Round Valley South Dam
Key Takeaway
Round Valley South Dam is classified as high hazard in New Jersey. It was completed in 1961 and is 65 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 Height | 178 ft (taller than 99.8% in NJ) |
| Dam Length | 1,395 ft |
| Dam Type | Earth |
| Max Storage | 196.6K acre-ft |
| Normal Storage | 168.0K acre-ft |
| Surface Area | 2,350 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1961 (65 years old) |
| NID ID | NJ00015 |
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
New Jersey Water Supply Authority
State Government
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Significant Hazard 14 ftFrequently Asked Questions
What is the hazard classification of Round Valley South Dam?
Round Valley South 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 Round Valley South Dam?
Round Valley South Dam is owned by New Jersey Water Supply Authority (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Round Valley South Dam built?
Round Valley South Dam was completed in 1961, making it 65 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 Round Valley South Dam?
Round Valley South 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.
How tall is Round Valley South Dam?
Round Valley South Dam has a dam height of 178 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Round Valley South Dam last inspected?
Round Valley South Dam was last inspected on October 1, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.