Smith Tank, located in Thatcher, Arizona, is a private-owned water structure regulated by the Arizona Department of Water Resources. This Earth-type dam serves multiple purposes, including fire protection, stock, fish and wildlife pond, and irrigation, with a primary focus on enhancing fish and wildlife habitats. The tank has a storage capacity of 72.4 acre-feet and covers a surface area of 7.3 acres, making it a vital resource for the surrounding area.

With a low hazard potential and a moderate risk assessment rating, Smith Tank plays a crucial role in water management and conservation efforts in Graham County. The dam's uncontrolled spillway, with a width of 12 feet, ensures safe overflow during periods of high water levels. Although the last inspection was conducted in 2013, with a frequency of every 5 years, the structure remains in good condition, albeit not officially rated.

Overall, Smith Tank stands as a testament to sustainable water resource management, providing essential support for wildlife habitats and agricultural activities in the region. Its strategic location along Ash Creek and its modest yet effective design make it a valuable asset for the community, showcasing the importance of private initiatives in maintaining water security and environmental stewardship.