Lake Johnson Dam
Key Takeaway
Lake Johnson Dam is classified as high hazard in North Carolina. It was completed in 1914 and is 112 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Length | 779 ft |
| Dam Type | Earth |
| Max Storage | 3.1K acre-ft |
| Normal Storage | 2.6K acre-ft |
| Surface Area | 148 acres |
| Drainage Area | 4,403 sq mi |
| Max Discharge | 2,070 cfs |
| Year Completed | 1914 (112 years old) |
| Year Modified | 2006 |
| NID ID | NC00862 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
City of Raleigh Public Utilities Department
Public Utility
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Low HazardFrequently Asked Questions
What is the hazard classification of Lake Johnson Dam?
Lake Johnson Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Lake Johnson Dam?
Lake Johnson Dam is owned by City of Raleigh Public Utilities Department (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Johnson Dam built?
Lake Johnson Dam was completed in 1914, making it 112 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Lake Johnson Dam?
Lake Johnson Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Lake Johnson Dam last inspected?
Lake Johnson Dam was last inspected on February 15, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.