North Mountain Flood Detention #3
Key Takeaway
North Mountain Flood Detention #3 is classified as high hazard in Arizona. It was completed in 1975 and is 51 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 | 26 ft (taller than 45.6% in AZ) |
| Dam Length | 1,040 ft |
| Dam Type | Earth |
| Max Storage | 136 acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 4,120 cfs |
| Year Completed | 1975 (51 years old) |
| NID ID | AZ00172 |
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 PHOENIX, STREET TRANSPORTATION DEPT.
Local Government
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High Hazard 65 ftFrequently Asked Questions
What is the hazard classification of North Mountain Flood Detention #3?
North Mountain Flood Detention #3 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 North Mountain Flood Detention #3?
North Mountain Flood Detention #3 is owned by CITY OF PHOENIX, STREET TRANSPORTATION DEPT. (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was North Mountain Flood Detention #3 built?
North Mountain Flood Detention #3 was completed in 1975, making it 51 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 North Mountain Flood Detention #3?
North Mountain Flood Detention #3 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is North Mountain Flood Detention #3?
North Mountain Flood Detention #3 has a dam height of 26 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 North Mountain Flood Detention #3 last inspected?
North Mountain Flood Detention #3 was last inspected on February 25, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.