Mulberry (11) Reservoir Report

Last Updated: December 5, 2025

Mulberry (11) is a private dam located in Polk, Florida, along the North Prong Alafia River.


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Summary

Standing at a height of 105 feet, with a dam length of 5755 feet, this earth-type structure serves the primary purpose of tailings containment. The dam has a storage capacity of 768 acre-feet, with a normal storage level of 538 acre-feet, covering a surface area of 38 acres. With a controlled spillway type and a maximum discharge rate of 110 cubic feet per second, Mulberry (11) poses a significant hazard potential due to its very high risk assessment rating.

Despite its significant hazard potential, Mulberry (11) has not been rated for its condition assessment and lacks an emergency action plan (EAP). The dam has not been inspected in recent years, and there is limited information on its risk management measures and preparedness for potential emergencies. The surrounding area is at risk of inundation, making it crucial for stakeholders and authorities to address the safety concerns associated with this dam and develop appropriate risk mitigation strategies.

Water resource and climate enthusiasts monitoring Mulberry (11) should be aware of its location, purpose, and potential risks. As a privately owned structure with state jurisdiction and regulation, there is a need for enhanced oversight and emergency preparedness measures to ensure the safety of downstream communities and the surrounding environment. Continued monitoring, inspection, and risk assessment are essential to prevent any potential disasters and protect the integrity of the North Prong Alafia River watershed.

Dam Length

5755

Dam Height

100

River Or Stream

NORTH PRONG ALAFIA RIVER

Primary Dam Type

Earth

Surface Area

38

Hydraulic Height

95

Drainage Area

0.06

Nid Storage

768

Structural Height

105

Hazard Potential

Significant

Nid Height

105
       
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.