Trail, also known as Blair Trail, is a private water resource structure located in Idaho, specifically in Elmore County. This trail serves primarily for irrigation purposes and is regulated by the Idaho Department of Water Resources. Completed in 1960, this earth dam stands at a height of 30.4 feet, with a hydraulic height of 27 feet, and a length of 5085 feet.

With a storage capacity of 2532 acre-feet and a surface area of 190 acres, Trail plays a crucial role in managing water resources in the region. The dam is equipped with a controlled spillway and slide gates for water discharge. Despite being assessed as in fair condition, it poses a significant hazard potential due to its very high risk assessment rating.

Trail serves as a vital infrastructure for water management and irrigation in the area, contributing to the sustainability of the local agriculture and ecosystems. Its presence highlights the importance of maintaining and monitoring water resource structures to ensure the safety and efficiency of water management practices in the region.