Vandalia Wastewater Treatment Lagoon Reservoir Report
Last Updated: December 5, 2025
The Vandalia Wastewater Treatment Lagoon, also known as Lagoon 1 & 2, is a vital facility owned by the local government in Vandalia, Illinois.
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Summary
Designed by HENRY, MEISENHEIMER & GENDE, this lagoon plays a crucial role in treating wastewater before it is discharged into the Kaskaskia River. With state regulation, inspection, and enforcement in place, the facility ensures that all necessary measures are taken to protect the environment and public health.
Constructed in 1986, the Vandalia Wastewater Treatment Lagoon stands at a height of 16 feet and has a storage capacity of 300 acre-feet. Its primary purpose is categorized as "Other," with a low hazard potential and a moderate risk assessment rating. While the condition assessment is not available, the facility's emergency action plan status and risk management measures indicate a commitment to ensuring its safe operation and compliance with guidelines.
Located within Fayette County, Illinois, the Vandalia Wastewater Treatment Lagoon serves as a critical infrastructure for managing wastewater and protecting water resources. With features such as an uncontrolled spillway and outlet gates, the facility plays a key role in maintaining water quality and mitigating potential risks. As a significant component of the local government's infrastructure, this lagoon underscores the importance of sustainable water resource management in the face of changing climate conditions.
Year Completed |
1986 |
Dam Length |
4000 |
Dam Height |
16 |
River Or Stream |
KASKASKIA RIVER |
Primary Dam Type |
Earth |
Nid Storage |
300 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Vandalia Wastewater Treatment Lagoon