John Grier Dam is a dam located in McCormick County, South Carolina, built in 1910. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 23 ft23 ft tall. 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 John Grier Dam
The primary purpose of John Grier Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John Calvin Grier (private). It impounds the Tr-rocky Creek.
The dam stands 23 feet tall, creates a reservoir covering 13 acres, and has a maximum storage capacity of 114 acre-feet. Completed in 1910, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 09/26/2017.
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Location
| State | South Carolina |
| County | McCormick |
| River/Stream | Tr-rocky Creek |
| Coordinates | 33.98940, -82.27310 |
Physical Characteristics
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 114 acre-ft |
| Max Storage | 114 acre-ft |
| Normal Storage | 101 acre-ft |
| Surface Area | 13 acres |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John Calvin Grier |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/26/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SCD00642 |
| Federal ID | SCD00642 |
| More Info | State Dam Safety Program |