Tag: Mono County

Mono County, California, is a stunning region nestled in the eastern Sierra Nevada mountains, renowned for its breathtaking natural landscapes and outdoor recreational opportunities. This sparsely populated county boasts diverse terrain, including majestic peaks like Mammoth Mountain and the rugged beauty of the Mono Basin. Its jewel, Mono Lake, with its iconic tufa towers, attracts photographers and nature enthusiasts alike. The county is a haven for outdoor activities year-round, offering world-class skiing and snowboarding in winter and superb hiking, fishing, and camping in summer. The region also preserves a rich cultural heritage, with historic mining towns like Bodie State Historic Park providing glimpses into its past. With its combination of natural beauty and recreational offerings, the area captivates visitors seeking both adventure and tranquility in California’s wilderness.

Lake Mamie – Mammoth Lakes

Posted on June 7, 2026 by Destination4x4

Lake Mamie is a small, scenic alpine lake in the Mammoth Lakes Basin of the Eastern Sierra Nevada, Mono County, California. It is one of the chain of lakes accessible via Lake Mary Road, just a few miles from the town of Mammoth Lakes.

Paddle boardes enjoy the quiet calm of Lake Mamie, Mammoth Lakes, Inyo National Forest. Photo by James L Rathbun

Location and Access

Lake Mamie sits at approximately 8,900–8,901 feet (about 2,713 meters) elevation, nestled in a sub-alpine forested setting between larger Lake Mary (to the west/upstream) and Horseshoe Lake (to the east). It is easily reachable by car along Lake Mary Road (about 3–3.5 miles from town), with parking and trail access near the Twin Falls Overlook or along the Lakes Basin Path. In summer, facilities like Wildyrie Lodge/cabins nearby offer boat rentals, tackle, and snacks. Winter access is by ski or snowshoe only.

The lake forms part of the broader Mammoth Lakes Basin, a large glacial cirque carved by ancient ice and featuring rugged peaks, including views of Crystal Crag and Mammoth Mountain.

Physical Description

Size: Roughly 19 acres, making it the smallest lake in the Mammoth Lakes Basin. It has a relatively short shoreline (about half a mile), which contributes to its intimate, protected feel.
Depth: Shallow, generally around 8–10 feet or so at its deeper points, with excellent water clarity. This shallowness supports good visibility and makes it suitable for certain activities while limiting others (e.g., no motorboats).
Hydrology: Water flows in from Lake Mary through a canopy of evergreens at the inlet. The outlet feeds a spillway/waterfall that drops toward Twin Lakes below. A dam influences water levels, and the lake is part of the connected basin system.
Surroundings: Surrounded by towering pines, evergreens, and sub-alpine forest. It lies in a glacial moraine setting within the broader Sierra Nevada landscape shaped by volcanism (including Mammoth Mountain) and glaciation.

The water is typically clear and calm, especially since motorboats are prohibited, preserving a tranquil environment.

Natural Beauty and Scenic Qualities

Lake Mamie is frequently praised for its jaw-dropping scenery despite its small size. It is framed by dense woods, with reflections of snow-capped peaks (like Crystal Crag) and granite features on its clear waters. The setting offers “breathtaking views at every angle,” with light playing across the surface, especially at sunrise, sunset, or from the road crossing above the dam.

One angler/author described it as having “perhaps one of the best views of any lake in the world.” The protected, wooded location makes it feel more intimate and secluded than larger neighboring lakes, with opportunities to spot wildlife such as deer, coyotes, waterfowl, and occasionally bears (especially in summer).

In fall, the area features vibrant colors; in winter, it transforms into a snowy wonderland accessible for cross-country skiing or snowshoeing. The easy accessibility combined with its peaceful character makes it ideal for photography, lounging, and quiet contemplation.

Ecology and Recreation

The lake supports fishing and is regularly stocked with trout, including rainbows, brookies, and notable browns/Alpers trout. It is popular for shore fishing, float tubes, canoes, and kayaks. Dusk is often cited as a prime time.

Other activities include picnicking at scenic spots (with views of Mammoth Mountain and the spillway), short loops or trails around the lake (e.g., an easy ~1-mile Lake Mamie Loop with minimal elevation gain), and general lounging. No swimming is allowed in the basin lakes. Nearby camping is available at sites like Twin Lakes.

History and Naming

The name “Mamie” has a couple of origin stories. One links it to Lake Mary (possibly after Queen Mary), with “Mamie” as a nickname or for a smaller related lake. Another ties it to colorful local figures from the area’s mining-era dancehall days. The basin itself has ties to mining history (e.g., nearby Mammoth Consolidated Mine) and was shaped by the Long Valley Caldera volcanism and glaciation.

Summary of Appeal

Lake Mamie stands out as a gem for those seeking serenity amid stunning alpine scenery. Its small size belies its visual impact and recreational value—offering clear waters, forested shores, mountain backdrops, and easy access without the crowds of larger lakes. Whether for a peaceful paddle, a productive fishing session, a family picnic, or simply soaking in the views, it exemplifies the natural beauty of the Mammoth Lakes area. Visitors should practice Leave No Trace principles, be aware of wildlife (including bears), and check conditions, as the high-elevation environment can change quickly.

This report draws from local tourism, trail, and recreation sources for an up-to-date overview as of 2026. For the latest access, fishing regulations, or safety info, consult Inyo National Forest or Visit Mammoth resources.

Twin Lakes – Mammoth Lakes

Posted on June 7, 2026 by Destination4x4

Twin Lakes in Mammoth Lakes, California, is a scenic pair of connected alpine lakes in the Mammoth Lakes Basin within the Inyo National Forest in Mono County. They sit at the base of the southeastern slope of Mammoth Mountain in the eastern Sierra Nevada.

Twin Lakes with its waterfall, located in Mammoth Lakes, CA. Photo by James L Rathbun

Physical Description and Geography

Twin Lakes are the lowest in the Mammoth Lakes Basin, with a surface elevation of approximately 8,563–8,600 feet (about 2,610 m). They are accessible by car year-round via Lake Mary Road and Twin Lakes Road, unlike many higher lakes in the basin.

The lakes are often described as a single body of water with a narrow “choke” or connection in the middle, sometimes bridged for visitors. They consist of an Upper and Lower Twin Lake, linked by the picturesque Twin Falls (also called Twin Lakes Falls), which cascades from the upper section (fed from Lake Mamie above) into the lower. The primary inflow is Twin Falls, and the primary outflow is Mammoth Creek, making the lakes the source of this waterway.

Scenic Twin Lakes waterfall and bridge, located in Mammoth Lakes, CA. Photo by James L Rathbun

One side features dramatic lava cliffs formed by eruptions of Mammoth Mountain, highlighting the area’s volcanic geology. The other side borders forested areas with the Twin Lakes Campground and Tamarack Lodge. The basin was shaped by glacial activity, with surrounding features like Panorama Dome.

Size details vary in sources, but they form a substantial alpine lake system (one reference notes around 108 acres for fishing purposes; related Twin Lakes in the region are larger). Depths reach up to around 40–55 feet in channels. The water is typically clear and cold, reflecting the high Sierra environment.

Scenic Beauty and Surroundings

Twin Lakes are renowned for their stunning natural beauty, nestled amid lodgepole pine forests, with views of Mammoth Mountain (elev. ~11,059 ft) and surrounding peaks. The area offers mirror-like reflections on calm days, especially at sunrise or early morning, and vibrant seasonal changes—green summers, golden aspens in fall, and snow-covered winter landscapes.

Twin Lakes from above, located in Mammoth Lakes, CA. Photo by James L Rathbun

The waterfall between the lakes (or from above) is a highlight, creating dramatic cascades visible from bridges, shores, and overlooks like Twin Falls Overlook. Panoramic views extend across the lakes to the town of Mammoth Lakes and beyond. The setting combines alpine lake serenity with volcanic rock formations and dense evergreen forests, often called part of the “California Alps” due to the rugged Sierra Crest and Sawtooth Ridge influences.

Visitors frequently praise the gorgeous scenery, clear water, and photo opportunities, with easy access enhancing its appeal. It feels pristine yet welcoming, with the scent of pines and mountain air.

Recreation and Amenities

Fishing: Popular for trout (stocked lakes); fish cleaning stations available.
Boating/Paddling: Boat rentals, kayaking, canoeing on the glassy waters.
Hiking/Biking: Lakeside paths, Lakes Basin Path (paved), connections to Mammoth Mountain trails, and nearby hikes like to Heart Lake or Panorama Dome.
Camping: Twin Lakes Campground with ~93 sites in three loops, suitable for tents and RVs, lakeside access.
Other: Tamarack Lodge (historic, with restaurant), general store, boat rentals, winter cross-country skiing, and an outdoor wedding chapel.

It’s family-friendly with easy access, though high elevation (~8,600 ft) requires acclimation for some.

History and Ecology

The area has volcanic and glacial history, with Mammoth Mountain’s lava domes and past mining activity nearby (e.g., Mammoth Consolidated Mine ruins). Ecologically, it supports trout fisheries and coniferous forests in a high-elevation environment.

Twin Lakes stands out as an accessible gem in the Mammoth Lakes area—beautiful year-round, with its connected waters, waterfall, volcanic backdrop, and forested shores creating a quintessential Sierra Nevada alpine scene that draws photographers, outdoor enthusiasts, and nature lovers.

For the most current conditions (e.g., road access, fishing regulations, or weather), check official sources like the U.S. Forest Service or Visit Mammoth.

Earthquake Fault

Posted on June 7, 2026 by Destination4x4

The Mammoth Earthquake Fault (or Earthquake Fissure) on Mammoth Mountain is a striking geological feature located in Inyo National Forest near Mammoth Lakes, California. It is a prominent, nearly straight fracture in the volcanic rock at the base of Mammoth Mountain, rather than a true fault with significant lateral or vertical displacement between the rock blocks.

Dimensions

Length: The visible fissure extends for several hundred feet (some descriptions note portions or related features along a longer alignment).
Width: Up to about 10 feet (roughly 6–10 feet in places, with sides that fit together like puzzle pieces when viewed closely).
Depth: Up to 60 feet.
It runs roughly north-south, cutting through hard, glassy rhyolite lava flows from Mammoth Mountain. The jagged, uneroded walls and lack of significant pumice fill indicate it is geologically young.

A short, easy 0.3-mile interpretive trail (mostly paved with some uneven stone steps) allows visitors to walk alongside and even descend into parts of the fissure. It sits at approximately 8,600 feet elevation in a forested area.

Geological History

The fissure formed primarily due to tectonic stresses in the Earth’s crust, associated with the ongoing volcanic and extensional activity in the Long Valley Caldera region. It is part of a broader system linked to the Mono-Inyo Craters volcanic chain.

Scientists estimate its formation occurred roughly 200–600 years ago (around 550–650 years ago in some accounts), during a period of intense volcanic unrest. This timeframe aligns with eruptions at the Inyo Craters, Inyo Domes, and related steam blasts and dome-building events. The fissure aligns with the dike (magma intrusion pathway) that fed some of these northern domes.

It is not the result of a single major earthquake but rather a fracture opened by crustal stretching and volcanic-related stresses. Trees growing in and around the fissure (some over 160 years old) confirm it has been open for at least that long, with its fresh appearance underscoring its relative youth in geologic terms.

The Mammoth Lakes area remains geologically active, part of the Long Valley Caldera system with a history of eruptions, earthquake swarms (notably in 1980 and 1989), and magma movement at depth. While this fissure itself is not directly tied to a specific historic quake, it highlights the region’s dynamic tectonic and volcanic environment, where future activity (magma rise or gradual infilling) remains possible.

Visitor Notes

The site is easily accessible off Highway 203, with parking, picnic tables, and interpretive signs. It offers a cool microclimate (cold air often rises from the depths, and snow can linger inside even in summer). Historically, local Native American groups reportedly used the fissure for food storage due to its natural refrigeration. Always practice Leave No Trace, watch your footing on the trail, and respect any seasonal closures or warnings.

This feature provides an excellent, hands-on look at the powerful forces shaping the eastern Sierra Nevada. For current conditions, check the Inyo National Forest website or visitor centers in Mammoth Lakes.

Saddlebag Lake

Posted on June 6, 2026 by Destination4x4

Saddlebag Lake, located in the Eastern Sierra Nevada near the Tioga Pass entrance to Yosemite National Park, has a history shaped by Indigenous use, early exploration, mining, and modern recreation, reflecting its role as a high-altitude gem in California’s wilderness.

The resort at Sagglebad Lake, Inyo National Forest. Photo by James L Rathbun

Indigenous Presence

The area around Saddlebag Lake has been used for over 5,000 years by Indigenous groups, primarily the Mono Paiute and Washoe. These tribes relied on the region’s alpine resources, harvesting pinyon pine nuts, hunting bighorn sheep, and gathering medicinal plants during summer months. The lake’s high elevation (10,087 feet) limited year-round habitation, but seasonal camps were established near springs and lakes in the Hoover Wilderness. Archaeological evidence, such as grinding stones and petroglyphs, is present in nearby areas like Mono Lake and Yosemite, though specific sites at Saddlebag Lake are less documented due to its rocky terrain. The Mono Paiute, part of the broader Paiute culture, referred to the region as a place of “high water” in oral traditions, valuing its clear lakes and streams. Their descendants, including the Bridgeport Paiute Indian Community, maintain cultural ties to the Eastern Sierra.

European Exploration and Mining

European-American contact began in the mid-19th century during California’s Gold Rush. In the 1850s, prospectors and surveyors traversed the Sierra Nevada, with the Tioga Pass area explored as a route to Yosemite. Saddlebag Lake’s name likely derives from its saddle-like shape or the saddlebags used by miners and pack trains, though exact origins are unclear. In the 1870s–1880s, small-scale mining occurred in the Tioga Pass region, targeting gold and silver, with the nearby Tioga Mine (abandoned by the early 20th century) leaving remnants like ore carts and shafts. The lake itself was dammed in 1919 by the Southern California Edison Company to create a reservoir for hydroelectric power, raising its water level and expanding its surface area to approximately 600 acres. This dam, still visible, altered the natural basin, enhancing its role as a water source and fishery.

Modern Recreation and Conservation

The crystal clear waters of Saddlebag Lake, Inyo National Forest. Photo by James L Rathbun

By the early 20th century, Saddlebag Lake became a destination for anglers and hikers, drawn to its trout-filled waters and access to the Hoover Wilderness. The construction of Tioga Pass Road (CA-120) in the 1910s, and its paving by 1961, made the lake accessible to vehicles, spurring tourism. The Saddlebag Lake Resort, established mid-20th century, offered cabins, a store, and a water taxi until its closure in recent years due to economic and environmental challenges. In 1964, the Wilderness Act designated the adjacent Hoover Wilderness, protecting the lake’s pristine surroundings. The Inyo National Forest, which manages the lake and its campground, emphasizes sustainable recreation, with regulations to protect water quality and wildlife. Today, Saddlebag Lake is a gateway to the Twenty Lakes Basin and a hub for outdoor enthusiasts, valued for its solitude and alpine beauty.

Geography

Saddlebag Lake lies in the Eastern Sierra Nevada, within the Inyo National Forest, just outside Yosemite National Park’s eastern boundary at Tioga Pass. Its geographical context is defined by its high elevation, glacial origins, and role as a transitional alpine feature.

Location and Access

Situated at 10,087 feet above sea level, Saddlebag Lake is California’s highest drive-to lake, located in Mono County, approximately 12 miles west of Lee Vining via CA-120 (Tioga Pass Road) and a 3-mile gravel spur, Saddlebag Lake Road. The lake sits in a glacial basin near the crest of the Sierra Nevada, with coordinates approximately 37.965°N, 119.272°W. It is accessible from:

Lee Vining (12 miles, 20 minutes): US-395 to CA-120 west, then north on Saddlebag Lake Road.
Los Angeles (320 miles, 5.5 hours): I-5 north to US-395, then CA-120 west.
Reno (150 miles, 3 hours): US-395 south to CA-120 west.

The gravel road is narrow and rough, requiring caution for low-clearance vehicles or RVs. The road closes from October to late June due to heavy snow, with exact dates varying (check fs.usda.gov/inyo).

Geological Context

Saddlebag Lake occupies a glacial cirque formed during the Pleistocene, when glaciers scoured the Sierra Nevada, leaving polished granite and moraines. The lake is part of the Lee Vining Creek watershed, feeding into Mono Lake via a series of streams and lakes in the Twenty Lakes Basin. The surrounding landscape features:

Mount Conness (12,590 feet): A prominent granite peak to the west, marking Yosemite’s boundary.
Tioga Crest (11,911 feet): Jagged peaks to the northeast, framing the lake.
Shepherd Crest: Rugged ridges to the east, part of the Hoover Wilderness.

The lake’s bedrock is primarily granite, with glacial erratics and talus slopes dotting the shores. The 1919 dam, a low concrete structure, raised the lake’s level, creating a reservoir that supports hydroelectric and recreational uses. The area’s faulted geology, part of the Sierra Nevada Fault system, contributes to its rugged terrain and occasional seismic activity.

Climate and Ecosystems

The lake’s high elevation creates an alpine climate with short summers (50–70°F, July–August), cold winters (0–30°F, with heavy snow), and mild spring/fall (30–50°F). Annual precipitation averages 20–30 inches, mostly as snow, with rare summer showers. Flash floods are uncommon but possible in nearby canyons. The ecosystem is subalpine, with sparse lodgepole pines, alpine meadows, and wildflowers like lupine and Indian paintbrush (July–August). Wildlife includes marmots, pika, mule deer, black bears, and birds like Clark’s nutcrackers. Saddlebag Lake supports rainbow, brook, and brown trout, stocked historically for fishing. Its clear skies and minimal light pollution make it a stargazing hotspot, part of the region’s International Dark Sky Park efforts.

Description of Saddlebag Lake

Saddlebag Lake, a 600-acre reservoir at 10,087 feet, is a pristine alpine jewel in the Eastern Sierra Nevada, renowned for its crystal-clear waters, dramatic surroundings, and recreational allure. The lake’s elongated, saddle-like shape stretches roughly 1.5 miles long and 0.5 miles wide, nestled in a rocky basin carved by ancient glaciers. Its shores are stark, with granite boulders, sparse pines, and patches of alpine grass, giving it a raw, almost lunar aesthetic. The water, fed by snowmelt from surrounding peaks, is strikingly clear, reflecting Mount Conness, Tioga Crest, and the deep blue sky. On calm days, the lake mirrors the jagged skyline, creating a postcard-perfect scene, while breezy days add ripples that catch the sunlight.

The lake’s dam, built in 1919, is a low, utilitarian structure at the southern end, blending into the rocky landscape. The water supports a thriving fishery, with rainbow, brook, and brown trout attracting anglers (California fishing license required). A seasonal water taxi (cash only, when operating) ferries hikers across to trailheads, reducing the 3.9-mile Saddlebag Lake Loop trail to a shorter crossing. This trail circles the lake, offering views of Shamrock Lake, Greenstone Lake, and cascading streams, with wildflowers dotting the path in summer. The lake is a gateway to the Twenty Lakes Basin, a 7.5-mile loop through the Hoover Wilderness, passing alpine lakes like Steelhead and Cascade, framed by granite massifs and meadows.

Recreationally, Saddlebag Lake excels for fishing, hiking, and non-motorized boating (15 mph limit). Kayakers and canoeists glide across its calm waters, while anglers cast from the shore or small boats. The lake’s high elevation ensures crisp air and intense sunlight, requiring sunscreen and hydration. At night, the absence of light pollution reveals a dazzling starfield, with the Milky Way prominent on moonless nights, as noted by a 2023 camper: “The stars over Saddlebag were unreal” (TheDyrt.com). The lake’s proximity to Saddlebag Lake Campground (20 sites) and its trailhead status make it a hub for adventurers, yet its remoteness preserves a sense of solitude compared to Yosemite’s crowds.

Travel Notes

Access: The lake is reached via a 3-mile gravel road off CA-120, suitable for most vehicles but challenging for large RVs. High-clearance recommended for backroads to nearby lakes.
Season: Open late June to September, weather permitting. Check Inyo National Forest for road status.
Activities: Hiking (Twenty Lakes Basin, Saddlebag Lake Loop), fishing (trout), boating (kayaks, canoes), and stargazing. A water taxi may operate seasonally.
Safety: High elevation requires acclimatization to avoid altitude sickness. Carry 1 gallon of water per person per day, sunscreen, and warm layers (nights drop to 30–40°F). Black bears are present; use bear lockers at the campground.
Nearby Attractions: Yosemite National Park (20 minutes to Tioga Pass entrance), Mono Lake (15 minutes), and Lee Vining Canyon for scenic drives.
Sources: Inyo National Forest (fs.usda.gov), NPS.gov, TheDyrt.com, Tripadvisor, MonoCounty.org, California’s Best Camping.

Conclusion

Saddlebag Lake, at 10,087 feet in the Eastern Sierra Nevada, is a stunning alpine reservoir with a rich history of Indigenous use, mining, and modern recreation. Its glacial geology, framed by Mount Conness and Tioga Crest, creates a dramatic setting, while its clear waters and trout fishery draw anglers and boaters. The lake’s role as a trailhead for the Twenty Lakes Basin and its starry skies make it a haven for hikers and stargazers. Despite its dam-altered origins, Saddlebag Lake retains a wild, pristine character, offering solitude and beauty just outside Yosemite. Preparation for high altitude and variable weather ensures a safe, unforgettable visit to this High Sierra gem.

Sources: fs.usda.gov/inyo, NPS.gov, TheDyrt.com, Tripadvisor, MonoCounty.org, California’s Best Camping, Islands.com, USGS.gov

Inyo National Forest

Posted on May 29, 2026 by Destination4x4

Inyo National Forest is a vast and spectacular United States National Forest in the eastern Sierra Nevada of California, with a small portion extending into western Nevada. Established in 1907 by President Theodore Roosevelt, it covers approximately 1.9 million acres (about 2,974 square miles) and stretches roughly 165 miles along the California-Nevada border, between the Los Angeles and Reno areas.

Rock Creek Lake is located at 9,600 feet in the Eastern High Sierra.

It is often described as a “land of superlatives” due to its extraordinary natural features:

Mount Whitney — the highest peak in the contiguous United States at 14,494–14,505 feet.
The Ancient Bristlecone Pine Forest in the White Mountains, home to the oldest living trees on Earth (some over 4,000–5,000 years old).
Mono Lake, one of the oldest inland lakes in North America.
Dramatic eastern Sierra escarpment, high desert landscapes, glaciers, alpine meadows, and rugged peaks.

Geography and Ecology

The forest primarily occupies the eastern slopes of the Sierra Nevada and parts of the White Mountains. Elevations range from about 4,000 feet in the Owens Valley to over 14,000 feet at the highest summits. It includes nine designated wilderness areas protecting over 800,000 acres, such as the popular John Muir Wilderness.

Despite its name, much of the forest is relatively sparsely wooded compared to other national forests, as it encompasses significant high-desert and alpine terrain. It features over 400 lakes, more than 1,100 miles of rivers and streams, and diverse habitats supporting species like bighorn sheep, golden trout, and unique high-elevation flora.

Recreation and Attractions

Fishing Rock Creek at French Camp, High Sierra, CA

Inyo National Forest offers year-round outdoor opportunities:

Hiking and Backpacking — Iconic trails, including routes to Mount Whitney. The John Muir Trail and Pacific Crest Trail pass through sections of the forest.
Winter Sports — Skiing and snowboarding at resorts like Mammoth Mountain, plus groomed trails for cross-country skiing and snowmobiling.
Water Activities — Excellent fishing, boating, and scenic visits to Mono Lake.
Other Pursuits — Mountain biking, off-roading (with thousands of miles of roads and trails), camping, horseback riding, and stargazing.

Popular destinations within or adjacent to the forest include Mammoth Lakes, the Ancient Bristlecone Pine Forest (Schulman Grove), and various scenic drives and campgrounds.

Management and Access

The forest is managed by the U.S. Forest Service and divided into northern and southern zones with multiple ranger districts. It borders areas near Yosemite and Sequoia National Parks, making it part of a larger spectacular recreational region. Wilderness permits are often required for certain areas, especially for overnight trips.

Inyo National Forest stands out for its raw, high-elevation beauty, stark contrasts between desert and alpine environments, and world-renowned natural wonders. It provides a remote yet accessible escape for those seeking adventure, solitude, and awe-inspiring scenery in California’s Eastern Sierra. For the latest conditions, permits, and details, visit the official USDA Forest Service site at fs.usda.gov/inyo.

Inyo National Forest Campgrounds

Inyo National Forest Campgrounds offer a wide variety of scenic, developed camping experiences across nearly 2 million acres of the eastern Sierra Nevada and White Mountains in California. Managed by the USDA Forest Service, these campgrounds provide access to stunning landscapes including alpine lakes, meadows, volcanic features (like Devils Postpile), high peaks such as Mount Whitney, ancient bristlecone pines, and trails in wilderness areas like the John Muir and Ansel Adams Wilderness.