Heil No 1, also known as Heil Dam Upper, is a privately owned structure located in Twin Falls, Idaho. Completed in 1974, this earth dam serves primarily for irrigation purposes along the Worley Draw and Devil Creek. Standing at a height of 24.2 feet with a storage capacity of 480 acre-feet, Heil No 1 covers a surface area of 58 acres and has a drainage area of 3.5 square miles.

Managed by the Idaho Department of Water Resources, Heil No 1 is regulated, permitted, inspected, and enforced by the state agency to ensure its structural integrity and compliance with safety protocols. Despite being classified as a low hazard potential dam with fair condition assessment, there is a moderate risk associated with its operation, signifying the importance of ongoing risk management measures. With a spillway type of uncontrolled and a maximum discharge capacity of 52 cubic feet per second, Heil No 1 plays a crucial role in water resource management in the region.

Overall, Heil No 1 serves as a vital infrastructure for irrigation in the area, highlighting the intersection of water resource management and climate adaptation efforts. As enthusiasts in these fields continue to monitor and assess the condition of dams like Heil No 1, ensuring their resilience in the face of changing environmental conditions remains a key priority for sustainable water management practices.