Located in Fremont, Wyoming, the Hays dam serves as a crucial infrastructure for irrigation purposes in the region. Built in 1918, this earth dam stands at a height of 20 feet and has a storage capacity of 557 acre-feet, with a normal storage of 418 acre-feet. The dam's primary source agency is in Wyoming, and it is regulated and inspected by the State of Wyoming.

Despite its historical significance, the Hays dam is in poor condition according to a 2019 assessment, and its hazard potential is rated as low. The spillway type is uncontrolled with a width of 12 feet, and there is one outlet gate in place. Although the risk assessment for this dam is moderate, there are no specific risk management measures mentioned in the data. It is crucial for water resource and climate enthusiasts to monitor the maintenance and upkeep of the Hays dam to ensure its continued functionality and safety for irrigation purposes in the region.