G93 Control Structure Reservoir Report

Nearby: S-25b S-25

Last Updated: December 4, 2025

The G93 Control Structure, also known as the Coral Gables Control Structure, is a critical flood risk reduction infrastructure located in Miami-Dade, Florida.


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Summary

Owned by the state, this concrete dam stands at a height of 10 feet and has a hydraulic height of 8 feet, serving the primary purpose of flood risk reduction along the C-3 Canal. Completed in 1953 by the USACE, this structure has a normal storage capacity of 200 acre-feet and a maximum discharge of 640 cubic feet per second, with a controlled spillway width of 20 feet.

With a high hazard potential and a satisfactory condition assessment, the G93 Control Structure plays a vital role in managing flood risks in the area. The structure is regulated, inspected, and enforced by the Florida Department of Environmental Protection (FDEP), ensuring its functionality and safety. Despite its age, the G93 Control Structure continues to effectively mitigate flood risks in the region, showcasing the importance of well-maintained water resource infrastructure in addressing climate-related challenges. For water resource and climate enthusiasts, the G93 Control Structure serves as a noteworthy example of how strategic infrastructure design and management can help safeguard communities from the impacts of extreme weather events.

Year Completed

1953

Dam Length

150

Dam Height

10

River Or Stream

C-3 CANAL

Primary Dam Type

Concrete

Surface Area

34

Hydraulic Height

8

Drainage Area

25

Nid Storage

280

Structural Height

12

Outlet Gates

Uncontrolled

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

12
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.