Temple Terrace (se) Gypstack is an earth dam located in Hillsborough, Florida, built in 1984. It carries a Significant hazard potential classification.
Dam profile
NID height · 65 ft65 ft tall and 8,110 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 Temple Terrace (se) Gypstack
The primary purpose of Temple Terrace (se) Gypstack 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 Hillsborough River near Zephyrhills.
The dam stands 65 feet tall and stretches 8,110 feet across, creates a reservoir covering 74 acres, has a maximum storage capacity of 3,900 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1984, the structure is 42 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 09/07/2005. That was over 21 years ago.
At 65 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Zephyrhills |
| River/Stream | Hillsborough River |
| Coordinates | 28.15010, -82.13310 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 65 ft |
| Dam Height | 60 ft |
| Dam Length | 8,110 ft |
| Year Completed | 1984 (42 years old) |
Storage & Hydraulics
| NID Storage | 3,900 acre-ft |
| Max Storage | 3,900 acre-ft |
| Normal Storage | 3,675 acre-ft |
| Surface Area | 74 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 64 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Tailings |
| Owner | The Mosaic Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/07/2005 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL10120 |
| Federal ID | FL10120 |
| More Info | State Dam Safety Program |