Milliken
Key Takeaway
Milliken is classified as high hazard in California. It was completed in 1924 and is 102 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 | 110 ft (taller than 83.9% in CA) |
| Dam Length | 647 ft |
| Dam Type | Arch |
| Max Storage | 2.0K acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 9 sq mi |
| Year Completed | 1924 (102 years old) |
| NID ID | CA00102 |
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 Napa
Local Government
Nearby Dams
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Low Hazard 39 ftLake Madigan
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Significant Hazard 50 ftFrequently Asked Questions
What is the hazard classification of Milliken?
Milliken 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 Milliken?
Milliken is owned by City of Napa (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Milliken built?
Milliken was completed in 1924, making it 102 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 Milliken?
Milliken serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Milliken?
Milliken has a dam height of 110 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 Milliken last inspected?
Milliken was last inspected on January 5, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.