Clark Mills (Pa-490)
Key Takeaway
Clark Mills (Pa-490) is classified as high hazard in Pennsylvania. It was completed in 1971 and is 55 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 | 45 ft (taller than 81.2% in PA) |
| Dam Length | 430 ft |
| Dam Type | Earth |
| Max Storage | 790 acre-ft |
| Normal Storage | 19 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 3 sq mi |
| Year Completed | 1971 (55 years old) |
| NID ID | PA00246 |
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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High Hazard 34 ftFrequently Asked Questions
What is the hazard classification of Clark Mills (Pa-490)?
Clark Mills (Pa-490) 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 Clark Mills (Pa-490)?
Clark Mills (Pa-490) is owned by MERCER COUNTY COMMISSIONERS (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Clark Mills (Pa-490) built?
Clark Mills (Pa-490) was completed in 1971, making it 55 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 Clark Mills (Pa-490)?
Clark Mills (Pa-490) 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 Clark Mills (Pa-490)?
Clark Mills (Pa-490) has a dam height of 45 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 Clark Mills (Pa-490) last inspected?
Clark Mills (Pa-490) was last inspected on September 10, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.