Located in Auburn, California, the Ralston Afterbay is a concrete dam structure built in 1966 primarily for irrigation purposes. However, this reservoir serves multiple functions including hydroelectric power generation, recreation, and water supply. With a height of 89 feet and a storage capacity of 2,780 acre-feet, the Ralston Afterbay plays a crucial role in water management in the region.

Managed by the local government and regulated by the Federal Energy Regulatory Commission, the Ralston Afterbay is subject to regular inspections to ensure its structural integrity and safety. With a controlled spillway width of 200 feet and a maximum discharge of 159,000 cubic feet per second, the dam has a high hazard potential and is categorized as a very high-risk structure. Despite its age, the dam continues to play a vital role in supporting agriculture and water resources in the area.

The Ralston Afterbay's location on the Rubicon River provides a picturesque setting for outdoor recreational activities while also serving as a critical water storage facility for the surrounding communities. As water resource and climate enthusiasts, understanding the infrastructure and management of dams like the Ralston Afterbay is essential for ensuring sustainable water usage and environmental conservation in the face of changing climate patterns.