Johnston Lake Dam is an earth dam located in Floyd County, Georgia, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 1,800 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 Johnston Lake Dam
The primary purpose of Johnston Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Johnston, Jerry C. (private). It impounds the Unknown near Armuchee.
The dam stands 15 feet tall and stretches 1,800 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 192 acre-feet, and collects water from a drainage area of 49 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 03/01/2018.
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Location
| State | Georgia |
| County | Floyd |
| Nearest City | Armuchee |
| River/Stream | Unknown |
| Coordinates | 34.37875, -85.11550 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 12 ft |
| Dam Length | 1,800 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 192 acre-ft |
| Max Storage | 192 acre-ft |
| Normal Storage | 132 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 49 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Johnston, Jerry C. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 03/01/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | GA00748 |
| Federal ID | GA00748 |
| More Info | State Dam Safety Program |