G-119 Reservoir Report

Nearby: S-338 S-121

Last Updated: December 5, 2025

G-119, also known as Trail Glades Culvert, is a state-owned water resource structure located in Miami-Dade, Florida.


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Summary

Completed in 1966, this earth dam serves the primary purpose of water supply, with a storage capacity of 40,000 acre-feet and a surface area of 78 acres. The dam spans 120 feet in length and stands at a height of 22 feet, with a controlled spillway width of 12 feet.

Managed by the South Florida Water Management District (SFWMD), G-119 plays a critical role in regulating water levels in the TAMIAMI CANAL (C4) for irrigation and other water supply needs in the region. Despite being classified with a low hazard potential, G-119 is deemed to have a very high risk due to its age and condition assessment being labeled as "Not Rated." The last inspection date recorded was in 1905, indicating a need for updated assessments and potential risk management measures to ensure the structure's continued functionality and safety.

As climate change and increasing water demands pose challenges to water resource management, G-119 stands as a key infrastructure supporting water supply in the region. With state regulation, inspection, and enforcement in place, there is a need for ongoing monitoring and potentially upgrades to address the high-risk status and ensure the continued resilience of this important water resource structure in Florida.

Year Completed

1966

Dam Length

120

Dam Height

14

River Or Stream

TAMIAMI CANAL (C4)

Primary Dam Type

Earth

Surface Area

78

Hydraulic Height

7

Drainage Area

30

Nid Storage

40000

Structural Height

22

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

22
       
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.