Twin Lakes Upper Dam is a dam located in Spartanburg County, South Carolina, built in 1964. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 34 ft34 ft tall, taller than 78% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Twin Lakes Upper Dam
The primary purpose of Twin Lakes Upper Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Twin Lakes Club of Spartanburg Inc (private). It impounds the Tr-middle Tyger River.
The dam stands 34 feet tall, creates a reservoir covering 23 acres, and has a maximum storage capacity of 405 acre-feet. Completed in 1964, the structure is well into its service life at over 50 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 08/12/2024.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | South Carolina |
| County | Spartanburg |
| River/Stream | Tr-middle Tyger River |
| Coordinates | 34.88630, -82.03850 |
Physical Characteristics
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 405 acre-ft |
| Max Storage | 405 acre-ft |
| Normal Storage | 276 acre-ft |
| Surface Area | 23 acres |
Ownership & Safety
| Purpose | Recreation |
| Owner | Twin Lakes Club of Spartanburg Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/12/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | SCD03347 |
| Federal ID | SCD03347 |
| More Info | State Dam Safety Program |