Semmes Lake Reservoir Report
Nearby: Upper Legion Lake Lake Katherine Dam
Last Updated: December 14, 2025
Semmes Lake, located in Columbia, South Carolina, is a picturesque water resource managed by the US Army for recreational purposes.
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Summary
Built in 1940, this earth dam stands at 22 feet high and spans 970 feet in length, creating a serene surface area of 29 acres. With a storage capacity of 641 acre-feet and a maximum discharge of 800 cubic feet per second, Semmes Lake provides a tranquil setting for outdoor activities and wildlife observation.
Despite its primary purpose for recreation, Semmes Lake poses a significant hazard potential due to its uncontrolled spillway and moderate risk assessment rating. The dam is inspected every four years, with the last assessment conducted in March 2021. While the condition assessment is not available, the emergency action plan was last revised in June 2010, indicating a proactive approach to ensuring the safety and security of the surrounding community in the event of a dam failure.
With its scenic location along Wildcat Creek and close proximity to the urban hub of Columbia, Semmes Lake offers a unique blend of natural beauty and outdoor recreation opportunities. Managed by the US Army, this historic earth dam continues to be a beloved destination for water resource and climate enthusiasts seeking a peaceful retreat in the heart of South Carolina.
Year Completed |
1940 |
Dam Length |
970 |
Dam Height |
22 |
River Or Stream |
Wildcat Creek |
Primary Dam Type |
Earth |
Surface Area |
29 |
Hydraulic Height |
22 |
Drainage Area |
1 |
Nid Storage |
641 |
Structural Height |
27 |
Outlet Gates |
Other Controlled - 1 |
Hazard Potential |
Significant |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Gills Creek At Columbia
|
37cfs |
Smith Branch At North Main St At Columbia
|
3cfs |
Congaree River At Columbia
|
3140cfs |
Saluda River Near Columbia
|
907cfs |
Saluda River Below Lk Murray Dam Nr Columbia
|
775cfs |
Wateree R. Bl Eastover
|
2400cfs |
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.
Semmes Lake