Johnson Creek #4 Dam is an earth dam located in Madison County, Tennessee, built in 1959. It carries a Significant hazard potential classification.
Dam profile
NID height · 29 ft29 ft tall and 1,033 ft long, taller than 65% 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 #4 Dam
Johnson Creek #4 Dam is a dam in Madison, Tennessee. The dam is owned by Dement Construction, Et Al. (private). It impounds the Hart Creek near Oak Grove.
The dam stands 29 feet tall and stretches 1,033 feet across, creates a reservoir covering 62 acres, has a maximum storage capacity of 1,370 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1959, 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. The most recent inspection on record was 02/12/2020.
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Location
| State | Tennessee |
| County | Madison |
| Nearest City | Oak Grove |
| River/Stream | Hart Creek |
| Coordinates | 35.51611, -88.93611 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Length | 1,033 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 1,370 acre-ft |
| Max Storage | 1,370 acre-ft |
| Normal Storage | 263 acre-ft |
| Surface Area | 62 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Dement Construction, Et Al. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 02/12/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TN11306 |
| Federal ID | TN11306 |
| More Info | State Dam Safety Program |