Separately issued unfolded map of Sierra County, published by C.F. Weber.
The map shows early railroads, roads, wagon roads, mines, lakes, mills, and many other details.
Sierra County was formed from parts of Yuba County in 1852. The county derives its name from the Sierra Nevada.
After the discovery of gold in the Sierra foothills sparked the California Gold Rush, more than 16,000 miners settled in Sierra County between 1848-1860. Most mining settlements in the county sprung up along the North and Middle Forks of the Yuba River, both of which had rich deposits of gold. While some of the mining boom towns faded away once gold fever died down, other settlements such as Downieville and Sierra City have remained.