Hopewell Csa-hl1 is an earth dam located in Hillsborough, Florida, built in 1982. It carries a Significant hazard potential classification.
Dam profile
NID height · 37 ft37 ft tall and 16,275 ft long, taller than 83% 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 Hopewell Csa-hl1
The primary purpose of Hopewell Csa-hl1 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 Alafia River near Keysville.
The dam stands 37 feet tall and stretches 16,275 feet across, creates a reservoir covering 388 acres, has a maximum storage capacity of 12,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1982, the structure is 44 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 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Keysville |
| River/Stream | Alafia River |
| Coordinates | 27.91000, -82.12000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 35 ft |
| Dam Length | 16,275 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 12,500 acre-ft |
| Max Storage | 12,500 acre-ft |
| Normal Storage | 11,640 acre-ft |
| Surface Area | 388 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 160 cfs |
| Spillway Type | Controlled |
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 | FL11010 |
| Federal ID | FL11010 |
| More Info | State Dam Safety Program |