Mormon Flat
Key Takeaway
Mormon Flat is classified as high hazard in Arizona. It was completed in 1924 and is 102 years old. Its primary use is hydroelectric. 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 | 224 ft (taller than 95.8% in AZ) |
| Dam Length | 380 ft |
| Dam Type | Concrete |
| Max Storage | 57.9K acre-ft |
| Normal Storage | 57.9K acre-ft |
| Surface Area | 950 acres |
| Drainage Area | 120 sq mi |
| Year Completed | 1924 (102 years old) |
| NID ID | AZ10313 |
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
RECLAMATION
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Mormon Flat?
Mormon Flat 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 Mormon Flat?
Mormon Flat is owned by RECLAMATION (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Mormon Flat built?
Mormon Flat 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 Mormon Flat?
Mormon Flat serves the following purposes: Hydroelectric, Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Mormon Flat?
Mormon Flat has a dam height of 224 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 Mormon Flat last inspected?
Mormon Flat was last inspected on October 12, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.