Swfwmd Lake Tarpon Control Structure (S-551) Reservoir Report

Last Updated: December 5, 2025

The Swfwmd Lake Tarpon Control Structure (S-551), also known as Pin7, is a state-owned facility located in Oldsmar, Florida, designed to manage water levels in Lake Tarpon.


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Summary

This structure plays a crucial role in flood risk reduction, as well as providing support for recreation and water supply purposes. With a low hazard potential and fair condition assessment, the facility is equipped with a controlled spillway and slide gates for efficient water flow management.

Constructed as an earth dam with stone core types and rock and soil foundations, the Swfwmd Lake Tarpon Control Structure stands at a height of 16 feet with a hydraulic height of 13 feet. The facility has a maximum storage capacity of 24,447 acre-feet, with a normal storage capacity of 7,756 acre-feet. The structure covers a surface area of 2,529 acres and has a spillway width of 80 feet, ensuring effective water discharge during peak periods.

Despite its high risk assessment due to its critical role in flood risk reduction, the Swfwmd Lake Tarpon Control Structure is well-maintained and regularly inspected by the Florida Department of Environmental Protection. With a dedicated emergency action plan in place and a reliable risk management strategy, this facility remains a key asset in the management of water resources and climate-related challenges in the region.

Dam Length

255

Dam Height

16

River Or Stream

LAKE TARPON

Primary Dam Type

Earth

Surface Area

2529

Hydraulic Height

13

Nid Storage

24447

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

16
       
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.