Marshall Lake Dam
Key Takeaway
Marshall Lake Dam is classified as high hazard in Washington. It was completed in 1912 and is 114 years old. Its primary use is irrigation. 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 | 565 ft |
| Dam Type | Earth |
| Max Storage | 1.9K acre-ft |
| Normal Storage | 1.3K acre-ft |
| Surface Area | 219 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 133 cfs |
| Year Completed | 1912 (114 years old) |
| NID ID | WA00353 |
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
Marshall Lake LLC
Private
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Low HazardFrequently Asked Questions
What is the hazard classification of Marshall Lake Dam?
Marshall 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 Marshall Lake Dam?
Marshall Lake Dam is owned by Marshall Lake LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Marshall Lake Dam built?
Marshall Lake Dam was completed in 1912, making it 114 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 Marshall Lake Dam?
Marshall Lake Dam serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Marshall Lake Dam last inspected?
Marshall Lake Dam was last inspected on November 13, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.