From California Historical Landmarks:
This was the headquarters for the largest network of water flumes and ditches in the state. The South Yuba Canal Water Company was the first incorporated to supply water for hydraulic mining. The original ditch was in use in May 1850, and this company office was in use from 1857 to 1880. The company's holdings later became part of the vast PG&E hydroelectric system.
Location and Vicinity Map