Phosphoria P-1 is an earth dam located in Polk County, Florida. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall. 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 Phosphoria P-1
The primary purpose of Phosphoria P-1 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 Fort Meade.
The dam stands 11 feet tall, creates a reservoir covering 640 acres, and has a maximum storage capacity of 5,200 acre-feet.
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.
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Location
| State | Florida |
| County | Polk |
| Nearest City | Fort Meade |
| River/Stream | Alafia River |
| Coordinates | 27.81000, -81.91000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 8 ft |
Storage & Hydraulics
| NID Storage | 5,200 acre-ft |
| Max Storage | 5,200 acre-ft |
| Normal Storage | 4,480 acre-ft |
| Surface Area | 640 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 | FL00660 |
| Federal ID | FL00660 |
| More Info | State Dam Safety Program |