Philadelphia Sewage Lagoon Dam Reservoir Report
Last Updated: December 6, 2025
The Philadelphia Sewage Lagoon Dam in Neshoba, Mississippi is a vital structure owned by the local government and regulated by the Mississippi Department of Environmental Quality.
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Summary
This earth dam, with a height of 12 feet, serves a primary purpose of managing wastewater and has a storage capacity of 285 acre-feet. Despite being classified as having an undetermined hazard potential and not rated in terms of condition assessment, the dam meets state permitting and inspection requirements.
Located within the Mobile District, the Philadelphia Sewage Lagoon Dam is designed with a buttress core type and an uncontrolled spillway. While the dam's risk assessment is considered moderate, with a risk ranking of 3, there are no specific risk management measures identified. The dam has not been modified in recent years and lacks certain emergency preparedness features such as an emergency action plan and updated contact information.
For water resource and climate enthusiasts, the Philadelphia Sewage Lagoon Dam presents an interesting case of a critical infrastructure serving a unique purpose in managing wastewater while also posing moderate risk potential. With its state-regulated status and the need for enhanced emergency preparedness measures, this dam underscores the importance of maintaining and monitoring vital water resources to ensure the safety and well-being of communities in the face of potential hazards.
Dam Height |
12 |
Nid Storage |
285 |
Hazard Potential |
Undetermined |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pearl River At Burnside
|
1070cfs |
Pearl River At Edinburg
|
182cfs |
Tuscolameta Creek At Walnut Grove
|
137cfs |
Pearl River Nr Carthage
|
263cfs |
South Canal Tuscolameta Creek Nr Walnut Grove
|
8cfs |
Pearl River Nr Lena
|
468cfs |
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.
Philadelphia Sewage Lagoon Dam