Noralyn N-11a
Key Takeaway
Noralyn N-11a is classified as significant hazard in Florida. It was completed in 1963 and is 63 years old. Its primary use is tailings. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 25 ft (taller than 63.5% in FL) |
| Dam Length | 5,300 ft |
| Dam Type | Earth |
| Max Storage | 5.3K acre-ft |
| Normal Storage | 5.3K acre-ft |
| Surface Area | 212 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 500 cfs |
| Year Completed | 1963 (63 years old) |
| NID ID | FL00646 |
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
THE MOSAIC COMPANY
Private
Nearby Dams
Noralyn N-11c
Polk, FL
Low Hazard 40 ftNoralyn N-3
Polk, FL
Significant Hazard 12 ftNoralyn N-11b
Polk, FL
Significant Hazard 14 ftNoralyn N-15
Polk, FL
Low Hazard 40 ftNoralyn N-13
Polk, FL
Low Hazard 40 ftNoralyn N-13
Polk, FL
Significant Hazard 25 ftNoralyn N-8
Polk, FL
Significant Hazard 24 ftNoralyn N-6
Polk, FL
Significant Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Noralyn N-11a?
Noralyn N-11a 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 Noralyn N-11a?
Noralyn N-11a is owned by THE MOSAIC COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Noralyn N-11a built?
Noralyn N-11a was completed in 1963, making it 63 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 Noralyn N-11a?
Noralyn N-11a serves the following purposes: Tailings. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Noralyn N-11a?
Noralyn N-11a has a dam height of 25 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.