Regulating Basin West Dam
Key Takeaway
Regulating Basin West Dam is classified as high hazard in Washington. It was completed in 1962 and is 64 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 | 32 ft (taller than 38% in WA) |
| Dam Length | 320 ft |
| Dam Type | Earth |
| Max Storage | 882 acre-ft |
| Normal Storage | 1 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 45 cfs |
| Year Completed | 1962 (64 years old) |
| NID ID | WA00238 |
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 Seattle
Local Government
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High HazardFrequently Asked Questions
What is the hazard classification of Regulating Basin West Dam?
Regulating Basin West 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 Regulating Basin West Dam?
Regulating Basin West Dam is owned by City of Seattle (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Regulating Basin West Dam built?
Regulating Basin West Dam was completed in 1962, making it 64 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 Regulating Basin West Dam?
Regulating Basin West Dam serves the following purposes: Water Supply, Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Regulating Basin West Dam?
Regulating Basin West Dam 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 Regulating Basin West Dam last inspected?
Regulating Basin West Dam was last inspected on September 28, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.