Ponderosa Lake Dam
Key Takeaway
Ponderosa Lake Dam is classified as high hazard in Washington. It was completed in 1969 and is 57 years old. Its primary use is recreation. 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 | 500 ft |
| Dam Type | Earth |
| Max Storage | 1.4K acre-ft |
| Normal Storage | 710 acre-ft |
| Surface Area | 75 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 500 cfs |
| Year Completed | 1969 (57 years old) |
| NID ID | WA00041 |
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
Pearl Street Apartments LLC
Private
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High HazardFrequently Asked Questions
What is the hazard classification of Ponderosa Lake Dam?
Ponderosa Lake 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 Ponderosa Lake Dam?
Ponderosa Lake Dam is owned by Pearl Street Apartments LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Ponderosa Lake Dam built?
Ponderosa Lake Dam was completed in 1969, making it 57 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 Ponderosa Lake Dam?
Ponderosa Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Ponderosa Lake Dam last inspected?
Ponderosa Lake Dam was last inspected on August 30, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.