Structure 551
Structure 551 is a concrete dam located in Pinellas County, Florida, built in 1970. It carries a Low hazard potential classification.
About Structure 551
The primary purpose of Structure 551 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 C-531 (lake Tarpon Canal) near Oldsmar.
The dam stands 24 feet tall and stretches 250 feet across, creates a reservoir covering 2,534 acres, has a maximum storage capacity of 24,400 acre-feet, and collects water from a drainage area of 60 square miles. Completed in 1970, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 12/19/2024.
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Location
| State | Florida |
| County | Pinellas |
| Nearest City | Oldsmar |
| River/Stream | C-531 (lake Tarpon Canal) |
| Coordinates | 28.05000, -82.70000 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 24 ft |
| Dam Height | 8 ft |
| Dam Length | 250 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 24,400 acre-ft |
| Max Storage | 24,400 acre-ft |
| Normal Storage | 15,500 acre-ft |
| Surface Area | 2,534 acres |
| Drainage Area | 60 sq mi |
| Max Discharge | 6,000 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | SWFWMD |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 12/19/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL00168 |
| Federal ID | FL00168 |
| More Info | State Dam Safety Program |