G-81 Reservoir Report
Nearby: S-99 Capron Trail #1
Last Updated: December 16, 2025
G-81, also known as the Orange Avenue Control Structure, is a state-owned dam located in St.
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Summary
Lucie, Florida, along the C-24 Canal. Completed in 1953, this earth dam stands at a height of 18 feet and serves the primary purpose of flood risk reduction. The dam has a storage capacity of 800 acre-feet and a drainage area of 50 square miles, with a maximum discharge of 100 cubic feet per second. Despite being classified as having a low hazard potential, it is deemed to have a very high risk due to its location and potential impact on surrounding areas.
Managed by the South Florida Water Management District (SFWMD), G-81 is regulated by the Florida Department of Environmental Protection (FDEP) and undergoes state permitting, inspection, and enforcement processes. The dam's spillway type is controlled, and it has a structural height of 22 feet with a hydraulic height of 16 feet. While the dam's condition is currently not rated, it is crucial for flood control in the region and is closely monitored for any potential risks or issues that may arise. With a history dating back to over half a century, G-81 remains a vital piece of infrastructure in managing water resources in the area and mitigating flood risks for the local community.
Year Completed |
1953 |
Dam Length |
125 |
Dam Height |
18 |
River Or Stream |
C-24 CANAL |
Primary Dam Type |
Earth |
Surface Area |
107 |
Hydraulic Height |
16 |
Drainage Area |
50 |
Nid Storage |
800 |
Structural Height |
22 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
G-81