Located in Des Moines, Iowa, Gerdner Dam is a privately owned structure with a primary purpose of fire protection, stock, or small fish pond. Completed in 1945, this earth dam stands at a height of 25 feet and spans 200 feet in length, with a storage capacity of 55 acre-feet. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections, with a low hazard potential and a moderate risk assessment rating.

Situated on the TR-Yellow Spring River, Gerdner Dam serves as a vital resource for the surrounding community, providing water for fire protection and creating a small fish pond for recreational purposes. Despite its age, the dam remains in good condition and meets regulatory guidelines for safety and operation. The dam's low hazard potential and moderate risk assessment highlight the importance of ongoing monitoring and maintenance to ensure its continued functionality and safety for water resource and climate enthusiasts in the area.

With a surface area of 4 acres and a drainage area of 0.43 square miles, Gerdner Dam plays a key role in managing water flow and storage in the region. The uncontrolled spillway type and lack of outlet gates indicate a simple design focused on its primary purposes. As a privately owned structure, Gerdner Dam stands as a testament to the importance of private ownership in maintaining and managing water resources effectively, while also highlighting the need for continued oversight and investment in infrastructure for water security and climate resilience.