Hadler Detention, located in Mazeppa, Minnesota, is a private earth dam designed by NRCS in 1981 for flood risk reduction along Trout Brook. The dam stands at 30 feet tall with a length of 210 feet, providing a storage capacity of 35.6 acre-feet to manage runoff in the area. The dam is state-regulated and undergoes regular inspections, with a low hazard potential and satisfactory condition assessment as of the last inspection in 2016.

Owned privately, Hadler Detention serves as a critical infrastructure in Goodhue County for mitigating flood risks and protecting surrounding areas from potential inundation. Its primary purpose aligns with flood risk reduction efforts, with a moderate risk assessment rating. The dam's location, design, and operational functions are integral to water resource management in the region, reflecting a commitment to climate resilience and hazard mitigation in a changing environment. As part of the broader network of water infrastructure in Minnesota, Hadler Detention plays a vital role in maintaining the safety and sustainability of the local watershed.