Noralyn N-4 is an earth dam located in Polk County, Florida, built in 1958. It carries a Significant hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 3,800 ft long, taller than 82% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Noralyn N-4
The primary purpose of Noralyn N-4 is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by The Mosaic Company (private). It impounds the Peace River near Bartow.
The dam stands 36 feet tall and stretches 3,800 feet across, creates a reservoir covering 172 acres, and has a maximum storage capacity of 6,200 acre-feet. Completed in 1958, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Florida |
| County | Polk |
| Nearest City | Bartow |
| River/Stream | Peace River |
| Coordinates | 27.82000, -81.83000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 3,800 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 6,200 acre-ft |
| Max Storage | 6,200 acre-ft |
| Normal Storage | 6,200 acre-ft |
| Surface Area | 172 acres |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | FL00670 |
| Federal ID | FL00670 |
| More Info | State Dam Safety Program |