Soap Creek Watershed Site 4-57b, located in Appanoose County, Iowa, is a key structure designed by the USDA NRCS for flood risk reduction along the TR- North Soap Creek. Completed in 1992, this earth dam stands at a height of 29 feet and spans 406 feet, with a storage capacity of 65 acre-feet. The primary purpose of this dam is flood risk reduction, but it also serves fire protection and provides a source for small fish ponds or livestock.

With a low hazard potential, Soap Creek Watershed Site 4-57b has not been rated for condition assessment, but its risk level is moderate. The dam has not been modified since its completion and lacks certain emergency preparedness measures, such as an Emergency Action Plan (EAP). Despite these shortcomings, the dam's structural integrity and functionality are maintained by the Iowa DNR, which regulates, inspects, and enforces state laws to ensure public safety and environmental protection in the region. For water resource and climate enthusiasts, this site offers a unique opportunity to study the intersection of infrastructure, environmental stewardship, and community resilience in managing water resources in Iowa's diverse landscape.