South Zumbro Wr-6a is a vital flood risk reduction structure located in Olmsted, Minnesota, along Willow Creek. Owned by the local government and designed by USDA NRCS, this Earth-type dam stands at 56 feet tall and stretches 1600 feet in length. Completed in 1989, it has a storage capacity of 1696 acre-feet and serves the primary purpose of flood risk reduction in the region.

With a high hazard potential and a satisfactory condition assessment as of June 2017, South Zumbro Wr-6a is regulated by the MNDNR EWR and undergoes regular inspections, with the last one conducted in October 2020. Despite its controlled spillway and uncontrolled outlet gates, the dam poses a very high risk, which calls for effective risk management measures to ensure the safety of the surrounding communities. Being situated in a region with a very high flood risk, this dam plays a crucial role in protecting the area from potential disasters and highlights the importance of proper infrastructure for water resource management in the face of changing climatic conditions.