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,
US 31–Island Lake Outlet Bridge part of the National Highway System. Island Lake Outlet, also known as the Pine River Channel, was dredged in 1870 to connect Lake Michigan to Lake Charlevoix through Round Lake. A total of five bridges have crossed the channel at this location; the first was a small footbridge built in 1869. The current bridge replaced a swing truss bridge built by the city of Charlevoix in 1901. The US 31–Island Lake Outlet Bridge was designed by the bridge division of the Michigan State Highway Department, led by George M. Foster, and by consulting engineers Haslett and Erdal. Plans were prepared