California's ghost towns trace a run of booms. Gold found at Sutter's Mill in Coloma in January 1848 brought about 300,000 people to California by 1855, and the camps they built line the Sierra Nevada foothills along Highway 49, the Golden Chain Highway. Later strikes moved east of the Sierra and into the Mojave: silver at Cerro Gordo in 1865, a gold boom at Bodie in the late 1870s, silver at Calico in 1881 and gold at Randsburg in 1895. The state also has coal towns below Mount Diablo, railroad water stops that became Route 66 towns, a socialist colony at Llano del Rio and Leadfield, a 1920s stock-promotion camp in Death Valley. Other towns were drowned by reservoirs or bypassed by new rail lines and highways.
The sites cluster in two belts: the Gold Country foothills, and the deserts east of the Sierra, where Inyo County, which takes in Death Valley and the Owens Valley, has more sites in our index than any other county. What survives varies a lot. Bodie keeps about 110 buildings in arrested decay as a state historic park, and Columbia and North Bloomfield are state parks too. Calico was largely rebuilt in the 1950s. Many Gold Rush camps grew into small living towns, while many desert camps are down to foundations, mine dumps and a cemetery.