Ralph Harris Lake Dam Reservoir Report
Last Updated: December 6, 2025
Ralph Harris Lake Dam, located in Union, Mississippi, is a privately owned structure regulated by the Mississippi Department of Environmental Quality.
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Summary
The dam, primarily built for recreation purposes, stands at a height of 22 feet and has a storage capacity of 84 acre-feet. Its core type is buttress, and it features an uncontrolled spillway.
Despite being classified with an undetermined hazard potential and a moderate risk assessment, the dam's condition has not been rated. It has not undergone recent inspections, and there is no Emergency Action Plan (EAP) in place. The dam's risk management measures and inundation maps are also not currently prepared, highlighting the need for improved monitoring and emergency preparedness for this essential water resource structure. For water resource and climate enthusiasts, the Ralph Harris Lake Dam presents an intriguing case study on the importance of proactive maintenance and risk assessment for ensuring the safety and sustainability of vital infrastructure in the face of changing environmental conditions.
Dam Height |
22 |
Nid Storage |
84 |
Hazard Potential |
Undetermined |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Town Creek At Eason Boulevard At Tupelo
|
65cfs |
Twentymile Creek Nr Guntown
|
36cfs |
Little Tallahatchie River At Etta
|
220cfs |
Tombigbee River Nr Fulton
|
182cfs |
Town Creek Nr Nettleton
|
218cfs |
Cummings Creek Nr Fulton
|
26cfs |
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.
Ralph Harris Lake Dam