Hil18 Reservoir Report

Last Updated: December 5, 2025

Hil18 is a privately owned dam located in Plant City, Florida, specifically in Hillsborough County.


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Summary

The dam is regulated by the Florida Department of Environmental Protection (FDEP) and holds a state permit for operation, inspection, and enforcement. The primary purpose of Hil18 is for tailings storage, and it is classified as an earth dam with a height of 12.14 feet and a storage capacity of 3292.56 acre-feet.

This dam, situated near an unnamed pond, has a surface area of 67 acres and a normal storage capacity of 897.93 acre-feet. While the hazard potential is currently undetermined and the condition assessment is listed as "Not Rated," the dam has not undergone a recent inspection and lacks an emergency action plan. The risk assessment, emergency contacts, and inundation maps are also not up to date, indicating a potential need for increased monitoring and management measures to ensure the safety and integrity of the structure.

With its location in a pristine natural setting and the potential risks associated with its operation, Hil18 presents an intriguing case study for water resource and climate enthusiasts. The dam's history, purpose, design, and regulatory oversight provide a rich tapestry for further exploration and analysis in the context of water resource management and climate resilience efforts in the region.

Dam Length

13675

Dam Height

12.14

River Or Stream

UNNAMED POND

Primary Dam Type

Earth

Surface Area

67

Nid Storage

3292.56

Hazard Potential

Undetermined

Nid Height

12
       
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.