Thomas is a private dam located in Marion, Tennessee, with a primary purpose of flood risk reduction. Constructed in 2002, this Earth-type dam stands at a structural height of 44 feet and has a hydraulic height of 41 feet. With a storage capacity of 217 acre-feet and a surface area of 16.1 acres, Thomas plays a crucial role in managing water resources in the area.

Managed by the Tennessee Safe Dams Program, Thomas is regulated, permitted, inspected, and enforced by the state. The dam has a high hazard potential but is currently in satisfactory condition, as assessed during the last inspection in December 2020. Despite its moderate risk assessment, Thomas provides vital flood protection for the surrounding area, effectively reducing the impact of potential disasters on the local community.

Located on the TRIBWILDCAT BRANCH river, Thomas is under the jurisdiction of the Nashville District and falls under the representation of Rep. Scott DesJarlais. With no associated structures and no federal agency involvement, Thomas remains a privately owned and operated structure dedicated to flood risk reduction. As water resource and climate enthusiasts, understanding the importance of dams like Thomas in ensuring water safety and flood control is crucial for sustainable water management practices.