Knollwood Dam 2 Reservoir Report
Nearby: Webber Pond Dam Eugene Oliver Dam
Last Updated: December 15, 2025
Knollwood Dam 2, located in Williamsburg, South Carolina, was completed in 1968 and serves multiple purposes including fire protection, stock, small fish pond, and recreation.
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Summary
This privately owned Earth dam stands at a height of 19 feet with a length of 405 feet, providing a storage capacity of 106 acre-feet. The dam is situated on the Walnut Branch river and is regulated by the South Carolina Department of Health and Environmental Control (SC DHEC), ensuring regular inspections and enforcement to maintain its structural integrity.
With a low hazard potential and fair condition assessment, Knollwood Dam 2 poses minimal risk to surrounding areas. Despite its age, the dam meets regulatory guidelines and has undergone inspections as recent as October 2017. The controlled spillway design ensures efficient water flow management, further reducing the risk of potential flooding. Additionally, the dam's location in a very high-risk area (risk level 1) highlights the importance of ongoing risk management measures to safeguard the surrounding community and environment from any unforeseen events.
For water resource and climate enthusiasts, Knollwood Dam 2 presents an intriguing case study of a privately owned dam with a diverse range of functions and a relatively low hazard potential. Its location in a high-risk area underscores the critical role of effective risk management and maintenance practices in ensuring the safety and sustainability of such infrastructure. As climate change continues to impact water resources, the management of dams like Knollwood Dam 2 will be essential in mitigating potential risks and adapting to changing environmental conditions.
Year Completed |
1968 |
Dam Length |
405 |
Dam Height |
19 |
River Or Stream |
WALNUT BRANCH |
Primary Dam Type |
Earth |
Surface Area |
11 |
Nid Storage |
106 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Santee River Near Pineville
|
670cfs |
Black River At Kingstree
|
1180cfs |
Lake Moultrie Tailrace Canal At Moncks Corner
|
14700cfs |
Santee River Nr Jamestown
|
1360cfs |
Back River At Dupont Intake Nr Kittredge
|
921cfs |
Turkey Creek Near Maryville
|
2cfs |
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.
Knollwood Dam 2