Located in Grand River, Iowa, the Twelve Mile Creek Watershed Site D-41a4 is a vital water resource managed by the local government with oversight from the Iowa Department of Natural Resources. Built in 1993 by the USDA NRCS, this earth dam stands at 32 feet tall and spans 425 feet in length, serving multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a storage capacity of 107 acre-feet, this structure covers a surface area of 4 acres and drains an area of 0.49 square miles.

Despite its low hazard potential and moderate risk assessment, the condition of the dam at Twelve Mile Creek Watershed Site D-41a4 is currently not rated. This site has not been inspected recently, and emergency preparedness measures such as an Emergency Action Plan (EAP) are not documented. However, the dam meets state regulations for permitting, inspection, and enforcement, indicating a commitment to ensuring the safety and functionality of the structure. With its location in the Rock Island District and the oversight of the Iowa DNR, this site serves as a valuable asset for water resource management and climate resilience in the region.