Cape Horn, also known as Van Arsdale, is a privately owned hydroelectric dam located in Mendocino, California, along the Eel River. Completed in 1907, this earth dam stands at a height of 60 feet and has a structural height of 63 feet, with a storage capacity of 390 acre-feet. With a maximum discharge of 115,000 cubic feet per second, Cape Horn plays a crucial role in regulating water flow and generating hydroelectric power in the region.

Managed by the Federal Energy Regulatory Commission, Cape Horn is classified as a high hazard potential dam with a moderate risk assessment rating. Despite its age, the dam is regularly inspected and maintained to ensure its structural integrity and safety. The surrounding area has a normal storage capacity of 102 acre-feet and covers a surface area of 65 acres, serving as a key resource for water supply and management in the region.

With its strategic location and significant contribution to hydroelectric power generation, Cape Horn stands as a vital infrastructure for water resource and climate enthusiasts. Its role in regulating water flow, providing storage capacity, and generating renewable energy showcases the importance of sustainable water management practices in the face of changing climate conditions.