Mcnairs Millpond Dam Reservoir Report
Nearby: Carraway Pond Dam Adams Pond Dam
Last Updated: December 5, 2025
Mcnairs Millpond Dam, located in Marlboro, South Carolina, is a historic structure completed in 1875 with a primary purpose of recreation.
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Summary
This Earth dam, with a buttress core type, stands at a height of 17 feet and has a length of 570 feet, creating a surface area of 75 acres on Beaverdam Creek. The dam has a storage capacity of 670 acre-feet and a normal storage level of 258 acre-feet.
Despite its age and historical significance, Mcnairs Millpond Dam has been classified as having a high hazard potential and an unsatisfactory condition assessment. The dam is under the regulatory oversight of the South Carolina Department of Health and Environmental Control (SC DHEC) and undergoes inspections every two years. With a very high risk rating, the dam poses significant challenges for risk management and emergency preparedness, highlighting the importance of ongoing monitoring and maintenance efforts to ensure the safety of the surrounding community and water resources.
Year Completed |
1875 |
Dam Length |
570 |
Dam Height |
17 |
River Or Stream |
BEAVERDAM CREEK |
Surface Area |
75 |
Nid Storage |
670 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Shoe Heel Creek Nr Laurinburg
|
82cfs |
Pee Dee River Nr Bennettsville
|
2460cfs |
Lumber River Near Maxton
|
372cfs |
Pee Dee R Nr Rockingham
|
1830cfs |
Drowning Creek Near Hoffman
|
181cfs |
Rockfish Creek At Raeford
|
104cfs |
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.
Mcnairs Millpond Dam