Phosphoria P-5 is an earth dam located in Polk County, Florida, built in 1992. It carries a Significant hazard potential classification.
Dam profile
NID height · 54 ft54 ft tall and 18,900 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Phosphoria P-5
The primary purpose of Phosphoria P-5 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 Alafia River near Homeland.
The dam stands 54 feet tall and stretches 18,900 feet across, creates a reservoir covering 542 acres, has a maximum storage capacity of 26,000 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1992, the structure is 34 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.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Florida |
| County | Polk |
| Nearest City | Homeland |
| River/Stream | Alafia River |
| Coordinates | 27.82280, -81.91550 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 50 ft |
| Dam Length | 18,900 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 26,000 acre-ft |
| Max Storage | 26,000 acre-ft |
| Normal Storage | 24,390 acre-ft |
| Surface Area | 542 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 100 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL11071 |
| Federal ID | FL11071 |
| More Info | State Dam Safety Program |