Johnson Pond Dam
Key Takeaway
Johnson Pond Dam is classified as high hazard in Washington. It was completed in 2011 and is 15 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 Length | 130 ft |
| Dam Type | Earth |
| Max Storage | 43 acre-ft |
| Normal Storage | 17 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 10 cfs |
| Year Completed | 2011 (15 years old) |
| NID ID | WA01999 |
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
King County Natural Resources and Parks
Local Government
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Low HazardFrequently Asked Questions
What is the hazard classification of Johnson Pond Dam?
Johnson Pond 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 Johnson Pond Dam?
Johnson Pond Dam is owned by King County Natural Resources and Parks (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnson Pond Dam built?
Johnson Pond Dam was completed in 2011, making it 15 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 Johnson Pond Dam?
Johnson Pond Dam serves the following purposes: Flood Risk Reduction, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Johnson Pond Dam last inspected?
Johnson Pond Dam was last inspected on July 13, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.