Thorn Run
Key Takeaway
Thorn Run is classified as high hazard in Pennsylvania. It was completed in 1903 and is 123 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 | 40 ft (taller than 77.2% in PA) |
| Dam Length | 660 ft |
| Dam Type | Earth |
| Max Storage | 960 acre-ft |
| Normal Storage | 560 acre-ft |
| Surface Area | 49 acres |
| Drainage Area | 6 sq mi |
| Year Completed | 1903 (123 years old) |
| NID ID | PA00271 |
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 AMERICAN WATER COMPANY
Private
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Thorn Run?
Thorn Run 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 Thorn Run?
Thorn Run is owned by PA AMERICAN WATER COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thorn Run built?
Thorn Run was completed in 1903, making it 123 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 Thorn Run?
Thorn Run 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 Thorn Run?
Thorn Run has a dam height of 40 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 Thorn Run last inspected?
Thorn Run was last inspected on June 8, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.