G-81 is an earth dam located in St. Lucie County, Florida, built in 1953. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall and 125 ft long. 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 G-81
The primary purpose of G-81 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 Sfwmd (local government). It impounds the C-24 Canal near St Lucie.
The dam stands 22 feet tall and stretches 125 feet across, creates a reservoir covering 107 acres, has a maximum storage capacity of 800 acre-feet, and collects water from a drainage area of 50 square miles. Completed in 1953, 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. The most recent inspection on record was 07/10/1905. That was over 121 years ago.
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Location
| State | Florida |
| County | St. Lucie |
| Nearest City | St Lucie |
| River/Stream | C-24 Canal |
| Coordinates | 27.44780, -80.54640 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 18 ft |
| Dam Length | 125 ft |
| Year Completed | 1953 (73 years old) |
Storage & Hydraulics
| NID Storage | 800 acre-ft |
| Max Storage | 800 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 107 acres |
| Drainage Area | 50 sq mi |
| Max Discharge | 100 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Sfwmd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/10/1905 |
| Emergency Action Plan | No |
Identifiers
| NID ID | FL28004 |
| Federal ID | FL28004 |
| More Info | State Dam Safety Program |