Alder Marsh
Key Takeaway
Alder Marsh is classified as high hazard in Pennsylvania. It was completed in 1948 and is 78 years old. Its primary use is recreation. 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 | 10 ft (taller than 8.3% in PA) |
| Dam Length | 175 ft |
| Dam Type | Earth |
| Max Storage | 266 acre-ft |
| Normal Storage | 78 acre-ft |
| Surface Area | 39 acres |
| Drainage Area | 1 sq mi |
| Year Completed | 1948 (78 years old) |
| NID ID | PA00153 |
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
PA GAME COMMISSION
State Government
Nearby Dams
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High Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Alder Marsh?
Alder Marsh 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 Alder Marsh?
Alder Marsh is owned by PA GAME COMMISSION (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Alder Marsh built?
Alder Marsh was completed in 1948, making it 78 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 Alder Marsh?
Alder Marsh 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 Alder Marsh?
Alder Marsh has a dam height of 10 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 Alder Marsh last inspected?
Alder Marsh was last inspected on December 10, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.