H-1 Settling Area
H-1 Settling Area is an earth dam located in Polk County, Florida, built in 1976. It carries a Significant hazard potential classification.
About H-1 Settling Area
The primary purpose of H-1 Settling Area 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 Brewster.
The dam stands 34 feet tall and stretches 15,000 feet across, creates a reservoir covering 387 acres, and has a maximum storage capacity of 13,160 acre-feet. Completed in 1976, the structure is 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.
At 34 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Florida |
| County | Polk |
| Nearest City | Brewster |
| River/Stream | Alafia River |
| Coordinates | 27.78000, -81.93000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 15,000 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 13,160 acre-ft |
| Max Storage | 13,160 acre-ft |
| Normal Storage | 1,500 acre-ft |
| Surface Area | 387 acres |
| Max Discharge | 1,004 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | THE MOSAIC COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Emergency Action Plan | No |
Identifiers
| NID ID | FL00633 |
| Federal ID | FL00633 |
| More Info | State Dam Safety Program |