Rockland Mine S-4 is an earth dam located in Polk County, Florida, built in 1967. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 8,100 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 Rockland Mine S-4
The primary purpose of Rockland Mine S-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 Unnamed Pond near Fort Meade.
The dam stands 20 feet tall and stretches 8,100 feet across, creates a reservoir covering 92 acres, and has a maximum storage capacity of 1,659 acre-feet. Completed in 1967, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Florida |
| County | Polk |
| Nearest City | Fort Meade |
| River/Stream | Unnamed Pond |
| Coordinates | 27.74000, -81.86000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 8,100 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 1,659 acre-ft |
| Max Storage | 1,659 acre-ft |
| Normal Storage | 1,659 acre-ft |
| Surface Area | 92 acres |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | FL00225 |
| Federal ID | FL00225 |
| More Info | State Dam Safety Program |