Black Lake Dam is an earth dam located in Gwinnett County, Georgia, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 700 ft long. 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 Black Lake Dam
The primary purpose of Black Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Black, Ralph E. (private). It impounds the Unknown near Dunwoody.
The dam stands 17 feet tall and stretches 700 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 86 acre-feet, and collects water from a drainage area of 190 square miles. Completed in 1958, the structure is well into its service life at over 50 years 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. The most recent inspection on record was 09/01/2013. That was over 13 years ago.
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Location
| State | Georgia |
| County | Gwinnett |
| Nearest City | Dunwoody |
| River/Stream | Unknown |
| Coordinates | 33.99528, -84.21500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 16 ft |
| Dam Length | 700 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 94 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 94 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 190 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Black, Ralph E. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/01/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | GA01816 |
| Federal ID | GA01816 |
| More Info | State Dam Safety Program |