Williamson Dam, located in Appanoose County, Iowa, is a privately owned structure designed by USDA NRCS and completed in 1987. This earth dam serves multiple purposes including fire protection, stock ponds, and small fish habitats, with a storage capacity of 60 acre-feet and a surface area of 3.4 acres. The dam is regulated by the Iowa DNR and is subject to state permitting, inspection, and enforcement.

With a height of 27 feet and a length of 430 feet, Williamson Dam poses a low hazard potential and is classified as having a moderate risk level. The dam has an uncontrolled spillway type and is situated on TR- Cooper Creek, within the Rock Island District. The surrounding area benefits from the dam's water resource management capabilities, providing essential services for local fire protection and wildlife conservation.

Despite its low hazard potential, Williamson Dam's risk assessment indicates the need for ongoing risk management measures. While its condition is currently not rated, the dam's regulatory oversight and compliance with state regulations ensure the safety and integrity of the structure for the community of Centerville and beyond. Water resource and climate enthusiasts can appreciate the vital role that Williamson Dam plays in sustaining the local ecosystem and providing necessary resources for various purposes.