Louise Ervin Dam Reservoir Report
Nearby: Brown Dam Snowden Pond Dam
Last Updated: December 15, 2025
Louise Ervin Dam, located in Williamsburg, South Carolina, is a private earth dam completed in 1959 with a primary purpose of recreation.
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Summary
This dam, standing at a height of 9 feet and stretching 330 feet in length, holds a storage capacity of 145 acre-feet and covers a surface area of 30 acres. The dam is situated on TR-BLACK MINGO CREEK and is regulated by the South Carolina Department of Health and Environmental Control (DHEC).
Despite its low hazard potential, the dam's risk assessment is moderate, indicating a level 3 risk. The condition of the dam is currently not rated, with the last inspection conducted in November 2017. While the dam has not undergone any modifications in recent years, it is subject to regular inspections, enforcement, and permitting by the state regulatory agency. With its scenic location and recreational opportunities, Louise Ervin Dam serves as a valuable asset for water resource and climate enthusiasts in the region.
Year Completed |
1959 |
Dam Length |
330 |
Dam Height |
9 |
River Or Stream |
TR-BLACK MINGO CREEK |
Primary Dam Type |
Earth |
Surface Area |
30 |
Nid Storage |
145 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Black River At Kingstree
|
1180cfs |
Pee Dee River At Hwy 701 Nr Bucksport
|
7960cfs |
Turkey Creek Near Maryville
|
2cfs |
Santee River Nr Jamestown
|
1360cfs |
Waccamaw River At Conway Marina At Conway
|
2260cfs |
Lynches River At Effingham
|
516cfs |
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.
Louise Ervin Dam