Antietam
Key Takeaway
Antietam is classified as high hazard in Pennsylvania. It was completed in 1953 and is 73 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 | 70 ft (taller than 91.5% in PA) |
| Dam Length | 815 ft |
| Dam Type | Earth |
| Max Storage | 866 acre-ft |
| Normal Storage | 464 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 4 sq mi |
| Year Completed | 1953 (73 years old) |
| NID ID | PA00332 |
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
BOROUGH OF WAYNESBORO
Local Government
Nearby Dams
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Significant Hazard 28 ftLake May (Section F)
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High Hazard 22 ftLower Lake Royer
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High Hazard 19 ftFrequently Asked Questions
What is the hazard classification of Antietam?
Antietam 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 Antietam?
Antietam is owned by BOROUGH OF WAYNESBORO (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Antietam built?
Antietam was completed in 1953, making it 73 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 Antietam?
Antietam 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 Antietam?
Antietam has a dam height of 70 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 Antietam last inspected?
Antietam was last inspected on December 9, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.