S-155 Reservoir Report

Last Updated: December 5, 2025

S-155, also known as the West Palm Beach Lock and Dam, is a state-owned structure located in Palm Beach, Florida, along the C-51 Canal.


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Summary

This dam serves the primary purpose of flood risk reduction in the area, with a significant hazard potential. Standing at a height of 21 feet, it provides storage of up to 7,000 acre-feet of water, with a normal storage capacity of 6,160 acre-feet.

Managed by the state of Florida, S-155 is regulated, permitted, inspected, and enforced by state authorities to ensure its structural integrity and functionality. Despite its critical role in flood risk reduction, the condition assessment of this dam is currently labeled as "Not Rated", highlighting the need for further evaluation and potential maintenance. With a notable hydraulic height of 14 feet and a surface area of 440 acres, S-155 plays a crucial role in water resource management and climate resilience efforts in the region.

Located in West Palm Beach and under the jurisdiction of the Jacksonville District, this dam is a key infrastructure asset in the area, overseen by state agencies and officials. As climate change continues to pose challenges in terms of water management and extreme weather events, the maintenance and monitoring of structures like S-155 become increasingly vital in safeguarding communities and mitigating flood risks.

Dam Height

18

River Or Stream

C-51 CANAL

Primary Dam Type

Other

Surface Area

440

Hydraulic Height

14

Nid Storage

7000

Structural Height

21

Hazard Potential

Significant

Nid Height

21
       
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.