Porches Mill Dam
Key Takeaway
Porches Mill Dam is classified as low hazard in New Jersey. It was completed in 1923 and is 103 years old. Its primary use is recreation.
Physical Details
| Dam Height | 20 ft (taller than 72.4% in NJ) |
| Dam Length | 350 ft |
| Dam Type | Earth |
| Normal Storage | 76 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 800 cfs |
| Year Completed | 1923 (103 years old) |
| NID ID | NJ00113 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
James Hargrave
Private
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Low Hazard 13 ftFrequently Asked Questions
What is the hazard classification of Porches Mill Dam?
Porches Mill Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Porches Mill Dam?
Porches Mill Dam is owned by James Hargrave (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Porches Mill Dam built?
Porches Mill Dam was completed in 1923, making it 103 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 Porches Mill Dam?
Porches Mill 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 Porches Mill Dam?
Porches Mill Dam has a dam height of 20 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 Porches Mill Dam last inspected?
Porches Mill Dam was last inspected on August 8, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.