Big Sand Wash East is a privately owned irrigation dam located in Upalco, Utah. Constructed in 2006, this earth dam stands at a hydraulic height of 44 feet and a structural height of 52 feet, with a length of 3000 feet. The dam has a storage capacity of 16,900 acre-feet and primarily serves the purpose of irrigation for the surrounding area.

Managed by the Utah Division of Water Rights, Big Sand Wash East is regulated, inspected, and enforced by the state to ensure its safety and functionality. With a high hazard potential but a satisfactory condition assessment, the dam has been deemed safe for operation. The last inspection in September 2020 confirmed its structural integrity, and emergency action plans are in place to mitigate any potential risks.

Situated in Duchesne County, Utah, along the Big Sand Wash river, this dam plays a crucial role in water resource management in the region. With its significant storage capacity and vital irrigation function, Big Sand Wash East remains an essential infrastructure for maintaining water security in the area while mitigating potential risks associated with high hazard potential.