Mosaic Csa F5
Mosaic Csa F5 is an earth dam located in Hillsborough, Florida, built in 2005. It carries a Significant hazard potential classification.
About Mosaic Csa F5
The primary purpose of Mosaic Csa F5 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 Long Branch near Fort Lonesome.
The dam stands 62 feet tall and stretches 14,750 feet across, creates a reservoir covering 640 acres, has a maximum storage capacity of 37,100 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2005, the structure is relatively new.
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 20 years ago.
At 62 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Fort Lonesome |
| River/Stream | Long Branch |
| Coordinates | 27.66000, -82.14000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 62 ft |
| Dam Height | 60 ft |
| Dam Length | 14,750 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 37,100 acre-ft |
| Max Storage | 37,100 acre-ft |
| Normal Storage | 35,200 acre-ft |
| Surface Area | 640 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 640 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Tailings |
| Owner | THE MOSAIC COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 07/20/2005 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL11023 |
| Federal ID | FL11023 |
| More Info | State Dam Safety Program |