Geronimo Dam
Geronimo Dam is an earth dam located in Cumberland County, Tennessee, built in 1980. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Geronimo Dam
Geronimo Dam is a dam in Cumberland, Tennessee. The dam is owned by Lake Tansi Village P.o.a. (private). It impounds the Stillhouse Creek near Coon Hollow.
The dam stands 33 feet tall and stretches 550 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 359 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1980, the structure is 46 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 03/12/2025.
At 33 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Tennessee |
| County | Cumberland |
| Nearest City | Coon Hollow |
| River/Stream | Stillhouse Creek |
| Coordinates | 35.88889, -85.03583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Length | 550 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 359 acre-ft |
| Max Storage | 359 acre-ft |
| Normal Storage | 182 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Lake Tansi Village P.o.a. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/12/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TN03536 |
| Federal ID | TN03536 |
| More Info | State Dam Safety Program |