Swfwmd P-1 (Lake Lena) Water Conservation Structure Reservoir Report

Last Updated: December 5, 2025

Swfwmd P-1, also known as Lake Lena Water Conservation Structure, is a state-owned dam located in Polk County, Florida, designed for flood risk reduction along Lake Hancock and Saddle Creek.


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Summary

This Earth-type dam stands at a height of 8 feet with a hydraulic height of 5 feet, providing a maximum storage capacity of 3420 acre-feet and a normal storage volume of 222 acre-feet. The dam's controlled spillway, with a width of 24 feet, helps manage water levels during heavy rainfall events.

Despite its fair condition assessment as of 2016, the structure poses a high hazard potential due to its location and purpose. The risk assessment ranks it as very high, highlighting the importance of regular inspections and maintenance to ensure its continued functionality and safety. The dam's primary purpose extends beyond flood risk reduction to include recreation and water supply for the surrounding area, making it a crucial component of water resource management in the region. Overall, Swfwmd P-1 plays a key role in managing water resources in Polk County and protecting the local community from potential flooding events.

Dam Length

35

Dam Height

8

River Or Stream

LAKE HANCOCK/SADDLE CREEK

Primary Dam Type

Earth

Surface Area

206

Hydraulic Height

5

Nid Storage

3420

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

8
       
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.