Thomas Dam
Thomas Dam is an earth dam located in Marion County, Tennessee, built in 2002. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Thomas Dam
The primary purpose of Thomas Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Sequatchie Concrete Service, Inc. (private). It impounds the Trib-wildcat Branch.
The dam stands 44 feet tall and stretches 1,126 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 217 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2002, the structure is relatively new.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 01/21/2026.
At 44 feet, this dam is taller than 90% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Tennessee dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Tennessee |
| County | Marion |
| River/Stream | Trib-wildcat Branch |
| Coordinates | 35.21250, -85.86111 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Length | 1,126 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 217 acre-ft |
| Max Storage | 217 acre-ft |
| Normal Storage | 162 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Sequatchie Concrete Service, Inc. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/21/2026 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TN11510 |
| Federal ID | TN11510 |
| More Info | State Dam Safety Program |