James Thompson No. 1 Stock, located in Edgemont, South Dakota, is a privately owned earth dam completed in 1960 with a primary purpose of fire protection, stock, or small fish pond. The dam stands at a height of 30 feet with a hydraulic height of 25 feet and a structural height of 30 feet. It has a length of 627 feet and a storage capacity of 109 acre-feet, providing essential water resources for the surrounding area.

Despite its low hazard potential, James Thompson No. 1 Stock is currently in poor condition, as assessed in April 2017. The dam has an uncontrolled spillway and one outlet gate, with a drainage area of zero. While the risk assessment indicates a moderate risk level, there is a need for further inspection and maintenance to ensure the safety and stability of the structure. As climate change continues to impact water resources, the importance of proper management and upkeep of dams like James Thompson No. 1 Stock becomes increasingly crucial.

In the Congressional District 00 of Wyoming, represented by Liz Cheney (R), this dam plays a vital role in providing water for fire protection and stock, as well as serving as a small fish pond. As water resource and climate enthusiasts, it is essential to monitor and address the maintenance needs of structures like James Thompson No. 1 Stock to ensure the sustainability of water management practices in the face of changing environmental conditions.