Soap Creek Watershed Site 4-73, located in Appanoose County, Iowa, is a flood risk reduction structure designed by the USDA NRCS and completed in 2005. This earth dam stands at 27 feet tall and stretches 800 feet in length, with a storage capacity of 83 acre-feet. Situated on the TR- North Soap Creek, this dam serves the primary purpose of flood risk reduction and grade stabilization in the region.

Owned and regulated by the local government, specifically the Iowa Department of Natural Resources, Soap Creek Watershed Site 4-73 has a low hazard potential and a moderate risk assessment rating. With a drainage area of 0.31 square miles and a surface area of 5.1 acres, this structure plays a crucial role in managing water resources in the area. Despite not currently being rated for condition assessment, this dam continues to provide essential flood protection for the surrounding community of SELMA.

With its uncontrolled spillway type and stone core construction, Soap Creek Watershed Site 4-73 is a vital piece of infrastructure in the region's water resource management system. Although not currently inspected or assessed for condition, this dam stands as a testament to the collaborative efforts between federal and local agencies in mitigating flood risks and ensuring the safety of residents in Appanoose County, Iowa.