Johnson Creek #7 Dam is an earth dam located in Madison County, Tennessee, built in 1960. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 41 ft41 ft tall and 1,191 ft long, taller than 87% 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 Johnson Creek #7 Dam
Johnson Creek #7 Dam is a dam in Madison, Tennessee. The dam is owned by Simo, LLC, Et Al. (private). It impounds the Lackey Creek near Oak Grove.
The dam stands 41 feet tall and stretches 1,191 feet across, creates a reservoir covering 60 acres, has a maximum storage capacity of 2,887 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1960, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 01/23/2025.
At 41 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Tennessee |
| County | Madison |
| Nearest City | Oak Grove |
| River/Stream | Lackey Creek |
| Coordinates | 35.56000, -88.89250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Length | 1,191 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 2,887 acre-ft |
| Max Storage | 2,887 acre-ft |
| Normal Storage | 398 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 4 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Simo, LLC, Et Al. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/23/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TN11305 |
| Federal ID | TN11305 |
| More Info | State Dam Safety Program |