Halsey Forebay No. 1, located in Auburn, California, is a privately owned hydroelectric dam completed in 1913. This earth dam stands at a height of 42 feet and has a maximum storage capacity of 244 acre-feet. The dam serves the primary purpose of generating hydroelectric power and is regulated by the State of California's Department of Water Resources (DWR) for safety compliance.

Managed by the Federal Energy Regulatory Commission (FERC), Halsey Forebay No. 1 has a spillway width of 40 feet and a maximum discharge capacity of 1200 cubic feet per second. With a hazard potential rated as high and a moderate risk assessment score of 3, the dam is inspected regularly to ensure its structural integrity and emergency preparedness. The surrounding area has a surface area of 18 acres and is situated along Dry Creek, making it a vital water resource in Placer County.

Despite its age, Halsey Forebay No. 1 continues to play a crucial role in the region's water management and renewable energy production. With its rich history and ongoing regulatory oversight, this dam stands as a testament to the importance of sustainable water resource development in the face of changing climate conditions.