Soap Creek Watershed Site 4-91 in Iowa, managed by the USDA NRCS, is a flood risk reduction structure located in Appanoose County. Completed in 2005, this earth dam stands at a height of 27 feet and spans 420 feet in length, with a maximum storage capacity of 37 acre-feet. While primarily serving the purpose of flood risk reduction, it also aids in grade stabilization along TR-Boyd Branch, contributing to the overall water management efforts in the region.

Despite being categorized as having a low hazard potential and a moderate risk assessment, Soap Creek Watershed Site 4-91 has not been rated for its condition assessment. This structure operates with an uncontrolled spillway type and is not currently regulated or inspected by state agencies. With a drainage area of 0.14 square miles and a surface area of 2 acres, this site plays a crucial role in mitigating potential flooding impacts in the surrounding Selma community and beyond. As a valuable asset within the Rock Island District, it showcases the ongoing collaboration between local government and federal agencies in safeguarding water resources and enhancing climate resilience.

Soap Creek Watershed Site 4-91 serves as a testament to the collaborative efforts between the USDA NRCS and local government in addressing flood risk reduction and grade stabilization in the region. With its strategic location along TR-Boyd Branch in Appanoose County, Iowa, this earth dam provides essential water management functions while maintaining a low hazard potential. As climate change continues to pose challenges to water resources, structures like these play a vital role in enhancing community resilience and safeguarding against potential flood events.