Summary
The dam is privately owned and regulated by the Illinois Department of Natural Resources, ensuring proper inspection, permitting, and enforcement measures are in place to maintain its structural integrity and safety standards. Standing at a height of 21 feet and with a length of 2500 feet, the dam has a storage capacity of 367 acre-feet and primarily functions to support water resource needs.
Despite its significant hazard potential, the National Petroleum Chemical Plant Lake Dam is categorized as having a moderate risk level, as per the latest assessment. The dam features uncontrolled spillways and outlet gates, and although its condition assessment is currently unavailable, regular inspections are conducted every three years to monitor its operational status. The dam's location offstream of the Kaskaskia River and its association with the National Petroleum Chemical Plant make it a key infrastructure piece for water management in the region, emphasizing the importance of its continued maintenance and risk management efforts.
Year Completed |
1952 |
Dam Length |
2500 |
Dam Height |
21 |
River Or Stream |
KASKASKIA RIVER-OFFSTREAM |
Primary Dam Type |
Earth |
Nid Storage |
367 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
21 |
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.
National Petroleum Chemical Plant Lake Dam