Buck Island Main, located in El Dorado County, California, is a key infrastructure in the state's water resource management system. Owned by a public utility and regulated by the Department of Water Resources and Safety of Dams, this concrete gravity dam stands at a height of 22 feet and was completed in 1963. With a primary purpose of hydroelectric power generation, Buck Island Main also serves recreational purposes, offering a surface area of 78 acres for visitors to enjoy.

Managed by the Federal Energy Regulatory Commission, Buck Island Main has a storage capacity of 1,070 acre-feet and a maximum discharge of 15,000 cubic feet per second. The dam's spillway, at 130 feet wide, is uncontrolled, with a low hazard potential. Despite its moderate risk assessment score, the dam's condition assessment is currently not available, and its last inspection took place in August 2019. Emergency action plans have been prepared and revised periodically to ensure the safety and security of the surrounding area in case of any unforeseen events.

Located near Folsom and Rockbound Creek, Buck Island Main plays a vital role in water resource management and hydroelectric power generation in California. With its impressive engineering design by Bechtel, the dam continues to be a crucial asset in the state's efforts to harness renewable energy sources and provide recreational opportunities for the local community.