Lake Arthur
Key Takeaway
Lake Arthur is classified as high hazard in California. It was completed in 1909 and is 117 years old. Its primary use is other. 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 | 44 ft (taller than 52.6% in CA) |
| Dam Length | 290 ft |
| Dam Type | Earth |
| Max Storage | 87 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 2 sq mi |
| Year Completed | 1909 (117 years old) |
| NID ID | CA00356 |
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
Placer County Water Agency
Local Government
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Lake Arthur?
Lake Arthur 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 Lake Arthur?
Lake Arthur is owned by Placer County Water Agency (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Arthur built?
Lake Arthur was completed in 1909, making it 117 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 Lake Arthur?
Lake Arthur serves the following purposes: Other, Irrigation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Arthur?
Lake Arthur has a dam height of 44 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 Lake Arthur last inspected?
Lake Arthur was last inspected on December 20, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.