Thomas J Holbrook Dam Reservoir Report
Nearby: Mikell Pond Dam Gillespie Pond Dam
Last Updated: December 7, 2025
The Thomas J Holbrook Dam, located in Sumter, South Carolina, is a privately owned structure primarily used for irrigation purposes.
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Summary
Completed in the year 2000, this earth dam stands at a height of 15 feet and has a length of 725 feet, providing a storage capacity of 300 acre-feet. The dam, constructed with a stone core and soil foundation, spans the Robert Branch river.
Despite being classified as having a low hazard potential, the dam's condition was assessed as fair during its last inspection in April 2017. The South Carolina Department of Health and Environmental Control (SC DHEC) regulates and inspects the dam, ensuring its compliance with state safety standards. With a surface area of 44 acres and a normal storage capacity of 176 acre-feet, the Thomas J Holbrook Dam plays a crucial role in supporting agricultural activities in the region.
Year Completed |
2000 |
Dam Length |
725 |
Dam Height |
15 |
River Or Stream |
ROBERT BRANCH |
Primary Dam Type |
Earth |
Surface Area |
44 |
Nid Storage |
300 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wateree R. Bl Eastover
|
2400cfs |
Wateree River Nr. Camden
|
2170cfs |
Gills Creek At Columbia
|
76cfs |
Smith Branch At North Main St At Columbia
|
9cfs |
Congaree River At Columbia
|
4580cfs |
Lynches River Near Bishopville
|
425cfs |
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.
Thomas J Holbrook Dam