Johnstone Lake Dam
Johnstone Lake Dam is an earth dam located in Madison County, Mississippi, built in 1965. It carries a High hazard potential classification and has a fair condition assessment.
About Johnstone Lake Dam
The primary purpose of Johnstone Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Johnstone Property Owners Association (private). It impounds the Persimmon Creek near N/a.
The dam stands 35 feet tall and stretches 1,900 feet across, creates a reservoir covering 104 acres, has a maximum storage capacity of 1,524 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/26/2022.
At 35 feet, this dam is taller than 82% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Mississippi dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Mississippi |
| County | Madison |
| Nearest City | N/a |
| River/Stream | Persimmon Creek |
| Coordinates | 32.53124, -90.18237 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 31 ft |
| Dam Length | 1,900 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 1,524 acre-ft |
| Max Storage | 1,524 acre-ft |
| Normal Storage | 1,058 acre-ft |
| Surface Area | 104 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1,175 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | JOHNSTONE PROPERTY OWNERS ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 10/26/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MS02258 |
| Federal ID | MS02258 |
| More Info | State Dam Safety Program |