Also at Folsom Lake State Recreation Area is California Historical Landmark #570, Negro Hill. Negro Hill, California, also called, Negro Flat, was a former historic mining town also under Folsom Lake, 38°41′53″N121°06′33″W / 38.698°N 121.1093°W / 38.698; -121.1093. African-American miners worked the area from 1849 to 1852. At its peak in 1855, the town had a population of 400, of all races. The town had a boarding house and a church, but with the gold gone, the town was gone by 1870.[2][3][4]