City Of Jonesville Dam Reservoir Report
Nearby: Bogan Dam White Pines Lake Dam
Last Updated: December 5, 2025
The City of Jonesville Dam, located in Union, South Carolina, was completed in 1969 and serves primarily for recreation purposes, with an additional function of water supply.
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Summary
Standing at a height of 32 feet and a length of 835 feet, this earth dam on Eison Branch has a storage capacity of 345 acre-feet, with a normal storage level of 240 acre-feet. The dam, owned by the local government, is regulated by the South Carolina Department of Health and Environmental Control (DHEC) and undergoes regular inspections to ensure public safety.
Despite being classified as having a significant hazard potential, the condition assessment of the City of Jonesville Dam in December 2019 rated it as fair. The dam has a maintenance and emergency action plan in place, with inspections occurring every three years. It is important for water resource and climate enthusiasts to monitor the ongoing maintenance and risk management measures associated with the dam to ensure the safety of the surrounding community and the preservation of its recreational and water supply functions. With its historical significance and critical role in the local area, the City of Jonesville Dam stands as a testament to the importance of proper dam management in the face of changing environmental conditions.
Year Completed |
1969 |
Dam Length |
835 |
Dam Height |
32 |
River Or Stream |
EISON BRANCH |
Primary Dam Type |
Earth |
Surface Area |
26 |
Nid Storage |
345 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Lawsons Fork Creek At Spartanburg Sc
|
66cfs |
Broad River Below Cherokee Falls
|
900cfs |
Pacolet River Below Lake Blalock Near Cowpens
|
201cfs |
Broad River Near Gaffney
|
1890cfs |
Broad River Near Blacksburg
|
569cfs |
Broad River Near Carlisle
|
1870cfs |
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.
City Of Jonesville Dam