4 West
Key Takeaway
4 West is classified as high hazard in Arizona. Its primary use is tailings. 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 | 226 ft (taller than 96.4% in AZ) |
| Dam Length | 1 ft |
| Dam Type | Earth |
| Max Storage | 93.3K acre-ft |
| NID ID | AZ83457 |
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
Freeport McMoran Morenci Inc.
Private
Nearby Dams
3 West
Graham, AZ
Low Hazard 307 ft2 West
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Significant Hazard 225 ft1 West
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Low Hazard 400 ftChesley-Wamslee
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High Hazard 42 ftHoward
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High Hazard 45 ftLee
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High Hazard 61 ftBillingsley Dam
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High HazardFrequently Asked Questions
What is the hazard classification of 4 West?
4 West 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 4 West?
4 West is owned by Freeport McMoran Morenci Inc. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
What is the primary purpose of 4 West?
4 West serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is 4 West?
4 West has a dam height of 226 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.