Upper Lake Mary
Key Takeaway
Upper Lake Mary is classified as significant hazard in Arizona. It was completed in 1941 and is 85 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 38 ft (taller than 66.8% in AZ) |
| Dam Length | 845 ft |
| Dam Type | Earth |
| Max Storage | 21.0K acre-ft |
| Normal Storage | 16.6K acre-ft |
| Surface Area | 1,058 acres |
| Drainage Area | 54 sq mi |
| Max Discharge | 11,000 cfs |
| Year Completed | 1941 (85 years old) |
| NID ID | AZ00016 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CITY OF FLAGSTAFF
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Upper Lake Mary?
Upper Lake Mary is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Upper Lake Mary?
Upper Lake Mary is owned by CITY OF FLAGSTAFF (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Lake Mary built?
Upper Lake Mary was completed in 1941, making it 85 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 Upper Lake Mary?
Upper Lake Mary serves the following purposes: Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Upper Lake Mary?
Upper Lake Mary has a dam height of 38 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 Upper Lake Mary last inspected?
Upper Lake Mary was last inspected on June 26, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.