Diamond Valley Lake Forebay, located in Winchester, California, is a vital water resource facility primarily serving as a hydroelectric power source and water supply system. Completed in 1999, this earth dam structure stands at a height of 22 feet and has a storage capacity of 500 acre-feet. Managed by the California Department of Water Resources, the forebay is regulated, inspected, and enforced by state authorities to ensure its safety and functionality.

With a low hazard potential and a satisfactory condition assessment, Diamond Valley Lake Forebay plays a crucial role in the water management infrastructure of Riverside County. The facility covers a surface area of 31 acres and has a drainage area of 0.13 square miles, making it a significant contributor to the region's water supply and hydroelectric power generation. The forebay's location along the Domenigoni Val Canal adds to its strategic importance in the local water network.

Overall, Diamond Valley Lake Forebay stands as a key component in the water resource landscape of California, providing essential services for both energy production and water distribution. With regular inspections and a solid emergency action plan, the forebay exemplifies a commitment to safety and efficiency in managing water resources in the region. Its presence underscores the importance of sustainable water infrastructure in addressing the challenges of climate change and population growth.