P-11 Reservoir Report

Last Updated: December 5, 2025

P-11, also known as Lake Hancock, is a concrete dam located in Bartow, Florida, with a primary purpose of flood risk reduction.


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Summary

Completed in 1965, this dam stands at 2.7 feet tall with a hydraulic height of 9.6 feet and a length of 110 feet. It has a normal storage capacity of 44,048 acre-feet and a maximum discharge of 1,100 cubic feet per second. The dam is situated on Saddle Creek, within the jurisdiction of the Southwest Florida Water Management District, and is regulated, permitted, inspected, and enforced by the state agency SWFWMD.

With a surface area of 4,541 acres and a drainage area of 131 square miles, P-11 has a significant hazard potential and is classified as very high risk. Despite not having a condition assessment rating, the dam's risk level is closely monitored, with emergency action plans in place and regular inspections conducted. It serves as a crucial infrastructure for managing water resources and mitigating flood risks in the region. For water resource and climate enthusiasts, P-11 provides a fascinating case study in dam engineering and the intersection of water management and environmental stewardship in Florida's water-rich landscape.

Year Completed

1965

Dam Length

110

Dam Height

2.7

River Or Stream

SADDLE CREEK

Primary Dam Type

Concrete

Surface Area

4541

Hydraulic Height

9.6

Drainage Area

131

Nid Storage

44048

Outlet Gates

Other Controlled

Hazard Potential

Significant

Nid Height

10
       
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.