Upper Chewalla Lake Dam Reservoir Report
Last Updated: December 5, 2025
Upper Chewalla Lake Dam, located in Marshall, Mississippi, is a Federal-owned structure that serves multiple purposes beyond just water resource management.
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Summary
Built in 1993, this Earth-type dam stands at a height of 20 feet and has a length of 699 feet, providing a storage capacity of 545 acre-feet. The dam's primary purpose is categorized as "Other," with a low hazard potential and a moderate risk assessment rating.
Managed by the Mississippi Department of Environmental Quality, Upper Chewalla Lake Dam is regulated, permitted, inspected, and enforced by the state authorities to ensure its safety and compliance with environmental standards. Despite not having an official condition rating, the dam's risk management measures are in place, indicating a proactive approach to maintaining its integrity. With a normal storage capacity of 80 acre-feet and a drainage area of 2.9 square miles, the dam plays a crucial role in water management in the region.
While the dam does not have a designated emergency action plan or inundation maps prepared, its location and design contribute to a controlled spillway operation in case of high discharge events. With a focus on risk mitigation and safety protocols, Upper Chewalla Lake Dam stands as a vital infrastructure for water resource enthusiasts and climate advocates, showcasing the importance of responsible dam management in safeguarding communities and ecosystems.
Year Completed |
1993 |
Dam Length |
699 |
Dam Height |
20 |
Primary Dam Type |
Earth |
Surface Area |
23 |
Drainage Area |
2.9 |
Nid Storage |
545 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Tallahatchie River At Etta
|
156cfs |
Wolf River At Lagrange
|
227cfs |
Wolf River At Rossville
|
497cfs |
Coldwater River Nr Olive Branch
|
104cfs |
Hatchie River Near Walnut
|
153cfs |
Yocona River Nr Oxford
|
96cfs |
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.
Upper Chewalla Lake Dam