Marissa Wwtp Basin Dam Reservoir Report
Last Updated: December 25, 2025
Marissa Wwtp Basin Dam, located in Marissa, Illinois, is a crucial structure owned and regulated by the local government.
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Summary
Designed by RHUTASEL & ASSOC., this dam serves multiple purposes and falls under the category of an Earth dam with a Buttress core type. With the State of Illinois overseeing its permitting, inspection, and enforcement, this dam plays a significant role in water resource management in St. Clair County.
Although specific data on the dam's height, volume, and completion year are not available, its importance is highlighted by its hazard potential being classified as significant and the risk assessment indicating a high risk level. The dam does not have a spillway, but its emergency action plan status and risk management measures are not currently available. Despite these uncertainties, the Marissa Wwtp Basin Dam remains a critical infrastructure in the region, with its last inspection conducted in August 2018 and a regular inspection frequency of 3 years.
With the St. Louis District of the US Army Corps of Engineers overlooking the area, Marissa Wwtp Basin Dam stands as a testament to the intricate network of water resource management and climate resilience efforts in Illinois. Its location and significance underscore the need for continued monitoring and maintenance to ensure the safety and sustainability of this essential infrastructure for the community and surrounding environment.
Primary Dam Type |
Earth |
Outlet Gates |
None |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Silver Creek Near Freeburg
|
28cfs |
Kaskaskia River At New Athens
|
551cfs |
Richland Creek Near Hecker
|
13cfs |
Kaskaskia River Near Venedy Station
|
923cfs |
Silver Creek Near Troy
|
5cfs |
Mississippi River At St. Louis
|
78100cfs |
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.
Marissa Wwtp Basin Dam