Winkler Dam, located in Ottumwa, Iowa, is a private dam constructed in 1963 on the TR-Des Moines River. With a height of 30 feet and a length of 500 feet, the dam primarily serves for recreational purposes, providing a storage capacity of 156 acre-feet. Managed by the Iowa Department of Natural Resources, Winkler Dam is regulated, inspected, and enforced by the state, ensuring its safety and compliance with regulations.

Despite its low hazard potential, Winkler Dam is classified as having a moderate risk level, indicating the need for risk management measures. While the dam has not been rated for its condition, it meets the guidelines for emergency action plans. Although there are no associated structures or outlet gates, the dam's uncontrolled spillway and soil foundation contribute to its operational and structural stability.

Water resource and climate enthusiasts would find Winkler Dam an interesting site for its recreational value and environmental significance in the Wapello County area. The dam provides a unique opportunity for outdoor activities and water-based recreation, while also highlighting the importance of proper dam management and risk assessment in ensuring public safety and environmental protection in the region.