Hay Creek Wallace Dam, located in Sioux County, Nebraska, is a privately owned earth dam primarily used for irrigation purposes. Constructed in 1950 by the USDA NRCS, this dam stands at a height of 26 feet with a structural height of 30 feet, providing a storage capacity of 184 acre-feet. The dam is situated on Hay Creek, covering a drainage area of 10.6 square miles and serving as a crucial water resource for the surrounding agricultural lands.

Despite its importance for irrigation, Hay Creek Wallace Dam has been rated as having a poor condition assessment, with a low hazard potential. The dam has a history of state regulation, inspection, and enforcement by the Nebraska Department of Natural Resources, ensuring its safety and compliance with regulatory standards. The last inspection in 2019 highlighted the need for improvements to its condition and emergency action plan, emphasizing the importance of ongoing maintenance and risk management measures to safeguard the surrounding community and water resources.

As a key infrastructure in the region, Hay Creek Wallace Dam plays a vital role in water management and agricultural sustainability. With its proximity to the Ardmore SD area and the Omaha District, the dam's capacity for irrigation and flood control is essential for supporting the local economy and ecosystem. As water resource and climate enthusiasts, it is important to monitor the dam's maintenance and regulatory compliance to ensure its continued effectiveness in water management and environmental protection.