S-155/l-112
S-155/l-112 is a concrete dam located in Hillsborough, Florida, built in 1981. It carries a High hazard potential classification.
About S-155/l-112
The primary purpose of S-155/l-112 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Swfwmd (local government). It impounds the Hillsborough River near Temple Terrace.
The dam stands 66 feet tall and stretches 24,000 feet across, creates a reservoir covering 116 acres, has a maximum storage capacity of 6,000 acre-feet, and collects water from a drainage area of 452 square miles. Completed in 1981, the structure is 45 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 12/05/2024.
At 66 feet, this dam is taller than 96% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Florida dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Florida |
| County | Hillsborough |
| Nearest City | Temple Terrace |
| River/Stream | Hillsborough River |
| Coordinates | 28.08838, -82.35172 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 66 ft |
| Dam Height | 43 ft |
| Dam Length | 24,000 ft |
| Year Completed | 1981 (45 years old) |
Storage & Hydraulics
| NID Storage | 6,000 acre-ft |
| Max Storage | 6,000 acre-ft |
| Normal Storage | 4,698 acre-ft |
| Surface Area | 116 acres |
| Drainage Area | 452 sq mi |
| Max Discharge | 8,000 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | SWFWMD |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Last Inspection | 12/05/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL12000 |
| Federal ID | FL12000 |
| More Info | State Dam Safety Program |