Green Dam is a privately owned earth dam located in Mingo, Polk County, Iowa, along TR-Indian Creek. Built in 1961 by the USDA NRCS, this dam serves multiple purposes including fire protection and as a stock or small fish pond. It stands at 30 feet high, with a length of 371 feet and a storage capacity of 49 acre-feet. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections and enforcement to ensure its safety and functionality.

Despite its low hazard potential, Green Dam has a moderate risk assessment rating of 3, indicating some potential risks that need to be managed. While the dam's condition has not been formally rated, it has not undergone any major modifications since its completion. Emergency action plans and inundation maps have not been prepared for the dam, highlighting the need for further risk management measures to be put in place. Given its importance for fire protection and water storage, Green Dam serves as a crucial infrastructure in the region's water resource management and climate resilience efforts.