Kingsford K-4 is an earth dam located in Polk County, Florida, built in 1975. It carries a Significant hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 13,200 ft long. 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 Kingsford K-4
The primary purpose of Kingsford K-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 Alafia River near Mulberry.
The dam stands 20 feet tall and stretches 13,200 feet across, creates a reservoir covering 195 acres, and has a maximum storage capacity of 3,900 acre-feet. Completed in 1975, 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.
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Location
| State | Florida |
| County | Polk |
| Nearest City | Mulberry |
| River/Stream | Alafia River |
| Coordinates | 27.77821, -81.99468 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 13,200 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 3,900 acre-ft |
| Max Storage | 3,900 acre-ft |
| Normal Storage | 2,100 acre-ft |
| Surface Area | 195 acres |
| Max Discharge | 510 cfs |
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 | FL00657 |
| Federal ID | FL00657 |
| More Info | State Dam Safety Program |