Long Tom is a private irrigation dam located in the picturesque Long Tom Creek and Canyon Creek in Mountain Home, Idaho. Built in 1906, this earth dam stands at a height of 60.3 feet and has a storage capacity of 3600 acre-feet, serving as a vital water resource for the surrounding area. The dam covers a surface area of 158 acres and has a drainage area of 27 square miles, with a maximum discharge capacity of 450 cubic feet per second.

Despite being regulated by the Idaho Department of Water Resources, Long Tom poses a significant hazard potential with a fair condition assessment as of May 2018. The dam features an uncontrolled spillway and slide gates for outlet controls, and is inspected every 4 years to ensure its structural integrity. The risk assessment for Long Tom is moderate, highlighting the importance of ongoing risk management measures to safeguard against potential emergencies. For water resource and climate enthusiasts, Long Tom represents a historic and essential piece of Idaho's irrigation infrastructure that requires careful monitoring and maintenance to ensure its continued functionality and safety.