Millett Swale
Key Takeaway
Millett Swale is classified as high hazard in Arizona. It was completed in 1958 and is 68 years old. Its primary use is flood risk reduction. 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 | 24 ft (taller than 42.3% in AZ) |
| Dam Length | 2,500 ft |
| Dam Type | Earth |
| Max Storage | 2.1K acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 200 acres |
| Drainage Area | 40 sq mi |
| Max Discharge | 6,120 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | AZ00059 |
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
Silver Creek Irrigation District
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Millett Swale?
Millett Swale 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 Millett Swale?
Millett Swale is owned by Silver Creek Irrigation District (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Millett Swale built?
Millett Swale was completed in 1958, making it 68 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 Millett Swale?
Millett Swale serves the following purposes: Flood Risk Reduction, Debris Control. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Millett Swale?
Millett Swale has a dam height of 24 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 Millett Swale last inspected?
Millett Swale was last inspected on April 23, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.