S-60 Reservoir Report

Nearby: S-63 S-58

Last Updated: December 5, 2025

S-60, located in Osceola, Florida, is a state-regulated Earth dam completed in 1966 for the primary purpose of Flood Risk Reduction on Alligator Lake.


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Summary

Standing at a height of 23 feet, with a structural height of 16 feet and a length of 97 feet, S-60 has a storage capacity of 73,000 acre-feet and a normal storage capacity of 43,000 acre-feet. With a significant hazard potential, the dam's condition was last assessed as satisfactory in August 2014.

Despite being owned and regulated by the state of Florida, S-60 falls under the jurisdiction of the Jacksonville District of the US Army Corps of Engineers. The dam is situated in St. Cloud and serves as a crucial structure for managing flood risks in the region. With a maximum discharge capacity of 450 cubic feet per second, S-60 plays a vital role in protecting the surrounding area from potential inundation. While the last inspection dates back to 1905, the dam's condition remains satisfactory as per the latest assessment in 2014.

Overall, S-60 is a key component of the flood risk reduction infrastructure in Osceola, Florida. As a state-regulated Earth dam, it provides essential protection for Alligator Lake and the surrounding areas from potential flooding events. With a significant hazard potential, the dam's satisfactory condition and adequate storage capacity highlight its importance in safeguarding the local community from water-related risks.

Year Completed

1966

Dam Length

97

Dam Height

23

River Or Stream

ALLIGATOR LAKE

Primary Dam Type

Earth

Surface Area

18627

Hydraulic Height

23

Nid Storage

73000

Structural Height

16

Hazard Potential

Significant

Nid Height

23
       
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.