Lake Seminole Dam Reservoir Report

Last Updated: December 5, 2025

Lake Seminole Dam, also known as Long Bayou Dam, is a local government-owned structure located in Pinellas County, Florida.


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Summary

Completed in 1949, this earth dam stands at a height of 15 feet and spans a length of 2000 feet along the Long Bayou river. With a primary purpose of recreation, the dam offers a surface area of 320 acres and a storage capacity of 4800 acre-feet, making it a popular destination for water resource and climate enthusiasts seeking outdoor activities.

Managed by the Jacksonville District of the US Army Corps of Engineers, Lake Seminole Dam is regulated by the state of Florida and undergoes regular inspections and enforcement to ensure its structural integrity and safety. Despite being classified as low hazard potential, the dam's condition is currently not rated, indicating a need for further assessment. Emergency action plans are yet to be prepared, highlighting the importance of ongoing risk management measures and guidelines to be implemented in case of potential inundation events.

With its tranquil waters and recreational offerings, Lake Seminole Dam serves as a vital resource for the community and a picturesque backdrop for outdoor enthusiasts. As efforts continue to monitor and maintain the dam's safety, it remains a cherished destination for those seeking to connect with nature and enjoy the benefits of this essential water resource in the heart of Florida's Pinellas County.

Year Completed

1949

Dam Length

2000

Dam Height

15

River Or Stream

LONG BAYOU

Primary Dam Type

Earth

Surface Area

320

Hydraulic Height

15

Nid Storage

4800

Structural Height

11

Hazard Potential

Low

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.