Mosaic Csa F2b is an earth dam located in Hillsborough, Florida, built in 1993. It carries a Significant hazard potential classification.
Dam profile
NID height · 57 ft57 ft tall and 14,500 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Mosaic Csa F2b
The primary purpose of Mosaic Csa F2b 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 Alderman Creek near Fort Lonesome.
The dam stands 57 feet tall and stretches 14,500 feet across, creates a reservoir covering 650 acres, has a maximum storage capacity of 34,500 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1993, the structure is 33 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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/20/2005. That was over 21 years ago.
At 57 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Fort Lonesome |
| River/Stream | Alderman Creek |
| Coordinates | 27.66070, -82.07300 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 57 ft |
| Dam Height | 55 ft |
| Dam Length | 14,500 ft |
| Year Completed | 1993 (33 years old) |
Storage & Hydraulics
| NID Storage | 34,500 acre-ft |
| Max Storage | 34,500 acre-ft |
| Normal Storage | 32,500 acre-ft |
| Surface Area | 650 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 640 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/20/2005 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL83462 |
| Federal ID | FL83462 |
| More Info | State Dam Safety Program |