Located in Afton, Iowa, the Hatfield Dam is a private-owned structure designed by Don Tresemer and completed in 1999. This Earth-type dam stands at a height of 27 feet and stretches 570 feet in length, with a storage capacity of 221 acre-feet. The primary purpose of the dam is for fire protection and to serve as a stock or small fish pond, making it a valuable resource for the local community.

Situated on Twelvemile Creek, the Hatfield Dam is regulated by the Iowa Department of Natural Resources and is subject to state inspection and enforcement. With a low hazard potential and a moderate risk assessment, this dam plays a crucial role in managing water resources in the area. Despite not being rated for its condition assessment, the Hatfield Dam continues to provide essential services while meeting state permitting requirements.

Water resource and climate enthusiasts can appreciate the Hatfield Dam for its contribution to the local ecosystem and its role in mitigating potential risks. With its uncontrolled spillway and moderate risk level, this structure showcases the importance of sustainable water management practices. As a private-owned facility in Iowa, the Hatfield Dam stands as a testament to the collaboration between private entities and state regulatory agencies in ensuring the safety and efficiency of water infrastructure.