Soap Creek Watershed Site 90-74 is a flood risk reduction structure located in Selma, Iowa, within the Tr-Brush Creek watershed. Constructed in 2006 by the USDA NRCS, this earth dam stands at a height of 31 feet and spans 625 feet in length, providing a storage capacity of 83 acre-feet. With a low hazard potential and a moderate risk assessment rating, this dam plays a crucial role in mitigating the risk of floods in the area.

Managed by the local government and regulated by the Iowa DNR, Soap Creek Watershed Site 90-74 is designed to handle a maximum discharge of 108 cubic feet per second through an uncontrolled spillway. The dam serves the primary purpose of flood risk reduction, with a normal storage capacity of 23 acre-feet and a drainage area of 0.33 square miles. Despite not being condition rated, this structure aligns with state permitting and inspection requirements, ensuring its effectiveness in protecting the surrounding community from potential flood events.

With a strategic location in Wapello County, Iowa, Soap Creek Watershed Site 90-74 provides critical flood protection for the residents of Selma. As a key component of the local water resource management system, this dam exemplifies the collaborative efforts between federal and state agencies to safeguard communities against the impacts of climate change. Its design, construction, and operational standards reflect a commitment to resilience and sustainability in the face of changing environmental conditions.