N-4 Rockland Mine Reservoir Report
Nearby: Rockland Mine N-3 Usac N4n
Last Updated: December 5, 2025
N-4 Rockland Mine in Polk, Florida, is a privately owned tailings dam situated along an unnamed creek in the Fort Meade area.
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Summary
With a significant hazard potential and a structural height of 45 feet, this earth dam has a hydraulic height of 35 feet and a NID storage capacity of 17,000 acre-feet. The dam covers a surface area of 440 acres and serves the primary purpose of storing tailings.
Despite being regulated by the state and meeting inspection, permitting, and enforcement requirements, the dam's condition assessment is currently listed as "Not Rated." However, with a normal storage capacity of 15,400 acre-feet and a maximum storage capacity of 17,000 acre-feet, the dam plays a crucial role in managing water resources in the area. The N-4 Rockland Mine dam presents an intriguing case study for water resource and climate enthusiasts interested in the intersection of mining activities, dam construction, and environmental management.
As a key component of the water infrastructure in the region, the N-4 Rockland Mine dam's risk management measures, emergency preparedness, and maintenance protocols are essential factors to monitor for ensuring the safety and sustainability of the surrounding ecosystem. With its location in a sensitive environmental area and the potential impact on the local community, the ongoing monitoring and assessment of the dam's integrity are crucial for maintaining water security and climate resilience in the face of changing environmental conditions.
Dam Height |
40 |
River Or Stream |
UNNAMED CREEK |
Primary Dam Type |
Earth |
Surface Area |
440 |
Hydraulic Height |
35 |
Nid Storage |
17000 |
Structural Height |
45 |
Hazard Potential |
Significant |
Nid Height |
45 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
N-4 Rockland Mine