South Anna Dam #4
Key Takeaway
South Anna Dam #4 is classified as high hazard in Virginia. It was completed in 1981 and is 45 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 | 32 ft (taller than 74.1% in VA) |
| Dam Length | 830 ft |
| Dam Type | Earth |
| Max Storage | 2.1K acre-ft |
| Normal Storage | 84 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 4 sq mi |
| Year Completed | 1981 (45 years old) |
| NID ID | VA109032 |
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
Thomas Jefferson Soil and Water Conservation District
Local Government
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What is the hazard classification of South Anna Dam #4?
South Anna Dam #4 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 South Anna Dam #4?
South Anna Dam #4 is owned by Thomas Jefferson Soil and Water Conservation District (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was South Anna Dam #4 built?
South Anna Dam #4 was completed in 1981, making it 45 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 South Anna Dam #4?
South Anna Dam #4 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 South Anna Dam #4?
South Anna Dam #4 has a dam height of 32 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 South Anna Dam #4 last inspected?
South Anna Dam #4 was last inspected on December 7, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.