, white fir, sugar pine, Douglas-fir, and California black oak.² Yosemite Valley lies within this zone, as do the three Giant Sequoia groves (Mariposa, Merced, Tuolumne).²
3. Upper Montane Forest (~6,000-8,000 ft): Cooler and wetter than the lower montane zone, with significant winter snowpack. Dominated by red fir, lodgepole pine, Jeffrey pine, and western juniper.² Meadows within this zone feature abundant wildflowers in summer.⁴⁹ Found along Glacier Point Road and Tioga Road west of Tuolumne Meadows.⁴⁹
4. Subalpine Forest (~8,000-9,500 ft): Characterized by short growing seasons and long, cold, snowy winters. Trees include lodgepole pine, mountain hemlock, and western white pine.² Extensive subalpine meadows, like Tuolumne Meadows, bloom from July to August.²
5. Alpine Zone (above ~9,500 ft): Above the tree line, this harsh environment features rocky terrain, talus slopes, and limited vegetation adapted to cold and wind, such as dwarf willows, low-growing shrubs, and hardy wildflowers.²

This geographical diversity, shaped by geology and climate, underpins the rich biological diversity for which Yosemite is renowned.²

Human History in Yosemite

The dramatic landscape of Yosemite has been shaped not only by geological forces but also by millennia of human presence. From the earliest Indigenous inhabitants to the modern era of tourism and conservation, the human story is deeply interwoven with the natural history of the park.

A. Indigenous Peoples: The First Stewards

Human habitation in the Yosemite region dates back potentially 8,000 to 10,000 years, with continuous occupation of Yosemite Valley itself traceable to about 3,000-4,000 years ago.² The primary Indigenous groups associated with the area now encompassed by the park are the Southern Sierra Miwok and the Mono Lake Paiute.¹⁶

• The Ahwahneechee: The band residing within Yosemite Valley called themselves the Ahwahneechee, meaning “dwellers in Ahwahnee” (their name for the valley).¹⁶ They were likely a mix of Miwok and Paiute peoples.¹⁷ Archaeological evidence suggests distinct cultural phases over time, marked by changes in tools and subsistence strategies, such as the shift from using the atlatl (spear-thrower) to the bow and arrow around 500 CE.¹⁶ Their lives were intimately tied to the landscape, utilizing resources like acorns (a dietary staple), seeds, plants, deer, and fish from the western slopes, and trading for obsidian and pinyon nuts from the eastern Sierra.¹⁶ They actively managed the landscape, using fire to maintain open meadows and oak woodlands, enhancing the growth of useful plants for food and basketry.⁴⁴ Their presence is evidenced by archaeological sites, bedrock mortars used for grinding acorns, and the reconstructed Indian Village of the Ahwahnee behind the Yosemite Museum.¹³
• Impact of European Contact and the Mariposa War: The arrival of European-Americans, dramatically accelerated by the California Gold Rush starting in 1848-49, had devastating consequences for the Indigenous populations of California, including those in the Yosemite region.⁴ Competition for resources, the introduction of diseases to which Native peoples had no immunity, and outright violence led to a catastrophic population decline.¹⁷ Tensions escalated into conflict, known locally as the Mariposa War.¹⁶ In 1851, driven by accounts of raids on mining camps and trading posts (including one owned by James Savage), the state-sanctioned Mariposa Battalion entered Yosemite Valley to forcibly remove the Ahwahneechee.¹⁶ Led by Savage, the battalion pursued the Ahwahneechee under Chief Tenaya, burned their villages, destroyed food stores, and ultimately forced many onto a reservation near Fresno.¹⁶ Though some, including Tenaya, escaped or were later allowed to return, further conflicts led to Tenaya’s death and the dispersal of the remaining Ahwahneechee, many of whom joined the Mono Lake Paiute tribe.¹⁶ This violent displacement marked the end of exclusive Indigenous stewardship of Yosemite Valley. Despite this, descendants of these groups maintain strong cultural and spiritual connections to Yosemite, their ancestral homeland, and continue traditional practices within the park today.²

B. European-American Arrival and Early Tourism

While explorers like Jedediah Smith (1827) and Joseph Reddeford Walker (1833) passed near the region earlier, the Mariposa Battalion’s 1851 incursion is considered the first documented entry of European-Americans into Yosemite Valley itself.¹⁰

• “Discovery” and Popularization: Accounts from battalion members, particularly Dr. Lafayette Bunnell, vividly described the valley’s stunning beauty.¹⁶ Bunnell is credited with naming the valley “Yosemite,” mistakenly believing it was the Ahwahneechee name for “grizzly bear” (it likely derived from a Miwok term for the Ahwahneechee people, possibly meaning “they are killers”).¹⁶ These published accounts, along with subsequent visits by artists (like Thomas Ayres, Albert Bierstadt, Thomas Hill) and photographers (like Carleton Watkins, Eadweard Muybridge, Ansel Adams), spread Yosemite’s fame worldwide, attracting the first tourists.²
• Early Settlers and Access: Early tourists arrived primarily on horseback or by stagecoach over rough trails.² Entrepreneurs like James Mason Hutchings established early accommodations, and settlers like Galen Clark acted as guides.⁴ The construction of toll roads, such as the Coulterville Road (1850s) and the Wawona Road (completed 1875, largely by Chinese immigrant labor), improved access, though the journey remained arduous.¹⁶ The completion of the Yosemite Valley Railroad to El Portal in 1907 significantly eased travel and increased visitation.²

C. The Conservation Movement and Park Establishment

The growing fame of Yosemite also brought concerns about its exploitation through logging, grazing, and haphazard tourism development.⁴ This spurred a pioneering conservation movement.

• The Yosemite Grant (1864): Visionaries like photographer Carleton Watkins, landscape architect Frederick Law Olmsted, and settler Galen Clark recognized the unique value of Yosemite Valley and the nearby Mariposa Grove of Giant Sequoias.² Their advocacy, along with Senator John Conness of California, led to landmark federal legislation.¹⁶ On June 30, 1864, President Abraham Lincoln signed the Yosemite Grant Act, ceding Yosemite Valley and the Mariposa Grove to the State of California “for public use, resort, and recreation…inalienable for all time”.¹ This act, establishing the first state park and protecting land specifically for scenic beauty and public enjoyment, was a foundational moment for the future national park idea.² Galen Clark was appointed the first guardian of the Grant.¹⁶
• John Muir and National Park Status (1890): Naturalist John Muir, who arrived in 1868 and spent years exploring and writing passionately about the Sierra Nevada, became Yosemite’s most influential advocate.² He recognized that the state-managed Grant was insufficient to protect the surrounding high country watersheds from damage caused by sheep grazing and logging.¹⁶ Muir, along with Robert Underwood Johnson (editor of Century magazine) and later the Sierra Club (which Muir helped found in 1892), lobbied Congress for greater protection.¹⁶ Their efforts culminated in the Act of October 1, 1890, which created Yosemite National Park, encompassing a large area of the High Sierra surrounding, but initially excluding, the state-managed Yosemite Grant lands.²
• Unification (1906): Muir and the Sierra Club continued to advocate for federal control over the entire area.¹⁶ In 1903, Muir famously camped with President Theodore Roosevelt near Glacier Point, influencing the President’s views on conservation.⁷ In 1905, the California legislature voted to recede the Yosemite Grant lands back to the federal government, and Congress accepted the recession in 1906, finally unifying Yosemite Valley and the Mariposa Grove within Yosemite National Park.²

D. Early Park Management: Army Stewards and the NPS

From 1891 until the creation of the National Park Service, the U.S. Army cavalry troops, primarily garrisoned at the Presidio of San Francisco, served as the administrators and protectors of the new national park during the summer months.²

• Buffalo Soldiers: Notably, African American regiments, the 9th Cavalry and 24th Infantry, known as Buffalo Soldiers, served tours in Yosemite and Sequoia in 1899, 1903, and 1904.² Numbering around 500 men, they performed crucial duties despite facing racial prejudice: evicting poachers and illegal grazers, fighting fires, building trails and roads (including the first trail to the top of Mt. Whitney in Sequoia), and acting as early park rangers.² Their significant contributions were largely overlooked for decades but represent an important chapter in both military and park history.⁷⁵ Captain Charles Young, the third African American graduate of West Point, served as acting military superintendent of Sequoia and General Grant National Parks in 1903, overseeing significant infrastructure improvements.⁷⁵
• National Park Service (1916): Following the Hetch Hetchy controversy and recognizing the need for unified, professional management of the growing number of national parks, Congress passed the Organic Act in 1916, establishing the National Park Service (NPS).² The NPS took over administration of Yosemite, implementing more formalized management, interpretation (Yosemite hosted the first formal NPS interpretive programs in 1920), and visitor services.² Clare Marie Hodges became the first female NPS ranger in Yosemite in 1918.¹⁸

E. The Hetch Hetchy Controversy: A Battle for Preservation

One of the most significant and contentious events in Yosemite’s history was the battle over Hetch Hetchy Valley.¹⁶ Located within the park’s boundaries, this valley, often described as a smaller sibling to Yosemite Valley, became the target of the City of San Francisco’s quest for a reliable municipal water supply, particularly after the devastating 1906 earthquake and fire.¹⁶

Beginning around 1900, San Francisco officials sought federal permission to dam the Tuolumne River and flood Hetch Hetchy.⁵² This proposal ignited a fierce national debate, pitting preservationists, led by John Muir and the Sierra Club who believed the valley’s scenic beauty should remain untouched, against conservationists, led by figures like Gifford Pinchot (first Chief of the U.S. Forest Service), who advocated for the utilitarian management of natural resources for the “greatest good for the greatest number”.¹⁶

Muir argued passionately against the dam, calling Hetch Hetchy a “temple” and decrying the “devotees of ravaging commercialism”.⁷³ Supporters argued the reservoir was essential for San Francisco’s future and that the recreational benefits of a reservoir outweighed the loss of the valley.⁵¹ Despite years of intense lobbying, petitions, and congressional hearings, the preservationists ultimately lost.⁵¹ The Raker Act, authorizing the dam, was passed by Congress and signed into law by President Woodrow Wilson on December 19, 1913.¹⁶ John Muir died about a year later, some say heartbroken by the loss.¹⁶ Construction on the O’Shaughnessy Dam began in 1919 and was completed in 1923, inundating Hetch Hetchy Valley.¹⁶ While a major defeat for preservationists, the Hetch Hetchy battle significantly raised national awareness about wilderness preservation and is credited with helping galvanize support for the creation of the National Park Service three years later to prevent similar occurrences in other parks.¹⁶ The debate over restoring Hetch Hetchy Valley continues sporadically to this day.⁵³

F. Development and Modern Management

The 20th century saw continued development to accommodate growing tourism, alongside evolving management philosophies.

• Infrastructure and Tourism: Concessionaires like the Yosemite Park and Curry Company played a major role in developing lodging (The Ahwahnee, Yosemite Lodge, Curry Village), dining, and other visitor services.² The rise of the automobile led to road improvements but also increasing congestion.¹⁶ Activities like the Yosemite Firefall (pushing embers off Glacier Point) and bear feeding shows were popular for decades but eventually discontinued as park management shifted towards preserving natural processes and wildlife behavior.¹⁶
• Mission 66: Following decades of underfunding and neglect exacerbated by World War II (during which facilities like The Ahwahnee served as a naval hospital ⁶⁰), the NPS launched Mission 66 (1956-1966).¹⁶ This massive, decade-long, billion-dollar program aimed to modernize infrastructure across the park system in time for the NPS’s 50th anniversary.⁸¹ In Yosemite, Mission 66 resulted in major road reconstructions (including the controversial realignment of Tioga Road near Tenaya Lake), the construction of new visitor centers (like the main Yosemite Valley Visitor Center, now the Exploration Center), modernized campgrounds (Upper Pines, Lower Pines, Tuolumne Meadows, etc.), employee housing, and the development or redesign of facilities like Yosemite Valley Lodge, the Village Store complex, and Housekeeping Camp.² It introduced a distinctive modern architectural style blended with mountain aesthetics.⁸¹ While addressing critical infrastructure needs, some Mission 66 projects also generated controversy regarding their environmental impact and design.⁸¹
• Wilderness Act and Ongoing Planning: The Wilderness Act of 1964 designated 89% of Yosemite as wilderness, limiting development and emphasizing primitive recreation.¹⁵ Park management continues to evolve through comprehensive planning efforts like the General Management Plan (1980, with subsequent updates and specific plans like the Merced and Tuolumne Wild and Scenic River Management Plans, and the current Visitor Access Management Plan) aimed at balancing resource protection with visitor enjoyment in the face of increasing visitation and environmental challenges like climate change.²⁹

Yosemite’s history reflects broader themes in American history: the displacement of Indigenous peoples, the exploitation and subsequent appreciation of natural resources, the rise of the conservation movement, and the ongoing challenge of managing beloved public lands for both preservation and public enjoyment.

Paleontology: Echoes of Prehistoric Life

While Yosemite National Park is world-renowned for its dramatic granite geology and recent glacial history, its fossil record within the park boundaries is relatively sparse compared to other national parks with extensive sedimentary rock layers. The dominant igneous (granitic) and metamorphic rocks that form the Sierra Nevada batholith are generally not conducive to preserving fossils, as they formed from molten material or were significantly altered by heat and pressure.¹⁰ Furthermore, repeated, powerful glaciations scoured the landscape, removing much of the overlying, potentially fossil-bearing, younger rock and soil layers.¹⁰

Despite these limitations, understanding the paleontological context of the broader Sierra Nevada region provides insights into the prehistoric life and environments that existed before and during the dramatic geological events that shaped the park we see today.

A. Limited Fossil Evidence within Yosemite

Direct fossil discoveries within Yosemite National Park itself are rare. The park’s geology primarily tells a story of rock formation deep within the earth and subsequent sculpting by ice, rather than the deposition and preservation of organic remains in sedimentary layers.

• NPS Paleontological Inventories: The National Park Service actively inventories and manages paleontological resources across its units.¹⁰¹ These inventories involve literature reviews, museum collection searches, interviews, and field assessments to document known fossils and identify potentially fossiliferous rock formations.¹⁰³ While Yosemite is listed as one of the NPS units with documented paleontological resources ¹⁰⁴, the specific nature and significance of these resources within the park boundaries are not detailed in the provided materials and are likely very limited compared to parks like Grand Canyon, Mammoth Cave, or Dinosaur National Monument.¹⁰³ The focus of NPS paleontological efforts often lies in parks with rich sedimentary records spanning vast geological time.¹⁰¹

B. Regional Paleontological Context: Sierra Nevada and Beyond

To understand the prehistoric life relevant to the Yosemite area, one must look to the surrounding regions and the broader geological history of the Sierra Nevada.

• Ancient Plant Life (Mesozoic/Early Cenozoic): Before the major uplift of the modern Sierra Nevada, the region experienced different climates and hosted different flora. While not directly within Yosemite, fossil plant localities in the Sierra Nevada foothills and adjacent areas reveal ancient ecosystems. For example, the Eocene Ione Formation (approx. 45-48 Ma) in the foothills preserves evidence of a subtropical flora, vastly different from today’s mountain environment.¹⁰⁵ Later Miocene deposits (approx. 5-23 Ma), such as the Mehrten Formation and the Disaster Peak Formation found at high elevations today, contain fossils of plants like cypress, Douglas-fir, oaks, willow, and even giant sequoia relatives.¹⁰⁵ The presence of these plant fossils at current high altitudes (e.g., 8,600 ft for Disaster Peak) provides crucial evidence that the Sierra Nevada was much lower millions of years ago (perhaps only 2,500 ft at that location 7 Ma) before the significant Pliocene-Pleistocene uplift.¹⁰⁵ Petrified wood is also found in these regional Tertiary formations.¹⁰⁵
• Pleistocene Megafauna (Ice Age Animals): During the Pleistocene Epoch (roughly 2.6 million to 11,700 years ago), the era of Yosemite’s major glaciations, California hosted a remarkable array of large mammals known as megafauna.¹⁰⁷ While direct evidence within Yosemite’s glaciated core is scarce, fossil sites in surrounding areas and similar environments paint a picture of the life that existed in the broader region during warmer interglacial periods or in unglaciated refugia.

• Fossil Discovery Center (Madera County): Located south of Yosemite near Chowchilla, this center showcases Middle Pleistocene fossils (approx. 780,000 years old) found locally.⁴³ Discoveries include Columbian mammoths, saber-toothed cats (Smilodon californicus – the California State Fossil), giant ground sloths, dire wolves, camels, horses, and short-faced bears.⁴³ These animals roamed the grasslands and woodlands of the Central Valley and foothills adjacent to the emerging Sierra Nevada.
• Nevada Fossil Sites: East of the Sierra Nevada, areas like Tule Springs Fossil Beds National Monument and Ice Age Fossils State Park in Nevada preserve rich Pleistocene records.¹⁰⁷ These sites reveal ecosystems that included mammoths, mastodons, American lions, camels, dire wolves, horses, and giant ground sloths, often associated with ancient wetlands and springs that existed even in today’s desert environments.¹⁰⁷ Fossil footprints from this era have also been found in Nevada.¹⁰⁸
• La Brea Tar Pits (Los Angeles): Although geographically distant, the world-famous La Brea Tar Pits provide an unparalleled window into Late Pleistocene life in California (approx. 10,000-40,000 years ago).¹⁰⁹ Fossils recovered there include mammoths, mastodons, saber-toothed cats, dire wolves, American lions, ground sloths, horses, camels, bison, and numerous bird species.¹⁰⁹ Many of these species likely inhabited suitable habitats throughout California, including the lower elevations and foothills bordering Yosemite, during periods when climate allowed.
• Post-Glacial Environments: As glaciers retreated at the end of the Pleistocene, the landscape within Yosemite began to resemble what we see today. Vegetation recolonized the scoured terrain, and modern fauna moved into the newly available habitats.¹⁶ The species composition continued to shift in response to ongoing climate fluctuations leading up to the present day.

C. Significance and Interpretation

While Yosemite itself may not be a primary site for fossil discoveries, the paleontological context of the Sierra Nevada region is crucial for understanding the park’s deep history. Fossil evidence from surrounding areas helps reconstruct the ancient environments, climates, and ecosystems that existed before and during the mountain range’s uplift and glaciation. It highlights the immense environmental changes the region has undergone and provides a baseline against which modern ecological changes, including those driven by climate change, can be assessed. Visitors can connect with this deeper past through exhibits at the Yosemite Museum, which interprets the long history of human interaction with the landscape, and by visiting nearby sites like the Fossil Discovery Center of Madera County.³⁷ The ongoing work of the NPS Paleontology Program ensures that any fossil resources found within Yosemite are documented and protected according to federal law and scientific best practices.¹⁰¹

Flora and Fauna

Yosemite National Park’s dramatic elevation range, varied topography, and distinct microclimates create a mosaic of habitats that support a remarkable diversity of plant and animal life.² From sun-baked foothills to windswept alpine peaks, the park protects a significant cross-section of Sierra Nevada ecosystems, making it a crucial sanctuary for biodiversity.² Over 1,200 species of flowering plants and more than 400 species of vertebrates (mammals, birds, reptiles, amphibians, fish) call Yosemite home.¹³

A. Plant Communities and Vegetation Zones

Yosemite’s plant life is largely organized into distinct vegetation zones determined primarily by elevation, which influences temperature, precipitation, and growing season length.⁶ Traveling from the park’s western boundary to the High Sierra crest is akin to traveling hundreds of miles north in latitude.⁶⁷

1. Foothill-Woodland Zone (Below ~3,000 ft): Found at the lowest, hottest, and driest elevations, primarily along the western edge near El Portal and Hetch Hetchy.⁴⁹ This zone features drought-tolerant species adapted to long, hot summers and mild winters with little snow.⁴⁹ Characteristic plants include:

• Trees: Blue Oak (Quercus douglasii), Interior Live Oak (Quercus wislizeni), Gray Pine (Pinus sabiniana).⁴⁹
• Shrubs: Chaparral species like Chamise (Adenostoma fasciculatum), various species of Ceanothus (California Lilac), and Manzanita (Arctostaphylos spp.).⁴⁹

2. Lower Montane Forest (~3,000-6,000 ft): This extensive zone covers areas like Yosemite Valley, Wawona, Hetch Hetchy, and the slopes along the Big Oak Flat and Wawona Roads.⁴⁹ It experiences hot, dry summers and cool, moist winters with significant snowfall.⁴⁹ This zone boasts a rich mix of conifers and deciduous trees.²

• Trees: Ponderosa Pine (Pinus ponderosa), Incense-Cedar (Calocedrus decurrens), White Fir (Abies concolor), Sugar Pine (Pinus lambertiana), Douglas-fir (Pseudotsuga menziesii), California Black Oak (Quercus kelloggii).² Black oaks are particularly important culturally and ecologically, providing acorns as a key food source.⁶¹
• Giant Sequoias (Sequoiadendron giganteum): Yosemite’s three groves of these magnificent, massive trees – the Mariposa Grove (largest, near South Entrance), Tuolumne Grove, and Merced Grove (both smaller, near Crane Flat) – are located within this zone.² These trees are among the largest and oldest living things on Earth.⁶
• Understory: Whiteleaf Manzanita (Arctostaphylos viscida) is common.⁴⁹ Meadows and open areas support wildflowers in spring and summer.⁷

3. Upper Montane Forest (~6,000-8,000 ft): Found at higher elevations like Crane Flat, parts of Glacier Point Road, and areas surrounding Yosemite Valley.⁴⁹ This zone experiences shorter, cooler summers and long, cold, snowy winters.⁴⁹

• Trees: Dominated by dense stands of Red Fir (Abies magnifica) and Lodgepole Pine (Pinus contorta).²² Jeffrey Pine (Pinus jeffreyi, noted for its vanilla-scented bark) and picturesque Western Juniper (Juniperus occidentalis) are also present.²
• Wildflowers: Meadows in this zone bloom beautifully from June through August.⁴⁹

4. Subalpine Forest (~8,000-9,500 ft): Encompassing areas like Tuolumne Meadows and extending towards Tioga Pass.⁴⁹ Climate is characterized by very short growing seasons and long, cold winters with deep snowpack.⁴⁹

• Trees: Lodgepole Pine, Mountain Hemlock (Tsuga mertensiana), and Western White Pine (Pinus monticola) are dominant.² Whitebark Pine (Pinus albicaulis), a critical high-elevation species facing threats, is also found here.⁴⁹
• Meadows: Extensive subalpine meadows flower from July through August.²

5. Alpine Zone (Above ~9,500 ft): This is the treeless zone above the timberline, characterized by harsh conditions, rocky outcrops, talus slopes, and a very short growing season.² Vegetation is sparse, consisting of low-growing, hardy herbaceous plants, dwarf shrubs (like dwarf willow), grasses, sedges, and lichens that must reproduce quickly during the brief summer.⁷

In addition to these elevation zones, specialized habitats like meadows, riparian areas (along rivers and streams), and chaparral contribute to the park’s botanical richness.² Yosemite is a popular destination for viewing wildflowers, particularly in spring at lower elevations and progressing to higher elevations through summer.⁴⁹ Fall colors, especially from black oaks, maples, and dogwoods, provide autumn beauty, mainly in Yosemite Valley and Wawona.⁴⁹

B. Wildlife Diversity

Yosemite’s diverse habitats support a corresponding diversity of animal life, including approximately 90 mammal species, over 260 bird species, 22 reptile species, 11 native amphibian species, and native and non-native fish.²

• Mammals:

• American Black Bear (Ursus americanus): Perhaps the most iconic mammal, Yosemite is home to an estimated 300-500 black bears.¹¹¹ Despite their name, their fur is often brown.¹¹¹ They are highly intelligent and adaptable, but their attraction to human food necessitates strict food storage regulations and intensive management efforts to prevent conflicts (See Section VI.C. Bear Management).³
• Mule Deer (Odocoileus hemionus): Commonly seen, especially in Yosemite Valley and meadows, browsing on shrubs and grasses.⁴ While often accustomed to humans, feeding them is prohibited and dangerous, as more injuries are reported from deer than bears.⁶¹
• Sierra Nevada Bighorn Sheep (Ovis canadensis sierrae): A federally listed endangered subspecies.¹¹¹ Once extirpated from the park (gone by 1914), they were reintroduced starting in 1986 and now inhabit the high alpine zones, particularly the Cathedral Range.¹³ Recovery efforts are ongoing, supported by CDFW, NPS, and partners like Yosemite Conservancy, focusing on monitoring, habitat, predation, and disease risks.³¹ Population numbers fluctuate, impacted by factors like severe winters and predation, dropping from over 600 in 2015 to below 300 in early 2023.¹²⁴
• Coyotes (Canis latrans): Fairly common but typically shy; often heard howling.¹¹¹
• Rodents: This is the most diverse mammal group, including various species of squirrels (Western Gray Squirrel, Douglas Squirrel, California Ground Squirrel, Golden-mantled Ground Squirrel), chipmunks, marmots, mice, and gophers.¹³
• Bats: Seventeen species of bats inhabit Yosemite, playing important roles in insect control.⁶¹ Research monitors potential threats like White-Nose Syndrome.¹¹²
• Other Carnivores: Less commonly seen predators include mountain lions (Puma concolor), bobcats (Lynx rufus), and the rare Sierra Nevada red fox (Vulpes vulpes necator) and Pacific fisher (Pekania pennanti).⁶² Research projects focus on these elusive species.⁶²
• Birds: Yosemite is a designated Global Important Bird Area, with over 165 resident or breeding species and nearly 100 more transient species recorded.¹¹⁶ Bird diversity varies by habitat and elevation.⁶⁷

• Common Residents/Sightings: Steller’s Jay, American Robin, Acorn Woodpecker, Common Raven, Mountain Chickadee, Dark-eyed Junco, White-headed Woodpecker, Red-breasted Nuthatch, Brown Creeper, Western Tanager (summer), Black-headed Grosbeak (summer), various warblers, vireos, and flycatchers.¹¹⁶
• Habitat Specialists: American Dippers along streams, Sooty Grouse in forests, Clark’s Nutcrackers and Rosy Finches in the high country.⁶⁷
• Birds of Prey: Peregrine Falcon, Golden Eagle, Bald Eagle (rare), Red-tailed Hawk, Osprey, Great Horned Owl, Spotted Owl, Great Gray Owl (rare).¹³ Nesting sites, particularly for peregrine falcons, are monitored and sometimes protected with seasonal closures.¹¹²
• Acorn Woodpecker (Melanerpes formicivorus): Conspicuous in oak woodlands (Lower Montane zone), known for its clown-like face, loud calls, and communal behavior.¹¹⁴ They create “granary trees” by drilling thousands of holes to store acorns, their critical winter food source.¹¹⁴ They live in family groups, cooperatively raising young and defending their acorn caches.¹¹⁴
• Steller’s Jay (Cyanocitta stelleri): A large, bold, crested jay common in coniferous and mixed forests throughout the park, often seen near campgrounds and picnic areas.⁶⁷ Recognizable by its black head/crest and deep blue body.¹³³ Known for its intelligence, mimicry, harsh calls, and habit of caching food (like acorns and nuts) and sometimes robbing nests.¹³³

• Reptiles and Amphibians: Yosemite hosts 22 reptile species (lizards, snakes, one turtle) and 11 native amphibian species (frogs, toads, salamanders).¹³ Several amphibians, like the Sierra Nevada yellow-legged frog and Yosemite toad, are species of concern, facing threats from habitat changes, disease (like chytrid fungus), and introduced predators.²⁷ Restoration projects target aquatic habitats.⁶⁰ The California red-legged frog and foothill yellow-legged frog are believed extirpated from the park.⁶¹
• Fish: Native fish, adapted to the Sierra Nevada’s cold waters, are primarily found only in lower elevation streams and rivers below major natural waterfalls, which acted as barriers to upstream movement.⁶¹ Rainbow trout are among the native species. However, widespread stocking of non-native fish, mainly various species of trout (brook, brown, golden), occurred historically throughout the park, including high-elevation lakes and streams that were naturally fishless.⁶¹ This introduction has had significant impacts on native aquatic ecosystems, particularly on amphibians like the Sierra Nevada yellow-legged frog, whose tadpoles are preyed upon by introduced trout. Current park management focuses on understanding these impacts and, in some cases, restoring native conditions. Fishing is permitted but subject to specific regulations.³
• Insects and Invertebrates: A vast array of insects, spiders, and other invertebrates play crucial roles in pollination, decomposition, and the food web.⁶¹ Forest pests, such as bark beetles, can cause significant tree mortality, particularly during drought periods exacerbated by climate change.⁶⁰ Invasive species like the New Zealand mudsnail pose threats to aquatic ecosystems.⁶⁵

C. Conservation Efforts and Challenges

Protecting Yosemite’s rich biodiversity faces numerous challenges, many stemming from human influences both inside and outside the park.

• Habitat Restoration: Projects focus on restoring degraded habitats, such as meadows (e.g., Ackerson Meadow, Lyell Canyon, Tuolumne Meadows), forests (through fire management), and riparian areas (along the Merced River).⁶ These efforts aim to improve ecosystem health, water quality, carbon storage, and resilience.⁶³ Yosemite Conservancy is a key partner in funding many restoration projects.³¹
• Wildlife Management: Specific programs target key species:

• Bear Management: Focuses on reducing human-bear conflicts through education, strict food storage enforcement, bear-proof infrastructure (lockers, dumpsters), and monitoring (See Section VI.C).⁸²
• Bighorn Sheep Recovery: Ongoing efforts to monitor populations, manage predation, and maintain genetic diversity for this endangered species.³¹
• Rare Carnivore Research: Studying elusive species like fishers and Sierra Nevada red foxes to understand habitat needs and threats.⁶²
• Aquatic Wildlife Restoration: Efforts to restore populations of native amphibians and remove non-native fish where appropriate.⁶⁰
• Bird Monitoring: Long-term programs like MAPS track songbird populations to assess trends and impacts of environmental change.³¹

• Invasive Species Management: A dedicated program works to prevent, detect, and control invasive plants (like yellow star-thistle, Himalayan blackberry, bull thistle) and animals (like New Zealand mudsnail, potentially Didymo algae) that threaten native ecosystems.¹¹ Integrated Pest Management (IPM) strategies are employed, including prevention (equipment washing, weed-free forage), early detection surveys, prioritization, manual/mechanical removal, and targeted herbicide use.³¹
• Climate Change: This poses a pervasive threat, altering temperature and precipitation patterns, shrinking snowpack and glaciers, increasing wildfire frequency and severity, stressing forests (leading to tree die-offs from drought and pests), causing shifts in species ranges (often upslope), and potentially leading to novel ecosystem compositions.¹⁴ Adaptation strategies are being developed and implemented (See Section VI.D).
• Extirpated Species: Grizzly bears (once common, now absent), California red-legged frogs, and foothill yellow-legged frogs are believed to have been lost from the park in recent history.¹³ Wolves are also no longer present.¹³ These losses highlight the vulnerability of species to past and present pressures.

Yosemite’s flora and fauna represent a precious natural heritage. Ongoing research, monitoring, restoration, and adaptive management are essential to conserve this living tapestry in the face of numerous challenges, ensuring its persistence for the future.

Park Management

Managing a complex and beloved place like Yosemite National Park involves balancing the core mission of preserving natural and cultural resources unimpaired for future generations with providing for public enjoyment, education, and inspiration.² This stewardship is guided by foundational legislation like the NPS Organic Act of 1916 and park-specific plans, and addresses a range of pressing issues including resource protection, visitor use, and environmental change.²

A. Guiding Principles and Plans

Yosemite’s management is rooted in a hierarchy of laws, policies, and plans:

• NPS Organic Act (1916): Provides the fundamental mandate to conserve scenery, natural and historic objects, and wildlife, leaving them unimpaired for future generations.²
• Yosemite National Park Enabling Legislation (1890, etc.): Specific acts establishing and modifying the park provide congressional direction.¹¹
• Yosemite General Management Plan (GMP) (1980, with subsequent amendments/updates): This foundational document sets the long-term vision and broad goals for the park.³⁵ Key goals from the 1980 GMP included reclaiming natural beauty by reducing development in sensitive areas like Yosemite Valley, limiting and eventually removing private vehicles from the Valley, promoting public transit, restoring natural processes (like fire), and relocating non-essential facilities outside the park.³⁵ While some goals (like complete vehicle removal) have not been fully realized, the GMP established a framework for subsequent planning.
• Foundation Document (2016): Reaffirms the park’s purpose, significance, fundamental resources and values, and key interpretive themes, providing a basis for future planning and management decisions.² It identifies high-priority planning needs, such as a comprehensive visitor use management strategy and housing solutions.⁹⁹
• Specific Management Plans: Numerous detailed plans address specific resources or issues, often stemming from the GMP. Examples include:

• Merced and Tuolumne Wild and Scenic River Management Plans.²⁹
• Fire Management Plan (2004, amended 2017).⁶³
• Scenic Vista Management Plan (2011).⁴⁴
• Resource Stewardship Strategy (RSS): While a formal, comprehensive RSS for Yosemite may not be finalized or publicly available ³⁴, the concept of an RSS – a long-range strategy to achieve desired resource conditions based on science and monitoring – guides resource management efforts.⁹⁶ The Foundation Document serves a similar guiding role.⁹⁶
• Visitor Access Management Plan (VAMP) (In progress).²⁹
• Wilderness Stewardship Plan (In progress).³⁴
• Climate Action Plan (2006).¹³⁸

Management involves ongoing monitoring (e.g., NPS Inventory & Monitoring vital signs), research, environmental assessments (NEPA process), public involvement, and collaboration with partners like Yosemite Conservancy, gateway communities, other agencies, and traditionally associated Tribes.¹¹

B. Resource Protection Strategies

Protecting Yosemite’s natural and cultural heritage is paramount. Key strategies include:

• Fire Management: Recognizing that fire is a natural and essential process in Sierra Nevada ecosystems, Yosemite has shifted from a policy of total fire suppression (dominant for much of the 20th century) to a more integrated approach.¹³ Decades of suppression led to overly dense forests, accumulation of hazardous fuels, and encroachment of conifers into meadows and oak woodlands, increasing the risk of unnaturally severe wildfires.¹³ The current Fire Management Plan (2004, amended 2017) aims to restore fire’s natural role while protecting human life, property, and sensitive cultural resources.⁶³ Tools include:

• Wildfire Management: Allowing lightning-ignited fires to burn under specific conditions (monitoring weather, fuel loads, air quality, potential threats) primarily in wilderness areas to achieve ecological benefits.⁶³ Fires threatening life/property or human-caused fires are suppressed.⁶³
• Prescribed Fire (Broadcast Burning): Intentionally setting fires under carefully controlled conditions (prescription window for weather, humidity, wind, etc.) to mimic natural or traditional Indigenous burning practices, reduce fuel loads, thin forests, restore meadows/oak woodlands, and enhance habitat.⁴⁴
• Mechanical Thinning and Pile Burning: Using chainsaws or other equipment to remove smaller trees and brush, especially near communities (Wildland-Urban Interface – WUI), sequoia groves, and along evacuation routes, to create defensible space and safer conditions for firefighters.⁶³ Removed material is often piled and burned later under safe conditions (pile burning).⁵⁴
• Monitoring: Fire effects monitoring tracks the impact of fire and thinning on vegetation, fuels, wildlife, and cultural resources to inform future management.⁴⁴

• Invasive Species Control: Invasive non-native plants and animals pose a significant threat to Yosemite’s biodiversity and ecosystem function.¹¹ The Invasive Plant Management program uses an Integrated Pest Management (IPM) approach focusing on prevention (e.g., inspecting equipment and construction materials, requiring weed-free forage for stock), early detection and rapid response (inventorying and mapping infestations), prioritization based on threat level, and control methods (manual removal, targeted herbicide use).³¹ Key target species include Himalayan blackberry, yellow star-thistle, bull thistle, and New Zealand mudsnail.¹¹ Public awareness and cooperation (e.g., cleaning boots/gear) are crucial for prevention.¹³⁶
• Bear Management: Yosemite’s comprehensive bear management program aims to keep bears wild and reduce human-bear conflicts, which historically led to property damage and the killing of bears that became habituated to human food.⁸² Key elements include:

• Food Storage: Strict regulations require all food and scented items to be stored in park-provided, bear-resistant food lockers (in campgrounds, picnic areas, parking lots, some trailheads) or approved portable bear-resistant canisters (required for backpacking).³ Hanging food is illegal.¹⁵¹ Enforcement includes warnings, citations, and potential food impoundment.¹¹⁷
• Infrastructure: Installation of thousands of food lockers and bear-resistant trash/recycling receptacles throughout the park.³
• Education: Intensive public information campaigns through signage, brochures, ranger programs, and website information to educate visitors on proper food storage and bear safety.³
• Monitoring and Response: Tracking bear activity and incidents (damage, obtaining food) through reporting hotlines, ranger patrols, and GPS collaring of some bears.⁵⁴ Hazing techniques (noise, projectiles) are used to discourage bears from developed areas.¹²¹ Relocation or, as a last resort, euthanasia may be employed for bears that pose a persistent threat to human safety.⁸²
• Success: These integrated efforts have led to a significant decrease in human-bear incidents and property damage compared to peak levels in the late 1990s, although vigilance remains crucial as human error is still the primary cause of conflicts.¹¹⁸

• Habitat and Ecosystem Restoration: Beyond fire management, projects actively restore meadows, wetlands, riparian zones, and forests impacted by past development or altered natural processes.⁶ Examples include the large-scale Ackerson Meadow restoration, Merced River restoration work, and removal of invasive plants or unnecessary infrastructure.⁶⁴
• Cultural Resource Protection: Management actions consider impacts on cultural resources, including archaeological sites, historic structures (like National Historic Landmarks The Ahwahnee, Wawona Hotel, LeConte Memorial Lodge, Rangers’ Club, Parsons Memorial Lodge), and cultural landscapes.² Fire management plans include strategies to reduce fire risk to these resources.⁸⁷ Consultation with traditionally associated Tribes is integral to managing culturally significant sites and practices, such as the ongoing planning for traditional plant gathering.²

C. Visitor Use Management

Managing the impacts of millions of annual visitors, particularly concentrated in Yosemite Valley and during peak season (roughly April-October), is a major ongoing challenge.¹¹ Overcrowding leads to traffic congestion, parking shortages, delays, strain on facilities and staff, impacts on natural and cultural resources (e.g., trail erosion, vegetation trampling, wildlife disturbance), and diminished visitor experience quality.²

• Visitor Access Management Plan (VAMP): Recognizing these issues, the park is currently developing a comprehensive VAMP through an Environmental Assessment (EA) process.³⁰ The goal is to find long-term strategies to manage day-use visitor access sustainably, protecting resources while providing equitable access and high-quality experiences.³⁰
• Reservation Systems: The VAMP EA evaluates several alternatives, including variations of vehicle reservation systems during peak hours/seasons, building on lessons learned from pilot systems implemented in 2020-2022 and 2024.⁸ The park’s preferred alternative (Alternative B in the Draft EA) involves a parkwide reservation requirement during peak hours (e.g., 5 am – 4 pm) from April through October, with reservations valid for three days.³³ Other alternatives explored include timed-entry reservations (one-day validity, specific arrival window) and reservations required only for Yosemite Valley access.³³ The final decision on the VAMP and future reservation requirements is pending completion of the planning process (expected late 2024/early 2025).³⁰
• Transportation Management: Encouraging use of public transit (YARTS) and in-park shuttles is a key strategy to reduce vehicle congestion.⁸ Infrastructure improvements like expanding electric vehicle charging for transit buses are planned.⁸⁶ The VAMP also considers enhancing bicycle/pedestrian options and improving entrance station efficiency.⁷¹
• Capacity Limits and Monitoring: River management plans establish user capacities for certain areas.⁹⁹ Monitoring programs track visitor use levels, resource impacts (e.g., trail conditions, campsite impacts), and visitor experience indicators to inform management actions.¹¹ Projects like the Mist Trail Corridor Plan aim to address safety and sustainability on heavily used trails.²⁹

D. Climate Change and Air Quality

Yosemite faces significant environmental challenges originating largely outside its boundaries.

• Climate Change: Global climate change is causing observable impacts in Yosemite, including rising temperatures (warming 1.6°F/century since 1895, accelerating to 3.4°F/century 1950-2010), especially nighttime minimums (+7.6°F 1915-2012 in Valley), and a longer growing season (+88 frost-free days 1907-2012 in Valley).²⁶ Projected future impacts (by 2100) include further significant warming (potentially 6.7–10.3°F), more extreme heat days, potentially more extreme storms, drastically reduced snowpack (especially at mid-elevations), earlier snowmelt and waterfall runoff, shrinking glaciers (likely disappearance within decades), increased wildfire frequency and severity (potentially tripling), widespread tree mortality due to drought stress and insect outbreaks, shifts in species ranges (upslope migration), and altered ecosystem compositions.²⁶
• Adaptation Strategies: Recognizing that preventing all impacts is impossible, NPS is focusing on climate change adaptation – adjusting management practices to reduce vulnerability and enhance resilience.²⁶ This involves:

• Understanding Vulnerability: Assessing which resources (species, habitats, cultural sites, facilities) are most vulnerable to climate change impacts through monitoring and research.²⁶
• Scenario Planning: Using climate projections to anticipate future conditions and plan for multiple possibilities.⁹⁸
• Resist-Accept-Direct (RAD) Framework: A decision-making framework guiding managers to strategically choose whether to resist change (maintain current conditions), accept change (allow transitions without intervention), or direct change towards a desired new state better adapted to future conditions.¹⁴⁰
• Specific Actions: Implementing projects focused on ecosystem resilience (e.g., restoring meadows and forests to better handle drought/fire), potentially assisting species migration (managed relocation), protecting critical water sources, and adapting infrastructure.⁶⁴

• Mitigation: Reducing the park’s own carbon footprint through sustainable operations, including expanding hybrid/electric shuttle fleets, promoting public transit, increasing energy efficiency in buildings (using alternative energy like solar, efficient lighting), improving waste management (recycling, composting), and green procurement.¹⁰⁰ The 2006 Climate Action Plan set initial reduction goals.¹³⁸
• Education: Communicating climate change science, impacts, and solutions to park staff, visitors, and the public is a key component of the response strategy.²⁶
• Air Quality: Air pollution, primarily ozone and particulate matter (haze/smoke), originating from the Central Valley and other sources, significantly impacts Yosemite’s air quality, visibility, ecosystems, and human health.¹¹ Ozone levels often exceed health standards, potentially injuring sensitive vegetation like ponderosa and Jeffrey pines.¹⁴ Haze obscures iconic views.¹⁴ Wildfire smoke (from both park fires and regional fires) contributes significantly to particulate matter levels, especially during fire season.⁴⁴ The park monitors air quality and provides forecasts and health advisories.⁶⁰ Fire management practices include smoke management considerations to minimize impacts on communities and visitors when possible.⁴⁴

The management of Yosemite National Park is a dynamic and complex undertaking, requiring constant adaptation, scientific understanding, and public engagement to protect its invaluable resources and ensure its enjoyment for current and future generations in an era of significant environmental and social change.

Planning Your Yosemite Adventure

Visiting Yosemite National Park is an unforgettable experience, but its popularity and vastness require careful planning, especially during peak season (roughly April through October). Understanding transportation, lodging, reservations, fees, activities, and regulations is crucial for a smooth and enjoyable trip.⁸

A. Getting There and Getting Around

• Driving: Yosemite is accessible by car year-round via Highways 41 (from the south, near Fresno/Oakhurst), 140 (from the west, Merced/Mariposa – often considered the ‘all-weather’ route as it stays at lower elevations longer), and 120 (from the west, near Manteca/Groveland).⁸ Highway 120 East (Tioga Pass) provides access from the east side of the Sierra (Lee Vining, Mammoth Lakes) but is closed due to snow typically from November through late May or June.³ Glacier Point Road is also closed seasonally for winter.³ Always check current road conditions (call 209-372-0200, press 1, 1) before your trip, especially outside of summer.³⁷ GPS directions can be unreliable in and around the park; use park maps.³ Tire chains may be required during fall, winter, and spring.³ Be prepared for significant traffic congestion and limited parking, especially in Yosemite Valley during peak season; arrive early (before 9 am) or late (after 5 pm) to avoid the worst delays.⁶⁰
• Airports: Major airports within a few hours’ drive include Fresno Yosemite International (FAT), Sacramento International (SMF), Oakland International (OAK), San Francisco International (SFO), and Reno-Tahoe International (RNO – seasonal access via Tioga Pass).³
• Public Transportation (YARTS): The Yosemite Area Regional Transportation System (YARTS) provides bus service into Yosemite Valley and other park locations from gateway communities along Highways 140, 41, 120 West, and 120 East (seasonal).⁸ Riding YARTS bypasses the need for a peak-hours vehicle reservation and avoids parking hassles.⁸ Amtrak connects to YARTS service in Merced.³⁶
• In-Park Shuttles: Free shuttle buses operate within Yosemite Valley year-round, providing access to trailheads, lodging, visitor centers, and viewpoints.³⁹ A free shuttle also serves the Mariposa Grove (seasonal).⁴⁵ Using the shuttles is highly recommended once parked in Yosemite Valley.¹⁵⁵ Limited shuttle service runs to Tuolumne Meadows and a fee-based hikers’ bus serves high country trailheads when Tioga Road is open.¹⁵⁵
• Biking: Bicycles are a great way to get around Yosemite Valley’s flat floor, with over 12 miles of paved paths.³ Bikes are generally restricted to paved paths and roads. Rentals are available in Yosemite Valley.³
• RV and Trailer Restrictions: Size restrictions apply on some park roads (e.g., Hetch Hetchy Road, Mariposa Grove Road, Glacier Point Road beyond Badger Pass). Check restrictions before arriving.³

B. Reservations and Permits (2025 Information)

Due to high demand, reservations are crucial for visiting Yosemite, especially during peak season.

• Peak-Hours Entry Reservation: A reservation is required to drive a vehicle into or through Yosemite National Park between 6 am and 2 pm on specific dates in 2025:

• May 24–26 (Memorial Day Weekend)
• June 15–August 15 (Daily)
• August 30–September 1 (Labor Day Weekend)
• Reservations cost $2 (non-refundable) and are available in addition to the park entrance fee.⁸
• Reservations are obtained via Recreation.gov.¹⁴⁹ The majority are released on May 6, 2025, at 8 am PDT for all arrival dates. Additional reservations become available seven days before the arrival date at 8 am PDT.¹⁵³ These sell out almost immediately.¹⁵³
• A peak-hours reservation is valid for entry for three consecutive days.¹⁵³
• Exemptions: You DO NOT need a peak-hours vehicle reservation if you have proof of an in-park reservation for lodging, camping (in park only, not outside), a wilderness permit, or a Half Dome permit; or if you enter via YARTS, on bicycle, foot, or horseback; or if you are only visiting the Hetch Hetchy area.¹⁵³ You also don’t need one if you arrive outside the peak hours (before 6 am or after 2 pm).¹⁵³

• Accommodation Reservations: Lodging and campground reservations are highly recommended year-round and essential during peak season. They often book up months in advance.³
• Wilderness Permits: Required for all overnight backpacking trips. Demand is high; apply via lottery or reservation well in advance. Some first-come, first-served permits may be available.³
• Half Dome Permits: Required to ascend the Half Dome cables. Obtained via competitive preseason (March) and daily (2 days prior) lotteries on Recreation.gov.³
• Climbing Permits: A free Wilderness Climbing Permit is required for overnight big wall climbs.³

C. Accommodation: Lodging and Camping

Yosemite offers a range of accommodation options both inside and outside the park.

• Camping (In-Park): Thirteen campgrounds are located within Yosemite, offering sites for tents, RVs, and groups.³

• Reservations: Required year-round for Upper Pines and from April/May through October for all other campgrounds.³ Reservations open up to 5 months in advance on Recreation.gov and are extremely competitive, often selling out within minutes.³ Some campgrounds (e.g., Tuolumne Meadows, seasonal campgrounds) use shorter booking windows (2 weeks or 2 months).⁵⁶ Camp 4 uses a daily lottery one week in advance.³
• First-Come, First-Served (FCFS): Only available during the winter season (approx. Nov-Mar/Apr) at Camp 4, Wawona, and Hodgdon Meadow; these can still fill, especially on weekends/holidays.³
• Amenities: Most campgrounds have potable water and flush toilets seasonally; some are more primitive with vault toilets and seasonal creek water (treatment required). Food lockers are provided at every site and are mandatory for food storage.³ RV hookups are not available. Dump stations are located in Yosemite Valley (year-round) and seasonally at Wawona and Tuolumne Meadows.
• Table: Yosemite Campground Overview

Data compiled from.³ Seasons and amenities are approximate and subject to change.

• Lodging (In-Park): Options range from rustic tent cabins to the luxurious Ahwahnee Hotel, all operated by Yosemite Hospitality (Aramark).³ Reservations open 366 days in advance and are essential, especially for summer and holidays.¹⁵⁹
• Table: In-Park Lodging Overview

Data compiled from.² Price Range is relative: $ = Budget, =Moderate,$ = Upper-Mid, $$$$ = Luxury. Seasonality and availability subject to change.

• Nearby Accommodation: Numerous options exist in gateway towns outside the park entrances, including hotels, motels, lodges, B&Bs, and vacation rentals.²⁹ Private rentals are also available inside park boundaries in Wawona, Yosemite West, and Foresta.¹⁵³ Popular gateway towns include Fish Camp and Oakhurst (Hwy 41 South), El Portal, Midpines, and Mariposa (Hwy 140 West), Buck Meadows and Groveland (Hwy 120 West), and Lee Vining, June Lake, and Mammoth Lakes (Hwy 120 East – seasonal access).²⁹ Notable lodges outside include Tenaya at Yosemite (Fish Camp), Yosemite View Lodge (El Portal), Rush Creek Lodge and Evergreen Lodge (Groveland).⁴³

D. Park Essentials: Fees, Permits, and Regulations

• Fees & Passes (2025):

• Entrance Fee: $35/vehicle, $30/motorcycle, $20/individual (valid 3 days).⁸ Credit cards/mobile pay only at entrances (no cash).¹⁴⁹
• Passes: Yosemite Annual Pass ($70); America the Beautiful Passes (Annual $80, Senior $20/$80, Military Free, Access Free, 4th Grade Free) cover entrance fees.⁸
• Reservation Fee: $2 for peak-hours entry reservation (separate from entrance fee).⁸

• Permits: Specific permits are required for wilderness backpacking, climbing Half Dome cables, and overnight big wall climbing (see details above and in relevant activity sections).³ Special Use Permits are needed for activities like weddings or commercial filming.³
• Key Regulations:

• Food Storage: Extremely important due to bears. Use required food lockers or allowed bear canisters for all scented items (food, drinks, toiletries, trash, coolers). Never leave food unattended, in tents, or in cars overnight. Strict enforcement with potential fines ($5,000) and confiscation.³
• Pets: Allowed only in developed areas, paved paths/roads

Reference

1. Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/
2. www.nps.gov, accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/upload/yose_foundationdocument.pdf
3. Yosemite – National Park Service, accessed May 2, 2025, https://home.nps.gov/yose/index.htm
4. Park History | Yosemite National Park CA | TravelYosemite.com, accessed May 2, 2025, https://www.travelyosemite.com/plan/park-history/
5. www.nps.gov, accessed May 2, 2025, https://www.nps.gov/articles/nps-geodiversity-atlas-yosemite-national-park.htm#:~:text=Several%20of%20the%20largest%20exposed,range%20in%20east%2Dcentral%20California.
6. Brochures – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/brochures.htm
7. Yosemite National Park | Location, History, Climate, & Facts …, accessed May 2, 2025, https://www.britannica.com/place/Yosemite-National-Park
8. Basic Information – Yosemite National Park (U.S. National Park …, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/basicinfo.htm
9. Yosemite National Park – Wikipedia, accessed May 2, 2025, https://en.wikipedia.org/wiki/Geography_of_the_Yosemite_area
10. 10.5: Case Study – Yosemite National Park – Geosciences LibreTexts, accessed May 2, 2025, https://geo.libretexts.org/Bookshelves/Geography_(Physical)/California_Geography_(Patrich)/10%3A_The_Sierra_Nevada/10.05%3A_CASE_STUDY__YOSEMITE_NATIONAL_PARK
11. Yosemite National Park – UNESCO World Heritage Centre, accessed May 2, 2025, https://whc.unesco.org/en/list/308/
12. NPS Geodiversity Atlas—Yosemite National Park, California, accessed May 2, 2025, https://www.nps.gov/articles/nps-geodiversity-atlas-yosemite-national-park.htm
13. Yosemite National Park – UNESCO World Heritage Centre, accessed May 2, 2025, https://whc.unesco.org/document/153154
14. Yosemite National Park | World Heritage Outlook, accessed May 2, 2025, https://worldheritageoutlook.iucn.org/explore-sites/yosemite-national-park
15. YOSEMITE NATIONAL PARK – World Heritage Datasheet, accessed May 2, 2025, https://yichuans.github.io/datasheet/output/site/yosemite-national-park
16. History of the Yosemite area – Wikipedia, accessed May 2, 2025, https://en.wikipedia.org/wiki/History_of_the_Yosemite_area
17. Yosemite National Park – Wikipedia, accessed May 2, 2025, https://en.wikipedia.org/wiki/Yosemite_National_Park
18. History & Culture – Yosemite National Park (U.S. National Park …, accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/index.htm
19. Geology of Yosemite National Park | U.S. Geological Survey, accessed May 2, 2025, https://www.usgs.gov/geology-and-ecology-of-national-parks/geology-yosemite-national-park
20. Geology – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/geology.htm
21. Yosemite N.P. | GeologyVirtualTrips, accessed May 2, 2025, https://www.geologyvirtualtrips.com/yosemite-n-p
22. Yosemite Science | U.S. Geological Survey – USGS.gov, accessed May 2, 2025, https://www.usgs.gov/news/featured-story/yosemite-science
23. Geology of Western National Parks: Yosemite, CA – Smithsonian Associates, accessed May 2, 2025, https://smithsonianassociates.org/ticketing/attachments/257775/pdf/YosemiteHandout
24. How did Half Dome, the massive rock monument in Yosemite National Park, acquire its unique shape? | U.S. Geological Survey – USGS.gov, accessed May 2, 2025, https://www.usgs.gov/faqs/how-did-half-dome-massive-rock-monument-yosemite-national-park-acquire-its-unique-shape
25. Geologic history of the Yosemite Valley – USGS.gov, accessed May 2, 2025, https://www.usgs.gov/publications/geologic-history-yosemite-valley
26. Climate Change – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/climate-change.htm
27. Climate Change: Snowpack and Waterfalls – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/ccsnowpack.htm
28. Yosemite National Park: World Heritage Site, accessed May 2, 2025, https://www.nps.gov/articles/yosemite-national-park-california.htm
29. Regional Information – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/gateways.htm
30. ParkPlanning – Visitor Access Management Plan – National Park Service, accessed May 2, 2025, https://parkplanning.nps.gov/yosemitevisitoraccess
31. Yosemite in 2023: Looking Back, accessed May 2, 2025, https://yosemite.org/yosemite-in-2023/
32. Visitor Access Management Plan – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/visitoraccessmanagement.htm
33. Yosemite National Park Visitor Access Management Draft Plan and Environmental Assessment, accessed May 2, 2025, https://npshistory.com/publications/yose/vamp-ea-draft-2024.pdf
34. Wilderness Stewardship Plan – National Park Service, accessed May 2, 2025, https://parkplanning.nps.gov/yosewild
35. general management plan visitor use/park operations/development, accessed May 2, 2025, https://www.nps.gov/yose/learn/management/upload/YOSE_104_D1316B_-id338162.pdf
36. Yosemite Valley – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/yv.htm
37. Museums, Historic Buildings, and Cemeteries – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/historic.htm
38. Day Hikes in Tuolumne Meadows – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/tmhikes.htm
39. Tuolumne Area Day Hikes – NPS History, accessed May 2, 2025, https://www.npshistory.com/publications/yose/brochures/day-hikes-tuolumne-2014.pdf
40. Tuolumne Meadows Map and Area Information – NPS History, accessed May 2, 2025, https://npshistory.com/publications/yose/brochures/day-hikes-tuolumne-2016.pdf
41. Lembert Dome and Dog Lake Trailhead – National Park Service, accessed May 2, 2025, https://www.nps.gov/places/000/lembert-dome-and-dog-lake-trailhead.htm
42. Yosemite History Center – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/historycenter.htm
43. Take the Fossils To Falls Road Trip – Visit Yosemite | Madera County, accessed May 2, 2025, https://www.yosemitethisyear.com/fossils-to-falls-road-trip
44. Scenic Vista Management Plan – Yosemite – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/vista.htm
45. Day Hikes in Wawona and Mariposa Grove – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/wawonahikes.htm
46. Mariposa Grove of Giant Sequoias – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/mg.htm
47. The Mariposa Grove of Giant Sequoias – Yosemite Hikes, accessed May 2, 2025, https://www.yosemitehikes.com/southern-yosemite/mariposa-grove/mariposa-grove.htm
48. Mariposa Grove of Giant Sequoias Visitors Guide (YOSEMITE) — Flying Dawn Marie | Travel blog, guides & itineraries for adventurous travellers, accessed May 2, 2025, https://www.flyingdawnmarie.com/new-blog/yosemite-mariposa-grove-sequoias
49. Plants – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/plants.htm
50. Mariposa Grove Trail Map – Yosemite Hikes, accessed May 2, 2025, https://www.yosemitehikes.com/southern-yosemite/mariposa-grove/trail-map.htm
51. Hetch Hetchy Environmental Debates – National Archives, accessed May 2, 2025, https://www.archives.gov/legislative/features/hetch-hetchy
52. The Hetch Hetchy Timeline – John Muir National Historic Site (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/jomu/learn/historyculture/the-hetch-hetchy-timeline.htm
53. The Fight for Hetch Hetchy | Environment & Society Portal, accessed May 2, 2025, https://www.environmentandsociety.org/tools/keywords/fight-hetch-hetchy
54. Current Conditions – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/conditions.htm
55. Campgrounds and Other Projects – Mission 66 – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/campgrounds-other-m66.htm
56. Campground Reservations – Yosemite National Park (U.S. National …, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/camping.htm
57. Yosemite Guide – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/guide.htm
58. Yosemite National Park | World Heritage Sites, accessed May 2, 2025, https://worldheritagesites.net/yosemite-national-park/
59. Things To Do – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/things2do.htm
60. Plan Your Visit – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/index.htm
61. Animals – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/animals.htm
62. Mammals – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/mammals.htm
63. Forest Restoration – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, http://home.nps.gov/yose/learn/nature/forestrestoration.htm
64. Ecological Restoration – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/ecorestoration.htm
65. Environmental Issues – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/environmentalfactors.htm
66. What Yosemite looks like in 2100 with climate change – SFGATE, accessed May 2, 2025, https://www.sfgate.com/california-parks/article/How-climate-change-will-affect-Yosemite-16920719.php
67. OF YOSEMITE – National Park Service History Electronic Library & Archive, accessed May 2, 2025, https://npshistory.com/nature_notes/yose/v33n8.pdf
68. Museums & Exhibits | Discover Yosemite National Park, accessed May 2, 2025, https://www.yosemite.com/things-to-do/arts-and-culture/museums/
69. Yosemite visitor centers – Mary Donahue, accessed May 2, 2025, https://marydonahue.org/yosemite-visitor-centers
70. Planning – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/planning.htm
71. The Beginner’s Guide to Yosemite’s Draft Visitor Access Management Plan, accessed May 2, 2025, https://yosemite.org/yosemite-visitor-access-management-plan/
72. Museum Exhibits – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/museum-exhibit.htm
73. John Muir Contests the Hetch-Hetchy Dam – History Matters, accessed May 2, 2025, https://historymatters.gmu.edu/d/5720
74. Half Dome Permit Lottery Statistics – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/hdpermitsapps.htm
75. Buffalo Soldiers – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/buffalo-soldiers.htm
76. Buffalo Soldiers – Charles Young Buffalo Soldiers National Monument (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/chyo/learn/historyculture/buffalo-soldiers.htm?ms=infkj#!&ms=fb_share#!&ms=fb_share&ms=fb_share#!&ms=fb_share&ms=fb_share#!
77. Buffalo Soldiers (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/articles/buffalo-soldiers.htm
78. BUFFALO SOLDIERS IN YOSEMITE, accessed May 2, 2025, https://yosemite.org/wp-content/uploads/d7/useruploads/SS13%20Buffalo%20Soldier%20Final.pdf
79. Coalition Submits Comments on Yosemite National Park Visitor Access Management Draft Plan, accessed May 2, 2025, https://protectnps.org/2024/09/27/coalition-submits-comments-on-yosemite-national-park-visitor-access-management-draft-plan/
80. Climate Change Impacts to National Parks: Responding to the Challenge, accessed May 2, 2025, https://www.energy.senate.gov/services/files/4DBD2E2D-0321-7E42-125B-B1B46DA74C25
81. Mission 66 in Yosemite – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/mission-66.htm
82. Bear Management – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/bear-management.htm
83. Yosemite Valley Visitor Center – Mission 66 – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/valley-vc-m66.htm
84. www.nps.gov, accessed May 2, 2025, https://www.nps.gov/yose/learn/historyculture/mission-66.htm#:~:text=Work%20in%20Yosemite%20during%20Mission,shutting%20down%20obsolete%20maintenance%20operations.
85. Mission 66 Plan Is Implemented | EBSCO Research Starters, accessed May 2, 2025, https://www.ebsco.com/research-starters/history/mission-66-plan-implemented
86. NPS PEPC – Yosemite NP – All Docs and Projects – National Park Service, accessed May 2, 2025, https://parkplanning.nps.gov/yose
87. Fire Management – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/wildlandfire.htm
88. Fire Management Plan – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/fireplan.htm
89. Managing Wildfire, Prescribed Fire, and Fuels – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/fuelsmanagement.htm
90. Fire Management Plan – Record of Decision – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/fmprod.htm
91. Final Environmental Impact Statement/Fire Management Plan, Yosemite National Park, Mariposa, Madera and Tuolumne Counties, CA; Notice of Approval of Record of Decision – Federal Register, accessed May 2, 2025, https://www.federalregister.gov/documents/2004/09/16/04-20840/final-environmental-impact-statementfire-management-plan-yosemite-national-park-mariposa-madera-and
92. Yosemite National Park seeks public input on draft visitor access management plan, accessed May 2, 2025, https://www.nps.gov/yose/learn/news/yosemite-national-park-seeks-public-input-on-draft-visitor-access-management-plan.htm
93. Yosemite Visitor Access Management Plan | Mono County California, accessed May 2, 2025, https://monocounty.ca.gov/yosemite-visitor-access-management-plan
94. Visitor Access Management Plan Public Comment Summary Report – National Park Service, accessed May 2, 2025, https://parkplanning.nps.gov/showFile.cfm?sfid=723834&projectID=113113
95. Visitor Access Management Plan – Virtual Public Meeting: January 17, 2023 – National Park Service, accessed May 2, 2025, https://www.nps.gov/media/video/view.htm?id=31713963-45D1-4841-A2F0-A1DB379BA633
96. The Facts About Resource Stewardship Strategies – National Park Service, accessed May 2, 2025, https://home.nps.gov/goga/learn/management/upload/RSS-Fact-Sheet.pdf
97. Final Yosemite Valley Plan Supplemental Environmental Impact Statement, accessed May 2, 2025, https://npshistory.com/publications/yose/yosemite-valley-plan/vol-1a.pdf
98. Planning – Climate Change (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/subjects/climatechange/planning.htm
99. Foundation Document – Yosemite National Park, accessed May 2, 2025, https://www.nps.gov/yose/getinvolved/upload/YOSE_FoundationDocument_2016_508.pdf
100. Climate Change and National Parks | U.S. Department of the Interior, accessed May 2, 2025, https://www.doi.gov/ocl/hearings/111/ClimateChangeInNatlParks_102809
101. Volume 40, Issue 1, 2024 – Parks Stewardship Forum, accessed May 2, 2025, https://escholarship.org/uc/psf/40/1
102. Guide to the NPS Paleontology Program Records – National Park Service, accessed May 2, 2025, https://www.nps.gov/articles/000/guide-to-the-nps-paleontology-program-records.htm
103. Paleontological Resource Inventory – Fossils and Paleontology (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/subjects/fossils/inventory.htm
104. FROM MICROFOSSILS TO MEGAFAUNA: AN OVERVIEW OF THE TAXONOMIC DIVERSITY OF NATIONAL PARK SERVICE FOSSILS, accessed May 2, 2025, http://npshistory.com/publications/paleontology/nmmnhs-82-437.pdf
105. High Sierra Nevada Fossil Plants, Alpine County, California, accessed May 2, 2025, https://inyo3.coffeecup.com/highsierra/highsierra.html
106. Fossils From Pleistocene Lake Manix, California – My Stream, accessed May 2, 2025, https://inyo.coffeecup.com/site/manix/manixlakebeds.html
107. Ice Age Fossils – Nevada State Parks, accessed May 2, 2025, https://parks.nv.gov/parks/ice-age-fossils
108. Paleontology in Nevada – Wikipedia, accessed May 2, 2025, https://en.wikipedia.org/wiki/Paleontology_in_Nevada
109. Paleontology in California – Wikipedia, accessed May 2, 2025, https://en.wikipedia.org/wiki/Paleontology_in_California
110. Exploring California’s fossil history, accessed May 2, 2025, https://ucmp.berkeley.edu/about/ucmpnews/08_05/exploring08_05.php
111. Nature & Wildlife | Yosemite National Park CA | TravelYosemite.com, accessed May 2, 2025, https://www.travelyosemite.com/plan/nature-wildlife/
112. Yosemite Conservancy Volunteer Programs, accessed May 2, 2025, https://yosemite.org/projects/yosemite-conservancy-volunteer-programs-2025/
113. Songbird Science – Yosemite Conservancy, accessed May 2, 2025, https://yosemite.org/projects/songbird-science-2025/
114. Acorn Woodpecker – Yosemite – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/blogs/acorn-woodpecker.htm
115. Climate Change: Shifting Ecosystems – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/ccecosystems.htm
116. Yosemite National Park | Audubon, accessed May 2, 2025, https://www.audubon.org/climate/national-parks/yosemite-national-park
117. Bears and Food Storage – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/bears.htm
118. Bear Facts – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/bearfacts.htm
119. Bears – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/bears.htm
120. Black Bear Management Trends – Mary Donahue, accessed May 2, 2025, https://marydonahue.org/black-bear-management-trends
121. Yosemite National Park: the continuous evolution of human–black bear conflict management – DigitalCommons@USU, accessed May 2, 2025, https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1310&context=hwi
122. Final Report: Bear Element Assessment Focused on Human-Bear Conflicts in Yosemite National Park, accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/upload/bearstudy-bears-reduce.pdf
123. Sierra Nevada Bighorn Sheep (Ovis canadensis sierrae) | U.S. Fish & Wildlife Service, accessed May 2, 2025, https://www.fws.gov/species/sierra-nevada-bighorn-sheep-ovis-canadensis-sierrae
124. Sierra Nevada Bighorn Sheep Recovery Program, accessed May 2, 2025, https://wildlife.ca.gov/Conservation/Mammals/Bighorn-Sheep/Sierra-Nevada/Recovery-Program
125. Sierra Nevada Bighorn Sheep Facts – California Department of Fish and Wildlife, accessed May 2, 2025, https://wildlife.ca.gov/Conservation/Mammals/Bighorn-Sheep/Sierra-Nevada/Recovery-Program/Sheep-Facts
126. Species Profile for Sierra Nevada bighorn sheep(Ovis canadensis sierrae) – ECOS, accessed May 2, 2025, https://ecos.fws.gov/ecp/species/3646
127. Providing for Yosemite’s Future — Yosemite Conservancy, accessed May 2, 2025, https://yosemite.org/
128. Birdwatching – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://home.nps.gov/yose/planyourvisit/birdwatching.htm
129. Climbing Hub – Yosemite Conservancy, accessed May 2, 2025, https://yosemite.org/experience/climbing/
130. Acorn Woodpecker Overview, All About Birds, Cornell Lab of Ornithology, accessed May 2, 2025, https://www.allaboutbirds.org/guide/Acorn_Woodpecker/overview
131. Acorn Woodpecker – American Bird Conservancy, accessed May 2, 2025, https://abcbirds.org/bird/acorn-woodpecker/
132. Birds of Yosemite National Park (1954, 1963) by Cyril A. Stebbins and Robert C. Stebbins, accessed May 2, 2025, https://www.yosemite.ca.us/library/birds_of_yosemite/birds_of_yosemite.pdf
133. Steller’s Jay Overview, All About Birds, Cornell Lab of Ornithology, accessed May 2, 2025, https://www.allaboutbirds.org/guide/Stellers_Jay/overview
134. Steller’s Jay National Park Wildlife, accessed May 2, 2025, https://nationalparkphotographer.com/stellers-jay/
135. yosebirdchecklist.pdf – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/upload/yosebirdchecklist.pdf
136. Invasive Species – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/invasive-species.htm
137. Invasive Plant Management – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/invasiveplantmanagement.htm
138. Yosemite National Park Climate Friendly Parks Action Plan, accessed May 2, 2025, https://www.nps.gov/subjects/climatechange/upload/YOSE_CFP_Action_Plan_508Compliant.pdf
139. National Parks’ grandeur degraded by global warming – EHN.org, accessed May 2, 2025, https://www.ehn.org/yosemite-national-park-wildfire
140. Adapt to Change – Climate Change (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/subjects/climatechange/adaptation.htm
141. Inflation Reduction Act: Ecosystem Resilience – Infrastructure (U.S. National Park Service), accessed May 2, 2025, http://home.nps.gov/subjects/infrastructure/ecosystem_resilience.htm
142. NPS Climate Change Response Strategy 2023 Update – National Park Service, accessed May 2, 2025, https://www.nps.gov/subjects/climatechange/upload/NPSClimateChangeResponseStrategy2023.pdf
143. National park research fellowships increase capacity and creativity in responding to climate change – PSF, accessed May 2, 2025, https://parks.berkeley.edu/psf/?p=1736
144. Yosemite Fire Management Plan Amendment – National Park Service, accessed May 2, 2025, https://parkplanning.nps.gov/document.cfm?documentID=76555
145. NPS Park Planning, Planning Catalog – National Park Service, accessed May 2, 2025, https://www.nps.gov/orgs/1804/upload/Planning_Catalog_508_2021-0211.pdf
146. News Releases – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/learn/news/newsreleases.htm
147. Fire Management Records – Online Archive of California, accessed May 2, 2025, https://oac.cdlib.org/findaid/ark:/13030/c88s4vfm/
148. Human-Bear Management Plan, Yosemite National Park – NPS History, accessed May 2, 2025, https://npshistory.com/publications/yose/bear-mgt-1975.pdf
149. Fees & Passes – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/fees.htm
150. Wilderness Climbing Permits – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/climbingpermits.htm
151. Bears & Food Storage While Backpacking – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/bearcanisters.htm
152. Not allowed bear spray? : r/Yosemite – Reddit, accessed May 2, 2025, https://www.reddit.com/r/Yosemite/comments/1cmsjm1/not_allowed_bear_spray/
153. Entrance Reservations – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/reservations.htm
154. Directions – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/directions.htm
155. Climate Change: How is the park responding? – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/learn/nature/ccparkresponse.htm
156. Yosemite Valley Loop Trail – National Park Service, accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/valleylooptrail.htm
157. Upper Yosemite Falls Hike – HikingGuy.com, accessed May 2, 2025, https://hikingguy.com/hiking-trails/yosemite-hikes/upper-yosemite-falls-hike/
158. Making Yosemite More Environmentally Resilient, accessed May 2, 2025, https://yosemite.org/environmental-resilience/
159. Eating & Sleeping – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/eatingsleeping.htm
160. Vernal Fall and Nevada Fall Trails – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/vernalnevadatrail.htm
161. Mist Trail and John Muir Trail Trailhead – National Park Service, accessed May 2, 2025, https://www.nps.gov/places/000/mist-trail-and-john-muir-trail-trailhead.htm
162. Lodging – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/lodging.htm
163. Half Dome | Yosemite Hikes, accessed May 2, 2025, https://www.yosemitehikes.com/yosemite-valley/half-dome/half-dome.htm
164. Yosemite National Park, accessed May 2, 2025, https://npshistory.com/publications/yose/brochures/half-dome-cable-permits-2017.pdf
165. Hiking Half Dome at Yosemite National Park, accessed May 2, 2025, https://www.yosemite.com/things-to-do/half-dome-hike/
166. Half Dome Permits, Yosemite National Park – Recreation.gov, accessed May 2, 2025, https://www.recreation.gov/permits/234652
167. Climbing Regulations – Yosemite National Park (U.S. National Park Service), accessed May 2, 2025, https://www.nps.gov/yose/planyourvisit/climbing_regulations.htm
168. Yosemite Wilderness Climbing Permits: What You Need to Know – Access Fund, accessed May 2, 2025, https://www.accessfund.org/latest-news/news-and-events/news/yosemite-wilderness-climbing-permits-what-you-need-to-know
169. Yosemite Lodging, accessed May 2, 2025, https://www.travelyosemite.com/lodging/yosemite-lodging-experience
170. Accessibility Information | Yosemite National Park CA – TravelYosemite.com, accessed May 2, 2025, https://www.travelyosemite.com/plan/travel-tips/accessibility-information/
171. Yosemite Guide for Mobility-Challenged Visitors, accessed May 2, 2025, https://www.yosemite.com/yosemite-mariposa-stories/yosemite-guide-for-mobility-challenged-visitors/
172. Top 10 Hotels in El Portal, CA, accessed May 2, 2025, https://www.hotels.com/de1479077/hotels-el-portal-california/
173. Top 10 Hotels in Yosemite National Park, CA, accessed May 2, 2025, https://www.hotels.com/de1695721/hotels-yosemite-national-park-california/
174. Best Places to Stay Near Yosemite, accessed May 2, 2025, https://www.yosemite.com/places-to-stay-near-yosemite/
175. Hotels in Yosemite National Park near Yosemite South Entrance Fish Camp, accessed May 2, 2025, https://www.hotelsinyosemitenationalpark.com/en/near-yosemite-south-entrance-1751087/
176. Yosemite National Park Lodging – Tenaya at Yosemite, accessed May 2, 2025, https://www.visittenaya.com/
177. Yosemite Resorts | Rush Creek Lodge & Spa, accessed May 2, 2025, https://www.rushcreeklodge.com/