Lower Lake, California Lower Lake, California Lower Lake (formerly Grantville) is a census-designated place (CDP) in the southern Clear Lake region of Lake County, in northern California. Lower Lake is also an Indian rancheria of the Koi Nation people. Lower Lake is located 4.5 miles (7.2 km) southwest of the City of Clearlake, and southeast of Kelseyville. It is at an elevation of 1371 feet (418 m). Lower Lake was at one point the county seat, the Lake County elections of 1867 were hotly contested with the seat moving between what is now the city of Lakeport and the town of Lower Lake,
Lower Lake, California in 1870 the feud was settled and Lakeport controlled the seat. Although some believe the seat was stolen from Lower Lake, it has remained in Lakeport for over a century and no longer a topic of concern for locals. At the 2000 census, according to the United States Census Bureau, the CDP had a total area of , of which was land and (0.88%) was water. Lower Lake was founded by E. Mitchell in 1858 as Grantville. He built the first house there. The settlement's first post office was opened in 1858. The population was 1,294 at the 2010 census,