Lower Lake Mary
Key Takeaway
Lower Lake Mary is classified as high hazard in Arizona. It was completed in 1907 and is 119 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 | 33 ft (taller than 59.3% in AZ) |
| Dam Length | 650 ft |
| Dam Type | Earth |
| Max Storage | 22.4K acre-ft |
| Normal Storage | 11.0K acre-ft |
| Surface Area | 910 acres |
| Drainage Area | 27 sq mi |
| Max Discharge | 3,298 cfs |
| Year Completed | 1907 (119 years old) |
| NID ID | AZ00015 |
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
USDA FS
Federal Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Lower Lake Mary?
Lower Lake Mary 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 Lower Lake Mary?
Lower Lake Mary is owned by USDA FS (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Lake Mary built?
Lower Lake Mary was completed in 1907, making it 119 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 Lower Lake Mary?
Lower Lake Mary serves the following purposes: Water Supply, Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lower Lake Mary?
Lower Lake Mary has a dam height of 33 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 Lower Lake Mary last inspected?
Lower Lake Mary was last inspected on September 10, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.