Plumas Lake is a master-planned exurb and census-designated place in Yuba County, California. Plumas Lake is located north of the city of Sacramento on the Feather River, just prior to its confluence with the Bear River and the Sacramento River. At full build-out the community is expected to have roughly 12,000 homes and 36,000 residents. The community (which is unincorporated) is located about south of the city of Marysville in southern Yuba County. It lies at an elevation of 46 feet (14 m). The population was 8,126 at the 2020 census. Plumas Lake shares the same ZIP code as Olivehurst, California, a neighboring town. However, Plumas Lake stands as a separate community that is located south of the crossing of McGowan and Arboga and includes the North Arboga Study Area. Many individuals and agencies (including the U.S. Army Corps of Engineers) were opposed to the construction of this project due to the history of severe (15+ feet of standing water) flooding. Notable floods in the area occurred in 1986 and 1997. The flood risk in the area was exacerbated by hydraulic mining which occurred in the Yuba River watershed upstream of the region. Mine tailings wound up in the river beds and were then transported into the Sacramento Valley, where they accumulated in the river channels and reduced their conveyance capacities. This mining activity was part of the Gold Rush of California. A park and ride facility was opened on October 1, 2009 by Caltrans in the Plumas Lake area, along California State Route 70 and Feather River Blvd. Geography According to the United States Census Bureau, the CDP covers an area of 8.4 square miles (21.7 km), all of it land. Demographics The 2010 United States Census reported that Plumas Lake had a population of 5,853. The population density was . The racial makeup of Plumas Lake was 3,923 (67.0%) White, 372 (6.4%) African American, 73 (1.2%) Native American, 474 (8.1%) Asian, 44 (0.8%) Pacific Islander, 451 (7.7%) from other races, and 516 (8.8%) from two or more races. Hispanic or Latino of any race were 1,312 persons (22.4%). The Census reported that 5,853 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized. There were 1,745 households, out of which 1,043 (59.8%) had children under the age of 18 living in them, 1,195 (68.5%) were opposite-sex married couples