Mosaic Csa F2a Reservoir Report
Nearby: Mosaic Csa F2d Mosaic Csa F2b
Last Updated: December 25, 2025
Mosaic Csa F2a, located in Fort Lonesome, Hillsborough, Florida, is a privately-owned earth dam with a primary purpose of storing tailings.
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Summary
Constructed in 1986, this dam stands at a height of 40 feet and has a hydraulic height of 35 feet, with a structural height of 42 feet. It has a storage capacity of 33,100 acre-feet and covers a surface area of 650 acres, serving as a critical structure for managing water resources in the area.
The dam is regulated by the Mine Safety and Health Administration, with state oversight from the Florida Department of Environmental Protection. Despite being classified as having a significant hazard potential, the condition assessment is listed as "Not Rated." The last inspection was conducted in 2005, highlighting the need for ongoing monitoring and maintenance to ensure the safety and integrity of the structure. With a very high risk rating and a controlled spillway system in place, the Mosaic Csa F2a dam plays a crucial role in water management and climate resilience efforts in the region.
As an integral part of the Alderman Creek watershed, Mosaic Csa F2a is vital for flood control, water storage, and environmental protection in the area. The dam's strategic location and design features make it a key asset for mitigating the impacts of climate change and ensuring sustainable water resource management in Hillsborough County. With proper oversight and maintenance, this structure will continue to play a crucial role in safeguarding the community against potential hazards and supporting the region's water supply needs for years to come.
Year Completed |
1986 |
Dam Length |
12500 |
Dam Height |
40 |
River Or Stream |
ALDERMAN CREEK |
Primary Dam Type |
Earth |
Surface Area |
650 |
Hydraulic Height |
35 |
Drainage Area |
1.02 |
Nid Storage |
33100 |
Structural Height |
42 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
42 |
Seasonal Comparison
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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.
Mosaic Csa F2a