Hopewell Csa-hl-4 is an earth dam located in Hillsborough, Florida, built in 2004. It carries a Significant hazard potential classification.
Dam profile
NID height · 39 ft39 ft tall and 16,000 ft long, taller than 85% 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-hl-4
The primary purpose of Hopewell Csa-hl-4 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 39 feet tall and stretches 16,000 feet across, creates a reservoir covering 360 acres, and has a maximum storage capacity of 12,500 acre-feet. Completed in 2004, 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 21 years ago.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Keysville |
| River/Stream | Alafia River |
| Coordinates | 27.91340, -82.10560 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 37 ft |
| Dam Length | 16,000 ft |
| Year Completed | 2004 (22 years old) |
Storage & Hydraulics
| NID Storage | 12,500 acre-ft |
| Max Storage | 12,500 acre-ft |
| Normal Storage | 11,520 acre-ft |
| Surface Area | 360 acres |
| 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 | FL11012 |
| Federal ID | FL11012 |
| More Info | State Dam Safety Program |