Trail Diversion is a private water resource structure located in Elmore, Idaho, along Little Canyon Creek and the Snake River. Constructed in 1962, this earth dam stands at a height of 27.6 feet, with a hydraulic height of 20.9 feet. It serves as a vital resource for water storage, with a capacity of 63 acre-feet and a drainage area of 29 square miles.

With a controlled spillway width of 36 feet and a maximum discharge of 1200 cubic feet per second, Trail Diversion plays a crucial role in managing water flow and mitigating flood risks in the region. Despite its fair condition assessment in 2017, the structure has a low hazard potential and is inspected every four years to ensure its continued safety and functionality. The risk assessment categorizes Trail Diversion as having a very high risk level, highlighting the importance of ongoing monitoring and maintenance to safeguard the surrounding communities and ecosystems from potential water-related hazards.