Mosaic Csa F2d Reservoir Report

Last Updated: December 5, 2025

Mosaic Csa F2d, located in Hillsborough, Florida, is a privately owned earth dam primarily used for tailings storage.


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Summary

The dam stands at a height of 55 feet with a structural height of 57 feet and a hydraulic height of 50 feet. Completed in 1996, the dam has a storage capacity of 29,100 acre-feet and covers a surface area of 550 acres. Alderman Creek serves as the primary river or stream near the dam site, with a drainage area of 0.86 square miles.

This dam is regulated by the Florida Department of Environmental Protection (FDEP) and falls under the jurisdiction of the state, with permitting, inspection, and enforcement activities carried out by state agencies. The dam has a controlled spillway with a width of 128 feet and a maximum discharge capacity of 640 cubic feet per second. Despite being rated as having a significant hazard potential, the condition assessment of the dam is currently marked as 'Not Rated', and it has not been inspected since October 2010.

With a very high risk assessment rating of 1, Mosaic Csa F2d poses potential risks that warrant careful monitoring and management. The dam's risk management measures, emergency action plan status, and inundation maps are not readily available in the data provided, highlighting the importance of ensuring the safety and integrity of this essential water resource infrastructure in the face of changing climate conditions and water resource management challenges.

Year Completed

1996

Dam Length

14648

Dam Height

55

River Or Stream

ALDERMAN CREEK

Primary Dam Type

Earth

Surface Area

550

Hydraulic Height

50

Drainage Area

0.86

Nid Storage

29100

Structural Height

57

Hazard Potential

Significant

Nid Height

57
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Mosaic Csa F2dSOUTH PRONG ALAFIA RIVER NEAR FT LONESOME FL Preview South Prong Alafia River Near Ft Lonesome Fl
17.7cfs
18cfs
Mosaic Csa F2dLITTLE MANATEE RIVER NEAR FT. LONESOME FL Preview Little Manatee River Near Ft. Lonesome Fl
1.41cfs
1cfs
Mosaic Csa F2dSOUTH FORK LITTLE MANATEE RIVER NEAR PARRISH FL Preview South Fork Little Manatee River Near Parrish Fl
6.76cfs
7cfs
Mosaic Csa F2dSOUTH PRONG ALAFIA RIVER NEAR LITHIA FL Preview South Prong Alafia River Near Lithia Fl
25.9cfs
26cfs
Mosaic Csa F2dHORSE CREEK NEAR MYAKKA HEAD FL Preview Horse Creek Near Myakka Head Fl
2.59cfs
3cfs
Mosaic Csa F2dSOUTH FORK LITTLE MANATEE RIVER NEAR WIMAUMA FL Preview South Fork Little Manatee River Near Wimauma Fl
15.7cfs
16cfs

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.
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Nearby Reservoirs