Johnson Dam is an earth dam located in Shelby County, Tennessee, built in 1950. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 415 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 Johnson Dam
The primary purpose of Johnson Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Johnson, Hardy, Jr. (private). It impounds the Big Creek Drainage Canal.
The dam stands 11 feet tall and stretches 415 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 48 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1950, the structure is well-established, with more than 75 years of service.
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 12/07/2020.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Tennessee |
| County | Shelby |
| River/Stream | Big Creek Drainage Canal |
| Coordinates | 35.33750, -89.99083 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 415 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 48 acre-ft |
| Max Storage | 48 acre-ft |
| Normal Storage | 34 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Johnson, Hardy, Jr. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 12/07/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TN15767 |
| Federal ID | TN15767 |
| More Info | State Dam Safety Program |