G-90
G-90 is a concrete dam located in Highlands County, Florida, built in 1962. It carries a High hazard potential classification and has a fair condition assessment.
About G-90
The primary purpose of G-90 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 Jack Creek near Leisure Lakes.
The dam stands 15 feet tall and stretches 21 feet across, creates a reservoir covering 3,662 acres, has a maximum storage capacity of 44,676 acre-feet, and collects water from a drainage area of 44 square miles. Completed in 1962, the structure is well into its service life at over 50 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 11/20/2024.
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 | Highlands |
| Nearest City | Leisure Lakes |
| River/Stream | Jack Creek |
| Coordinates | 27.34000, -81.41000 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 15 ft |
| Dam Height | 13 ft |
| Dam Length | 21.7 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 44,676 acre-ft |
| Max Storage | 44,676 acre-ft |
| Normal Storage | 33,324 acre-ft |
| Surface Area | 3,662 acres |
| Drainage Area | 44 sq mi |
| Max Discharge | 727 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | SWFWMD |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 11/20/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | FL00440 |
| Federal ID | FL00440 |
| More Info | State Dam Safety Program |