Hayes is a state-regulated dam located in South Dakota, specifically in Stanley County, along Frozen Man Creek. Built in 1937 by the Works Progress Administration (WPA), this Earth-type dam stands at 17 feet high and spans 670 feet in length, with a storage capacity of 845 acre-feet. The dam's primary purpose and associated structures are not specified, but it is noted to have a low hazard potential and a moderate risk assessment rating.

Despite being state-regulated by the South Dakota Department of Agriculture and Natural Resources (DANR), Hayes has not been rated for its condition assessment and lacks Emergency Action Plan (EAP) preparedness. The dam's inspection frequency is set at three years, with the last recorded inspection conducted in October 2017. Dusty Johnson, a Republican, represents the area in Congress, although specific congressional district information is not provided. With an uncontrolled spillway and no outlet gates, Hayes poses a moderate risk that requires proper risk management measures and potential updates to its emergency preparedness protocols. Water resource and climate enthusiasts may find Hayes to be an intriguing case study for understanding the regulatory oversight and risk factors associated with dam infrastructure in the region.