Copco No 1 is a privately-owned hydroelectric dam located on the Klamath River in Siskiyou County, California. Completed in 1922, this gravity dam stands at a height of 230 feet and has a structural height of 250 feet. With a storage capacity of 60,000 acre-feet and a surface area of 1,000 acres, Copco No 1 plays a crucial role in water resource management and hydroelectric power generation in the region.

The dam is regulated by the State of California and is subject to regular inspections by the Department of Water Resources and the Safety of Dams agency. It has a high hazard potential and a very high risk assessment rating, indicating the importance of proper maintenance and emergency preparedness. Copco No 1 also serves multiple purposes, including fish and wildlife habitat, recreation, and hydroelectric power generation, making it a vital asset for both the environment and the local community.

With its impressive infrastructure and significant impact on water resources and climate, Copco No 1 stands as a key player in the sustainable management of the Klamath River watershed. Its controlled spillway, Tainter and Vertical Lift outlet gates, and rock foundation highlight the engineering ingenuity behind this historic dam. As water resource and climate enthusiasts, understanding the complexities and importance of structures like Copco No 1 is essential for ensuring the long-term resilience and sustainability of our water systems.