G-56 Reservoir Report

Nearby: G-65 S-40

Last Updated: December 5, 2025

G-56, located in Broward County, Florida, is a state-regulated dam with a low hazard potential and a very high risk assessment rating.


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Summary

Built in 1920 and owned by the state, this dam on the Hillsboro Canal serves a primary purpose classified as "Other." It stands at a structural height of 37 feet, with a hydraulic height of 19 feet and a length of 125 feet.

With a maximum storage capacity of 2100 acre-feet and a normal storage capacity of 1405 acre-feet, G-56 has a surface area of 200 acres and drains an area of 75 square miles. The dam has a controlled spillway with a width of 20 feet and a maximum discharge rate of 1600 cubic feet per second. While the dam is currently rated as "Not Rated" in terms of its condition assessment, it undergoes regular state inspections, permitting, and enforcement to ensure its safety and functionality.

Climate and water resource enthusiasts would be intrigued by G-56's unique design and historical significance, as well as its critical role in managing water flow in the region. The dam's location in the Boca Raton Delimited Area and its association with the Jacksonville District of the US Army Corps of Engineers add to its importance in the local ecosystem. Despite its low hazard potential, the very high risk assessment underscores the need for ongoing risk management measures and emergency preparedness to safeguard the surrounding communities and water resources.

Year Completed

1920

Dam Length

125

Dam Height

35

River Or Stream

HILLSBORO CANAL

Primary Dam Type

Other

Surface Area

200

Hydraulic Height

19

Drainage Area

75

Nid Storage

2100

Structural Height

37

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

37
       
Seasonal Comparison

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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.