Hil21
Hil21 is an earth dam located in Hillsborough, Florida. It carries a Undetermined hazard potential classification.
About Hil21
The primary purpose of Hil21 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 Plant City.
The dam stands 51 feet tall and stretches 18,842 feet across, creates a reservoir covering 497 acres, and has a maximum storage capacity of 29,947 acre-feet.
At 51 feet, this dam is taller than 93% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Plant City |
| River/Stream | Unnamed Pond |
| Coordinates | 27.70766, -82.13407 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 51 ft |
| Dam Height | 51 ft |
| Dam Length | 18,842 ft |
Storage & Hydraulics
| NID Storage | 29,947 acre-ft |
| Max Storage | 29,947 acre-ft |
| Normal Storage | 4,673 acre-ft |
| Surface Area | 497 acres |
Ownership & Safety
| Purpose | Tailings |
| Owner | THE MOSAIC COMPANY |
| Owner Type | Private |
| Hazard Classification | Undetermined |
| Condition Assessment | Not Rated |
| Emergency Action Plan | No |
Identifiers
| NID ID | FL12019 |
| Federal ID | FL12019 |
| More Info | State Dam Safety Program |