F3a Four Corners Mine is an earth dam located in Manatee County, Florida, built in 2001. It carries a Significant hazard potential classification.
Dam profile
NID height · 68 ft68 ft tall and 19,866 ft long, taller than 96% 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 F3a Four Corners Mine
The primary purpose of F3a Four Corners Mine 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 Myakka River near Duette.
The dam stands 68 feet tall and stretches 19,866 feet across, creates a reservoir covering 571 acres, has a maximum storage capacity of 37,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2001, 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 01/23/2006. That was over 20 years ago.
At 68 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | Florida |
| County | Manatee |
| Nearest City | Duette |
| River/Stream | Myakka River |
| Coordinates | 27.63030, -82.07820 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 68 ft |
| Dam Height | 65 ft |
| Dam Length | 19,866 ft |
| Year Completed | 2001 (25 years old) |
Storage & Hydraulics
| NID Storage | 37,500 acre-ft |
| Max Storage | 37,500 acre-ft |
| Normal Storage | 34,260 acre-ft |
| Surface Area | 571 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 80 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 01/23/2006 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL11050 |
| Federal ID | FL11050 |
| More Info | State Dam Safety Program |