Roosevelt Reservoir
Key Takeaway
Roosevelt Reservoir is classified as high hazard in Washington. It was completed in 1910 and is 116 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 Length | 1,920 ft |
| Dam Type | Earth |
| Max Storage | 181 acre-ft |
| Normal Storage | 153 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 45 cfs |
| Year Completed | 1910 (116 years old) |
| NID ID | WA00212 |
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
Seattle Public Utilities
Local Government
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High HazardFrequently Asked Questions
What is the hazard classification of Roosevelt Reservoir?
Roosevelt Reservoir 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 Roosevelt Reservoir?
Roosevelt Reservoir is owned by Seattle Public Utilities (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Roosevelt Reservoir built?
Roosevelt Reservoir was completed in 1910, making it 116 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 Roosevelt Reservoir?
Roosevelt Reservoir serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Roosevelt Reservoir last inspected?
Roosevelt Reservoir was last inspected on September 5, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.