Dionysus Dam
Key Takeaway
Dionysus Dam is classified as high hazard in Washington. It was completed in 1973 and is 53 years old. Its primary use is irrigation. 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 Length | 2,284 ft |
| Dam Type | Earth |
| Max Storage | 53 acre-ft |
| Normal Storage | 28 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1973 (53 years old) |
| NID ID | WA01985 |
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
North Columbia River Road Pasco WA, LLC
Private
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Low HazardFrequently Asked Questions
What is the hazard classification of Dionysus Dam?
Dionysus Dam 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 Dionysus Dam?
Dionysus Dam is owned by North Columbia River Road Pasco WA, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Dionysus Dam built?
Dionysus Dam was completed in 1973, making it 53 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 Dionysus Dam?
Dionysus Dam serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Dionysus Dam last inspected?
Dionysus Dam was last inspected on November 7, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.