South Magnolia Watershed Site 1, located in Harrison County, Iowa, is a local government-owned earth dam completed in 1958 by the USDA NRCS. This multipurpose structure serves as a fire protection, stock, and small fish pond, as well as contributing to flood risk reduction in the area. With a dam height of 57 feet and a storage capacity of 209 acre-feet, this dam spans 390 feet in length and covers a surface area of 7.5 acres, impacting a drainage area of 0.42 square miles.

Managed by the Iowa DNR, this site is regulated, inspected, and enforced by the state, ensuring its compliance with safety standards. Although last inspected in 1965, the dam is deemed to have low hazard potential and its condition remains unrated. The risk assessment for this site indicates a moderate risk level, suggesting the need for ongoing monitoring and potential risk management measures. Overall, South Magnolia Watershed Site 1 plays a crucial role in water resource management, environmental protection, and climate resilience in the region, highlighting the importance of sustainable infrastructure for safeguarding communities and ecosystems.