N-1 Settling Area is an earth dam located in Hardee County, Florida, built in 1978. It carries a Significant hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 11,200 ft long, taller than 80% 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 N-1 Settling Area
The primary purpose of N-1 Settling Area 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 Hickey Branch near Fort Green.
The dam stands 35 feet tall and stretches 11,200 feet across, creates a reservoir covering 154 acres, and has a maximum storage capacity of 5,400 acre-feet. Completed in 1978, the structure is 48 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 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Florida |
| County | Hardee |
| Nearest City | Fort Green |
| River/Stream | Hickey Branch |
| Coordinates | 27.62000, -81.94000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 11,200 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 5,400 acre-ft |
| Max Storage | 5,400 acre-ft |
| Normal Storage | 4,200 acre-ft |
| Surface Area | 154 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 | FL00574 |
| Federal ID | FL00574 |
| More Info | State Dam Safety Program |