S-11 Reservoir Report

Last Updated: December 5, 2025

S-11, a state-regulated dam located in Webster, Florida, serves as a crucial water supply infrastructure.


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Summary

Completed in 1965, this dam stands at 19.5 feet tall with a hydraulic height of 12.7 feet and a dam length of 64 feet. With a storage capacity of 1250 acre-feet, it plays a vital role in flood risk reduction and water supply management in the area.

The dam's hazard potential is deemed significant, although its condition assessment is currently not rated. Despite its last inspection date dating back to 1999, S-11 continues to be state-permitted, inspected, and enforced to ensure its structural integrity and operational efficiency. The dam's location on Canal C in Sumter County, Florida, highlights its importance in the region's water resource management and underscores its critical role in safeguarding against potential flooding events.

Although lacking recent data on risk assessment and emergency action plan preparedness, S-11 remains a key infrastructure piece in Florida's water resource management portfolio. With its storage capacity, hydraulic height, and flood risk reduction capabilities, this dam stands as a testament to the state's commitment to ensuring a sustainable and reliable water supply for its residents. As climate change continues to impact water resources, the state's regulatory agencies, such as SWFWMD, play a vital role in overseeing the operation and maintenance of crucial structures like S-11 to safeguard against potential risks and ensure long-term water security for the region.

Year Completed

1965

Dam Length

64

Dam Height

9.2

River Or Stream

CANAL C

Primary Dam Type

Other

Surface Area

93

Hydraulic Height

12.7

Drainage Area

20

Nid Storage

1250

Structural Height

19.5

Hazard Potential

Significant

Nid Height

20
       
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.