Tom J is a privately-owned dam located in Payette River, Idaho, with a primary purpose of irrigation. This earth dam, constructed in 1995, stands at a height of 56.7 feet and has a hydraulic height of 52 feet. With a storage capacity of 2960 acre-feet and a drainage area of 7.2 square miles, Tom J plays a crucial role in water resource management in the region.

The dam's spillway type is uncontrolled, with a width of 28 feet, and it features slide (sluice gate) outlet gates. Although the dam is rated as having a "fair" condition assessment, it poses a significant hazard potential. The last inspection in May 2017 noted that the dam's emergency action plan (EAP) was last revised in 1994, and there are no inundation maps prepared. Despite these challenges, the risk assessment for Tom J is moderate (3), indicating the need for ongoing risk management measures to ensure the safety and effectiveness of the dam.

For water resource and climate enthusiasts, Tom J offers a fascinating case study in dam engineering and management. With its location on Beaver Creek North Fork Payette River and its role in irrigation, this dam is a vital piece of infrastructure in Valley County, Idaho. Understanding the complexity of maintaining and monitoring dams like Tom J is essential for ensuring the sustainable use of water resources and mitigating the potential risks associated with dam failure.