Three Mile Creek Watershed Site 52-1, located in Union, Iowa, is a notable earth dam constructed in 1976 by the USDA NRCS for fire protection, stock, and small fish pond purposes. This dam, with a height of 35 feet and a length of 640 feet, serves as a vital structure for flood risk reduction in the area. Situated on TR-Three Mile Creek, this site is regulated by the Iowa DNR and falls under state jurisdiction for permitting, inspection, and enforcement, ensuring its compliance with state regulations.

With a storage capacity of 160 acre-feet and a drainage area of 0.39 square miles, Three Mile Creek Watershed Site 52-1 provides critical water resource management in the region. The dam's spillway is uncontrolled, and its hazard potential is rated as low, with a moderate risk assessment score of 3. While the condition assessment is currently not rated, the dam's risk management measures are not specified. Despite being non-federally owned, this site represents a valuable asset for the local government of Talmage, Iowa, and highlights the collaborative efforts between various agencies like the NRCS and the Iowa DNR in safeguarding water resources and enhancing climate resilience in the area.