Located in Lemhi County, Idaho, Billy Creek is a privately owned irrigation structure that has been regulating water flow since it was completed in 1916. With a height of 15.6 feet and a hydraulic height of 12.7 feet, this earth dam on the Salmon River watershed serves a vital role in supplying water for agricultural purposes in the region. The dam has a storage capacity of 75 acre-feet and covers a drainage area of 0.5 square miles.

Despite its historical significance, Billy Creek has a poor condition assessment as of the last inspection in 2016. The dam is classified as low hazard potential, but its risk assessment indicates a moderate level of risk. In terms of regulatory oversight, the Idaho Department of Water Resources is responsible for permitting, inspecting, and enforcing regulations related to the operation of Billy Creek. The structure also falls under state jurisdiction and is subject to state regulatory agencies.

As a key component of the irrigation infrastructure in the area, Billy Creek plays a crucial role in water resource management and agricultural production. Climate and water resource enthusiasts interested in understanding the impact of aging infrastructure on water availability and the environment may find the case of Billy Creek to be an intriguing example of the challenges facing dams in the western United States. The need for ongoing maintenance and improvements to ensure the safety and effectiveness of structures like Billy Creek highlights the complex relationship between water resources, climate variability, and infrastructure resilience.