N1 Cf North is an earth dam located in Hardee County, Florida, built in 1980. It carries a Significant hazard potential classification.
Dam profile
NID height · 43 ft43 ft tall and 11,140 ft long, taller than 89% 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 N1 Cf North
The primary purpose of N1 Cf North 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 Horse Creek near Ona.
The dam stands 43 feet tall and stretches 11,140 feet across, creates a reservoir covering 218 acres, has a maximum storage capacity of 8,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1980, the structure is 46 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. An emergency action plan is in place for this dam. The most recent inspection on record was 01/23/2006. That was over 20 years ago.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Florida |
| County | Hardee |
| Nearest City | Ona |
| River/Stream | Horse Creek |
| Coordinates | 27.62460, -81.95570 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 40 ft |
| Dam Length | 11,140 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 8,500 acre-ft |
| Max Storage | 8,500 acre-ft |
| Normal Storage | 7,630 acre-ft |
| Surface Area | 218 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 20 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 01/23/2006 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL11058 |
| Federal ID | FL11058 |
| More Info | State Dam Safety Program |