Mosaic Csa F5 Reservoir Report
Nearby: Mosaic Csa F4a
Last Updated: December 5, 2025
Mosaic Csa F5 is a privately owned dam located in Hillsborough, Florida, specifically in the city of FORT LONESOME.
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Summary
Built in 2005, this earth dam stands at a height of 60 feet and has a hydraulic height of 55 feet, with a total structural height of 62 feet. It serves the primary purpose of storing tailings, with a maximum storage capacity of 37,100 acre-feet and a normal storage capacity of 35,200 acre-feet. The dam spans a length of 14,750 feet and covers a surface area of 640 acres.
This dam poses a significant hazard potential and is classified as having a very high risk, with a risk assessment rating of 1. While the condition assessment is listed as "Not Rated," the dam is regulated by the Florida Department of Environmental Protection (FDEP), and is subject to state jurisdiction, permitting, inspection, and enforcement. The dam features a controlled spillway with a width of 128 feet, and is situated on the LONG BRANCH river or stream within the Jacksonville District of the US Army Corps of Engineers.
Despite its risk level, Mosaic Csa F5 has not been assigned an Emergency Action Plan (EAP) or undergone a condition assessment. The dam has not been modified since its completion in 2005 and does not have any associated structures or outlet gates. The surrounding area has a drainage area of 1 square mile, and the dam has the capacity to discharge a maximum of 640 cubic feet per second. With its unique features and regulatory oversight, Mosaic Csa F5 stands as a crucial infrastructure for water resource management in the region.
Year Completed |
2005 |
Dam Length |
14750 |
Dam Height |
60 |
River Or Stream |
LONG BRANCH |
Primary Dam Type |
Earth |
Surface Area |
640 |
Hydraulic Height |
55 |
Drainage Area |
1 |
Nid Storage |
37100 |
Structural Height |
62 |
Hazard Potential |
Significant |
Nid Height |
62 |
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 F4b