Three Mile Creek Watershed Site 3, located in Union County, Iowa, is a significant earth dam structure built in 1970 by the USDA NRCS. The dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 33 feet and a length of 420 feet, the dam has a storage capacity of 51 acre-feet and covers a surface area of 3.8 acres. It is regulated, permitted, inspected, and enforced by the Iowa Department of Natural Resources, ensuring its safety and compliance with state regulations.

Despite being classified as low hazard potential, the site has a moderate risk assessment score of 3. The dam's condition is currently not rated, and there is no information available on emergency action plans or risk management measures. The structure is not owned or funded by federal agencies, but it is maintained and operated by local government authorities. With its crucial role in water resource management and flood control in the Three Mile Creek watershed, the dam at Site 3 plays a vital role in protecting the surrounding area from potential water-related disasters.

For water resource and climate enthusiasts, Three Mile Creek Watershed Site 3 offers a fascinating case study in dam infrastructure and management. The dam's design, construction, and regulatory oversight provide valuable insights into the complexities of water resource management and the importance of maintaining critical infrastructure for both practical and environmental purposes. As a key component of the watershed's ecosystem, understanding and monitoring the dam at Site 3 is essential for ensuring the sustainability and resilience of this vital water resource in Union County, Iowa.