G-86s Reservoir Report

Nearby: S-30 G-87

Last Updated: December 5, 2025

G-86s, also known as Wca 3a Drainage, is a state-owned structure located in Broward County, Florida.


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Summary

Completed in 1993, this earth dam serves the primary purpose of flood risk reduction along the C-11 Canal. With a dam height of 12 feet and a hydraulic height of 11 feet, G-86s has a storage capacity of 320 acre-feet and a normal storage capacity of 240 acre-feet, covering a surface area of 47 acres.

Managed by the South Florida Water Management District (SFWMD), G-86s has a controlled spillway with a width of 5 feet and is equipped with valve outlet gates. Despite being rated as having a low hazard potential and not yet assessed for condition, the structure poses a very high risk due to its critical role in managing water flow in the area. With state-regulated permitting, inspection, and enforcement in place, G-86s plays a crucial role in mitigating flood risks and protecting the surrounding communities in Weston.

Located within the jurisdiction of FDEP, G-86s is a key component in the flood risk reduction strategy in Broward County. As climate change continues to impact water resources in Florida, structures like G-86s are essential for maintaining resilient and sustainable water management systems in the region. For water resource and climate enthusiasts, G-86s serves as a fascinating example of how infrastructure plays a vital role in adapting to and mitigating the effects of a changing climate on water resources.

Year Completed

1993

Dam Length

100

Dam Height

12

River Or Stream

C-11 CANAL

Primary Dam Type

Earth

Surface Area

47

Hydraulic Height

11

Drainage Area

4

Nid Storage

320

Structural Height

15

Outlet Gates

Valve

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

15
       
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.