Hadley (Pa-489)
Key Takeaway
Hadley (Pa-489) is classified as high hazard in Pennsylvania. It was completed in 1968 and is 58 years old. Its primary use is flood risk reduction. 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 | 51 ft (taller than 84.8% in PA) |
| Dam Length | 750 ft |
| Dam Type | Earth |
| Max Storage | 820 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 5 sq mi |
| Year Completed | 1968 (58 years old) |
| NID ID | PA00245 |
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
MERCER COUNTY COMMISSIONERS
Local Government
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What is the hazard classification of Hadley (Pa-489)?
Hadley (Pa-489) 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 Hadley (Pa-489)?
Hadley (Pa-489) is owned by MERCER COUNTY COMMISSIONERS (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hadley (Pa-489) built?
Hadley (Pa-489) was completed in 1968, making it 58 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 Hadley (Pa-489)?
Hadley (Pa-489) serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Hadley (Pa-489)?
Hadley (Pa-489) has a dam height of 51 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 Hadley (Pa-489) last inspected?
Hadley (Pa-489) was last inspected on September 10, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.