Big Sand Wash West is a privately owned irrigation dam located in Upalco, Duchesne County, Utah. Completed in 2006, this earth dam stands at a structural height of 55 feet and serves the primary purpose of providing water for irrigation. With a maximum storage capacity of 19,600 acre-feet and a normal storage of 18,800 acre-feet, the dam plays a crucial role in water resource management in the region.

Managed by the Utah Division of Water Rights, Big Sand Wash West has a high hazard potential but is currently rated as being in satisfactory condition. The dam spans 2,950 feet in length and is situated on the Big Sand Wash River, covering a drainage area of 26.64 square miles. Despite its remote location, the dam is subject to regular state inspections and enforcement to ensure its structural integrity and the safety of downstream communities.

With its significant storage capacity and vital role in supporting agricultural activities in the area, Big Sand Wash West serves as a critical water resource infrastructure in Utah. As a regulated and inspected dam, it highlights the importance of ongoing monitoring and maintenance to safeguard against potential risks and ensure the sustainable use of water resources in the region.