Alpine County is a county in the eastern part of the U.S. state of California located within the Sierra Nevada on the state border with Nevada. As of the 2020 census, the population was 1,204, making it California's least populous county. The county seat is Markleeville and the largest community is Alpine Village.
The West Fork Carson River is a major tributary of the Carson River, about 35 miles (56 km) long, in Alpine County, California, and Douglas County, Nevada, in the United States.
It rises in the Sierra Nevada of California, at Lost Lakes near Carson Pass in the Mokelumne Wilderness of Humboldt-Toiyabe National Forest. It flows north into Hope Valley where it is joined by SR 88 (Carson Pass Highway), which closely follows the river as it travels toward Nevada. At the northern end of the valley it turns east, flowing through a gorge, before emerging from the mountains near Woodfords. From there it flows north, into the Carson Valley of Nevada, where it joins with the East Fork Carson River at Genoa to form the Carson River.
Carson Pass is a mountain pass on the crest of the central Sierra Nevada, in the Eldorado National Forest and Alpine County, eastern California.
The pass is traversed by California State Route 88. It lies on the Great Basin Divide, with the West Fork Carson River on the east and the South Fork American River on the west.
Inyo County (/ˈɪnjoʊ/ ) is a county in the eastern central part of the U.S. state of California, located between the Sierra Nevada and the state of Nevada. In the 2020 census, the population was 19,016. The county seat is Independence. Inyo County is on the east side of the Sierra Nevada and southeast of Yosemite National Park in Central California. It contains the Owens River Valley; it is flanked to the west by the Sierra Nevada and to the east by the White Mountains and the Inyo Mountains. Mono County is to the north. With an area of 10,192 square miles (26,400 km), Inyo is the second-largest county by area in California, after San Bernardino County which is directly south of Inyo County. Almost half of Inyo County's area is within Death Valley National Park. However, with a population density of 1.8 people per square mile, it also has the second-lowest population density in California, after Alpine County.
Mariposa County (/ˌmærɪˈpoʊzə, -sə/ ) is a county located in the U.S. state of California. As of the 2020 U.S. census, the population was 17,131. The county seat is Mariposa. It is located in the western foothills of the Sierra Nevada mountains, north of Fresno, east of Merced, and southeast of Stockton. The eastern part of the county is the principal area of Yosemite National Park.
Mariposa County is one of only three counties in California that does not include any incorporated cities (with Alpine and Trinity counties being the other two). The county does include, however, 17 communities that are recognized as census-designated places for statistical purposes. It also has the distinction of not having any permanent traffic signals anywhere in the county.
Aromas (Spanish for "Scents") is an unincorporated community and census-designated place (CDP) in Monterey County and San Benito County, California, United States. The population was 2,708 at the 2020 census.
The CDP straddles the border of the two counties, with Monterey County to the west and San Benito County to the east. The Santa Cruz County line is less than a mile to the northwest, and Santa Clara County is about 2 miles (3 km) to the north. Its population was almost equally distributed between the two counties with 1,365 in Monterey County and 1,343 in San Benito County. Aromas is one of four CDPs in California that are divided between two or more counties. The others are Kingvale (divided between Placer County and Nevada County), Kirkwood (divided between Alpine County and Amador County), and Tahoma (divided between Placer County and El Dorado County).
The Carson River is a northwestern Nevada river that empties into the Carson Sink, an endorheic basin. The main stem of the river is 131 miles (211 km) long although the addition of the East Fork makes the total length 205 miles (330 km), traversing five counties: Alpine County in California and Douglas, Storey, Lyon, and Churchill Counties in Nevada, as well as the Consolidated Municipality of Carson City, Nevada. The river is named for Kit Carson, who guided John C. Frémont's expedition westward up the Carson Valley and across Carson Pass in winter, 1844. The river made the National Priorities List (NPL) on October 30, 1990 as the Carson River Mercury Superfund site (CRMS) due to investigations that showed trace amounts of mercury in the wildlife and watershed sediments.
Trinity County is a county located in the northwestern portion of the U.S. state of California. Trinity County is rugged, mountainous, heavily forested, and lies along the Trinity River (for which it is named) within the Salmon, Klamath Mountains, as well as a portion of the Scott, Trinity, and North Yolla Bolly Mountains. It is also one of three counties in California with no incorporated cities (the other two counties in California with that distinction are Alpine and Mariposa counties).
As of the 2020 census, the population was 16,112, making it the fifth least-populous county in California, and the least-populous of California's 27 original counties. The county seat and largest community is Weaverville.