Mosaic Csa Bf4 Reservoir Report

Last Updated: December 6, 2025

Mosaic Csa Bf4, also known as Mobil Big Four Bf4, is a privately owned earth dam located in Bradley Junction, Florida.


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Summary

Completed in 1991, this dam serves the primary purpose of managing tailings and has a significant hazard potential, with a very high risk assessment rating. The dam stands at a height of 40 feet, with a hydraulic height of 35 feet and a structural height of 42 feet, holding a maximum storage capacity of 17,500 acre-feet.

Situated along the Alafia River in Hillsborough County, Florida, Mosaic Csa Bf4 spans a length of 18,562 feet and covers a surface area of 438 acres. The dam features a controlled spillway with a width of 64 feet and has a maximum discharge of 320 cubic feet per second. Despite being state-regulated and subject to inspection, the dam's condition assessment is currently not rated, highlighting the need for ongoing monitoring and risk management measures to ensure its safety and integrity.

With its location in a high-risk area and its critical role in managing tailings, Mosaic Csa Bf4 serves as a vital water resource infrastructure in Florida. As climate change continues to impact the region, the importance of maintaining and enhancing the resilience of dams like Mosaic Csa Bf4 becomes increasingly apparent, underscoring the need for effective regulatory oversight and proactive risk management strategies to safeguard both the environment and surrounding communities.

Year Completed

1991

Dam Length

18562

Dam Height

40

River Or Stream

ALAFIA RIVER

Primary Dam Type

Earth

Surface Area

438

Hydraulic Height

35

Drainage Area

0.68

Nid Storage

17500

Structural Height

42

Hazard Potential

Significant

Nid Height

42
       
Seasonal Comparison

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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.