Clay Settling Area Al is an earth dam located in Hillsborough, Florida, built in 1976. It carries a Low hazard potential classification.
Dam profile
NID height · 27 ft27 ft tall and 10,500 ft long, taller than 59% of U.S. dams with a recorded height. 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 Clay Settling Area Al
The primary purpose of Clay Settling Area Al 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 South Prong Alafia River near Fish Hawk.
The dam stands 27 feet tall and stretches 10,500 feet across, creates a reservoir covering 222 acres, and has a maximum storage capacity of 6,000 acre-feet. Completed in 1976, the structure is 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 | Hillsborough |
| Nearest City | Fish Hawk |
| River/Stream | South Prong Alafia River |
| Coordinates | 27.76000, -82.10000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 10,500 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 6,000 acre-ft |
| Max Storage | 6,000 acre-ft |
| Normal Storage | 5,854 acre-ft |
| Surface Area | 222 acres |
| Max Discharge | 148 cfs |
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 | FL00611 |
| Federal ID | FL00611 |
| More Info | State Dam Safety Program |