Plumas County is a county in the Sierra Nevada of the U.S. state of California. As of the 2020 census, the population was 19,790. The county seat is Quincy, and the only incorporated city is Portola. The largest community in the county is East Quincy. The county was named for the Spanish Río de las Plumas, which flows through it. The county itself is also the namesake of a native moth species, Hadena plumasata.
Sierra County is a county located in the U.S. state of California. As of the 2020 census, the population was 3,236, making it California's second-least populous county. The county seat is Downieville; the sole incorporated city is Loyalton. The county is in the Sierra Nevada, northeast of Sacramento on the border with Nevada.
The Humboldt–Toiyabe National Forest (HTNF) is the principal U.S. National Forest in the U.S. state of Nevada, and has a smaller portion in Eastern California. With an area of 6,289,821 acres (25,454.00 km2), it is the largest U.S. National Forest outside of Alaska.
The Mono–Inyo Craters are a volcanic chain of craters, domes and lava flows in Mono County, Eastern California. The chain stretches 25 miles (40 km) from the northwest shore of Mono Lake to the south of Mammoth Mountain. The Mono Lake Volcanic Field forms the northernmost part of the chain and consists of two volcanic islands in the lake and one cinder cone volcano on its northwest shore. Most of the Mono Craters, which make up the bulk of the northern part of the Mono–Inyo chain, are phreatic volcanoes that have since been either plugged or over-topped by rhyolite domes and lava flows. The Inyo volcanic chain form much of the southern part of the chain and consist of phreatic explosion pits, and rhyolitic lava flows and domes. The southernmost part of the chain consists of fumaroles and explosion pits on Mammoth Mountain and a set of cinder cones south of the mountain; the latter are called the Red Cones.
Lassen Volcanic National Park is an American national park in northeastern California. The dominant feature of the park is Lassen Peak, the largest plug dome volcano in the world and the southernmost volcano in the Cascade Range. Lassen Volcanic National Park is one of the few areas in the world where all four types of volcano can be found—plug dome, shield, cinder cone, and stratovolcano.
Lassen Peak, commonly referred to as Mount Lassen, is a lava dome volcano and the southernmost active volcano in the Cascade Range of the Western United States. Located in the Shasta Cascade region of Northern California, it is part of the Cascade Volcanic Arc, which stretches from southwestern British Columbia to northern California. Lassen Peak reaches an elevation of 10,457 ft (3,187 m), standing above the northern Sacramento Valley. It supports many flora and fauna among its diverse habitats, which are subject to frequent snowfall and reach high elevations.
The Blue Mountains are a mountain range in the northwestern United States, located largely in northeastern Oregon and stretching into extreme southeastern Washington. The range has an area of about 15,000 square miles (39,000 km2), stretching east and southeast of Pendleton, Oregon, to the Snake River along the Oregon–Idaho border.
The Feather River is the principal tributary of the Sacramento River, in the Sacramento Valley of Northern California. The river's main stem is about 73 miles (117 km) long. Its length to its most distant headwater tributary is just over 210 miles (340 km). The main stem Feather River begins in Lake Oroville, where its four long tributary forks join—the South Fork, Middle Fork, North Fork, and West Branch Feather Rivers. These and other tributaries drain part of the northern Sierra Nevada, and the extreme southern Cascades, as well as a small portion of the Sacramento Valley. The total drainage basin is about 6,200 square miles (16,000 km2), with approximately 3,604 square miles (9,330 km2) above Lake Oroville.
Clingmans Dome is a mountain in the Great Smoky Mountains of Tennessee and North Carolina in the southeastern United States. Its name in Cherokee is Kuwahi or Kuwohi, meaning "mulberry place." At an elevation of 6,643 feet (2,025 m), it is the highest mountain in the Great Smoky Mountains National Park, the highest point in the state of Tennessee, and the highest point along the 2,192-mile (3,528 km) Appalachian Trail. It is also the third highest point in mainland Eastern North America, after Mount Mitchell and Mount Craig.
The Unicoi Mountains are a mountain range rising along the border between Tennessee and North Carolina in the southeastern United States. They are part of the Blue Ridge Mountain Province of the Southern Appalachian Mountains. The Unicois are located immediately south of the Great Smoky Mountains and immediately west of the Cheoah Mountains. Most of the range is protected as a national forest, namely the Cherokee National Forest on the Tennessee side and the Nantahala National Forest on the North Carolina side— although some parts have been designated as wilderness areas and are thus more strictly regulated.
Tahoe National Forest is a United States National Forest located in California, northwest of Lake Tahoe. It includes the 8,587-foot (2,617 m) peak of Sierra Buttes, near Sierra City, which has views of Mount Lassen and Mount Shasta. It is located in parts of six counties: Sierra, Placer, Nevada, Yuba, Plumas and El Dorado. The forest has a total area of 871,495 acres. Its headquarters is in Nevada City, California. There are local ranger district offices in Camptonville, Foresthill, Sierraville and Truckee.
Mount Pinos is a mountain located in the Los Padres National Forest on the boundary between Ventura and Kern counties in California. The summit, at 8,847 feet (2,697 m), is the highest point in Ventura County. The mountain is the highest point of the Transverse Ranges west of Tejon Pass, as well as the southernmost point of the Salinian Block.
Granite domes are domical hills composed of granite with bare rock exposed over most of the surface. Generally, domical features such as these are known as bornhardts. Bornhardts can form in any type of plutonic rock but are typically composed of granite and granitic gneiss. As granitic plutons cool kilometers below the Earth's surface, minerals in the rock crystallize under uniform confining pressure. Erosion brings the rock closer to Earth's surface and the pressure from above the rock decreases; as a result the rock fractures. These fractures are known as exfoliation joints, or sheet fractures, and form in onionlike patterns that are parallel to the land surface. These sheets of rock peel off the exposed surface and in certain conditions develop domical structures. Additional theories on the origin of granite domes involve scarp-retreat and tectonic uplift.
Roan Mountain is a 6,285 ft (1,916 m) mountain straddling the North Carolina/Tennessee border in the Unaka Range of the Southern Appalachian Mountains in the Southeastern United States. The range's highpoint, Roan is clad in a dense stand of Southern Appalachian spruce-fir forest, and includes the world's largest natural rhododendron garden, and the longest stretch of grassy bald in the Appalachian range. The Roan Highlands also contain the highest quality remaining stretch of Fraser fir forest throughout the tree's entire range. The Cherokee National Forest and Pisgah National Forest converge atop the mountain, with Roan Mountain State Park located near its northern base. The Appalachian Trail traverses most of the Roan's crest. The Roan High Knob Shelter is the highest back-country shelter on the entire 2,174-mile (3,499 km) trail.
Plumas-Eureka State Park is a California state park located in the Sierra Nevada and Cascade Range in Plumas County, California.
The Bucks Lake Wilderness is a 23,958-acre (97.0 km2) wilderness area located in the Plumas National Forest section of the Sierra Nevada, in northeastern California, United States.
The Marble Mountain Wilderness is a 241,744-acre (978.30 km2) wilderness area located 60 miles (97 km) southwest of Yreka, California, in the United States. It is managed by the United States Forest Service and is within the Klamath National Forest in Siskiyou County. The land was first set aside in April 1931 as the Marble Mountain Primitive Area, which comprised 234,957 acres (950.84 km2). It was one of four areas to gain primitive status under the Forest Service's L-20 regulations that year. In 1964, it became a federally designated wilderness area when the U.S. Congress passed the Wilderness Act.
Little Grass Valley Reservoir is an artificial lake in Plumas County, California and Plumas National Forest near the Pacific Crest Trail.
Hager Mountain is a volcanic peak in Oregon in the northwest corner of the Basin and Range Province in the United States. The mountain is located south of the small unincorporated community of Silver Lake in south-central Oregon, and it is in the Fremont–Winema National Forest. On the summit, there is a fire lookout operated during the summer and fall by the United States Forest Service. There are several hiking trails that lead to the lookout station.
The protected areas of the Sierra Nevada, a major mountain range located in the U.S. states of California and Nevada, are numerous and highly diverse. Like the mountain range itself, these areas span hundreds of miles along the length of the range, and over 14,000 feet of elevation from the lowest foothills to the summit of Mount Whitney.
