Mayfield Irrigation Regulating Reservoir, located in Sanpete, Utah, is a privately owned water resource managed by the Utah Division of Water Rights. Completed in 1984, this Earth dam stands 30 feet tall with a hydraulic height of 27 feet. It has a storage capacity of 85 acre-feet, with a normal storage level of 69 acre-feet. The reservoir serves multiple purposes and is crucial for regulating water flow in the area.

With a significant hazard potential, Mayfield Reservoir has a regular inspection frequency to ensure its structural integrity. The last inspection took place in August 2019, and the dam's condition remains unrated. While an Emergency Action Plan has not been prepared, the reservoir meets state regulatory standards for permitting, inspection, and enforcement. This regulating reservoir plays a vital role in managing water resources in the region, highlighting the importance of sustainable water management practices in the face of changing climate patterns.