Hil21 Reservoir Report

Nearby: Hil19 Area A

Last Updated: December 5, 2025

Located in Plant City, Florida, the Hil21 dam stands at a height of 50.89 feet and serves the primary purpose of tailings management.


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Summary

Built on an unnamed pond, this private-owned earth dam has a storage capacity of 29,947.39 acre-feet and covers a surface area of 497 acres. Although its hazard potential is currently undetermined and its condition is not rated, the dam is regulated by the Florida Department of Environmental Protection, with state permitting, inspection, and enforcement in place.

Despite lacking certain details such as the year of completion and inspection frequency, the Hil21 dam remains a significant infrastructure in Hillsborough County, Florida. With a normal storage capacity of 4,673.38 acre-feet, the dam plays a crucial role in managing water resources in the area. The dam's location in a strategic position in the watershed ensures effective control over water flow and storage, contributing to the overall water management efforts in the region.

As water resource and climate enthusiasts continue to monitor and assess the impact of dams like Hil21 on the environment, it is important to stay updated on the regulatory measures in place and the potential risks associated with such structures. With a focus on safety and sustainable water management practices, ongoing evaluation of dam conditions, emergency preparedness, and risk assessment are crucial to ensuring the resilience of water infrastructure in the face of changing climate patterns and increasing water demands.

Dam Length

18842

Dam Height

50.89

River Or Stream

UNNAMED POND

Primary Dam Type

Earth

Surface Area

497

Nid Storage

29947.39

Hazard Potential

Undetermined

Nid Height

51
       
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.