Thorn Tree Dam, located in Indianola, Iowa, is a privately owned structure with a primary purpose of recreation. Constructed in 1997, this earth dam stands at a height of 42 feet and has a length of 663 feet. The dam serves multiple purposes including irrigation and recreation, with a storage capacity of 285 acre-feet and a surface area of 12.9 acres.

Managed by the Iowa Department of Natural Resources, Thorn Tree Dam is regulated, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. The dam is classified as having low hazard potential and a moderate risk assessment rating of 3. While not currently rated for its condition, it remains an important water resource for the area, situated on the TR- South River and providing essential water storage and recreational opportunities for the community.

Overall, Thorn Tree Dam plays a crucial role in water resource management and recreation in Warren County, Iowa. With its controlled spillway and state-regulated operations, the dam serves as a valuable asset for the local community while mitigating potential risks associated with its moderate risk assessment. As a focal point for water enthusiasts and climate advocates, Thorn Tree Dam stands as a testament to the importance of sustainable water resource management and the preservation of natural habitats.