Mccollough Upper Pond Dam Reservoir Report
Last Updated: December 15, 2025
McCollough Upper Pond Dam, also known as W S McCollough Dam 2, is a privately owned structure located in Williamsburg, South Carolina.
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Summary
Completed in 1960, this earth dam stands at a height of 7 feet and stretches 745 feet in length, with a primary purpose of providing recreational opportunities. The dam holds a storage capacity of 75 acre-feet, with a normal storage level of 36 acre-feet, covering a surface area of 13 acres.
Despite its low hazard potential, the dam's condition assessment is rated as poor, indicating a need for maintenance and repair. The last inspection in November 2017 found the structure to be in need of attention, with a moderate risk assessment level. The dam is state regulated and inspected by the South Carolina Department of Health and Environmental Control, with enforcement measures in place. For water resource and climate enthusiasts, monitoring the condition and maintenance of McCollough Upper Pond Dam is important to ensure its safety and longevity for both recreational and environmental purposes.
Year Completed |
1960 |
Dam Length |
745 |
Dam Height |
7 |
River Or Stream |
TR-OX SWAMP |
Primary Dam Type |
Earth |
Surface Area |
13 |
Nid Storage |
75 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
7 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Black River At Kingstree
|
1280cfs |
Santee River Nr Jamestown
|
1170cfs |
Santee River Near Pineville
|
676cfs |
Lake Moultrie Tailrace Canal At Moncks Corner
|
9370cfs |
Turkey Creek Near Maryville
|
2cfs |
Pee Dee River At Hwy 701 Nr Bucksport
|
8500cfs |
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.
Mccollough Upper Pond Dam