F1 Four Corners Mine Reservoir Report
Nearby: F3b Four Corners Mine Mosaic Csa F2d
Last Updated: December 5, 2025
The F1 Four Corners Mine in Florida is a privately owned mine with a primary purpose of tailings storage.
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Summary
The mine features an earth dam with a height of 55 feet and a hydraulic height of 50 feet, completed in 1989. It is located in Manatee County, near the Myakka River, and is regulated by the Florida Department of Environmental Protection (FDEP).
With a storage capacity of 17,500 acre-feet and a surface area of 322 acres, the F1 Four Corners Mine poses a significant hazard potential and is classified as having a very high risk level. Despite not being rated for its condition, the mine is equipped with a controlled spillway and has a maximum discharge capacity of 80 cubic feet per second. The last inspection was conducted in January 2006, and the mine is subject to state regulatory oversight, inspection, and enforcement.
Water resource and climate enthusiasts interested in the intersection of mining operations and environmental regulations in Florida would find the F1 Four Corners Mine to be a captivating case study. Its location near the Myakka River and its significant hazard potential underscore the importance of proper management and oversight of such facilities to protect water resources and mitigate climate-related risks in the region.
Year Completed |
1989 |
Dam Length |
14160 |
Dam Height |
55 |
River Or Stream |
MYAKKA RIVER |
Primary Dam Type |
Earth |
Surface Area |
322 |
Hydraulic Height |
50 |
Drainage Area |
0.5 |
Nid Storage |
17500 |
Structural Height |
58 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
58 |
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.
F1 Four Corners Mine