Wynoochee
Key Takeaway
Wynoochee is classified as high hazard in Washington. It was completed in 1972 and is 54 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 | 175 ft (taller than 71.7% in WA) |
| Dam Length | 1,700 ft |
| Dam Type | Gravity |
| Max Storage | 76.0K acre-ft |
| Normal Storage | 69.4K acre-ft |
| Surface Area | 1,126 acres |
| Drainage Area | 41 sq mi |
| Max Discharge | 52,500 cfs |
| Year Completed | 1972 (54 years old) |
| NID ID | WA00302 |
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
City of Aberdeen
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Wynoochee?
Wynoochee 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 Wynoochee?
Wynoochee is owned by City of Aberdeen (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Wynoochee built?
Wynoochee was completed in 1972, making it 54 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 Wynoochee?
Wynoochee serves the following purposes: Water Supply, Fish And Wildlife Pond, Recreation, Hydroelectric, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Wynoochee?
Wynoochee has a dam height of 175 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 Wynoochee last inspected?
Wynoochee was last inspected on May 16, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.