Preston Forebay is a historic hydroelectric facility located in Ione, California, owned by a public utility. Built in 1892, this offstream dam stands at a height of 40 feet and has a storage capacity of 30 acre-feet. The primary purposes of the dam include flood risk reduction, hydroelectric power generation, and irrigation, making it a vital water resource for the region.

Managed by the California Department of Water Resources (DWR), Preston Forebay is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. With a low hazard potential and a satisfactory condition assessment, the dam provides reliable water storage and power generation while maintaining minimal risk to surrounding communities. The dam's historical significance, combined with its modern regulatory oversight, makes it a valuable asset in managing water resources and climate challenges in Amador County.

As part of the San Francisco District, Preston Forebay plays a crucial role in the local water infrastructure, contributing to the overall resilience of the region. With a strong emphasis on safety and regulatory compliance, this dam serves as a testament to the intersection of traditional hydroelectric technology and modern water management practices. For water resource and climate enthusiasts, Preston Forebay offers a fascinating glimpse into the history and evolution of water infrastructure in California.