Manahawkin Lake Dam
Key Takeaway
Manahawkin Lake Dam is classified as significant hazard in New Jersey. It was completed in 1929 and is 97 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 12 ft (taller than 31.2% in NJ) |
| Dam Length | 900 ft |
| Dam Type | Earth |
| Normal Storage | 127 acre-ft |
| Surface Area | 54 acres |
| Drainage Area | 20 sq mi |
| Max Discharge | 1,908 cfs |
| Year Completed | 1929 (97 years old) |
| NID ID | NJ00057 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
County of Ocean
Local Government
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Significant HazardFrequently Asked Questions
What is the hazard classification of Manahawkin Lake Dam?
Manahawkin Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Manahawkin Lake Dam?
Manahawkin Lake Dam is owned by County of Ocean (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Manahawkin Lake Dam built?
Manahawkin Lake Dam was completed in 1929, making it 97 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 Manahawkin Lake Dam?
Manahawkin Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Manahawkin Lake Dam?
Manahawkin Lake Dam has a dam height of 12 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 Manahawkin Lake Dam last inspected?
Manahawkin Lake Dam was last inspected on September 10, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.