Em Johnson Alum Sludge Lagoon Dam
Key Takeaway
Em Johnson Alum Sludge Lagoon Dam is classified as high hazard in North Carolina. It was completed in 1994 and is 32 years old. Its primary use is other. 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 | 1,600 ft |
| Dam Type | Earth |
| Max Storage | 108 acre-ft |
| Normal Storage | 90 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 14 sq mi |
| Max Discharge | 190 cfs |
| Year Completed | 1994 (32 years old) |
| NID ID | NC04460 |
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
Private
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High HazardFrequently Asked Questions
What is the hazard classification of Em Johnson Alum Sludge Lagoon Dam?
Em Johnson Alum Sludge Lagoon 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 Em Johnson Alum Sludge Lagoon Dam?
Em Johnson Alum Sludge Lagoon Dam is owned by City of Raleigh Public Utilities Department (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Em Johnson Alum Sludge Lagoon Dam built?
Em Johnson Alum Sludge Lagoon Dam was completed in 1994, making it 32 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 Em Johnson Alum Sludge Lagoon Dam?
Em Johnson Alum Sludge Lagoon Dam serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Em Johnson Alum Sludge Lagoon Dam last inspected?
Em Johnson Alum Sludge Lagoon Dam was last inspected on March 22, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.