Main Lake Dam Reservoir Report
Nearby: Track Loop Pond Dam Arentsen Pond Dam
Last Updated: December 13, 2025
Main Lake Dam, located in Equality, Illinois, is a privately owned earth dam that was completed in 1976 by CAMBELL & WEINLAND.
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Summary
The dam stands at a height of 28 feet and has a length of 2200 feet, providing a storage capacity of 1285 acre-feet for water supply purposes. It is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and compliance with state regulations.
The dam features a controlled spillway with a width of 274 feet and other controlled outlet gates. Despite being classified as having a low hazard potential, the risk assessment for Main Lake Dam indicates a very high risk level, emphasizing the importance of proper risk management measures. The surrounding area is prone to inundation, with the dam situated on TRIB WHEELER CREEK and falling under the jurisdiction of the St. Louis District of the US Army Corps of Engineers.
Although the condition assessment and emergency action plan status for Main Lake Dam are currently not available, the dam remains a critical infrastructure for water resource management in Hamilton County, Illinois. With its vital role in providing water supply and the potential risks involved, ongoing monitoring and maintenance efforts are essential to ensure the safety and functionality of Main Lake Dam for both local communities and the environment.
Year Completed |
1976 |
Dam Length |
2200 |
Dam Height |
28 |
River Or Stream |
TRIB WHEELER CREEK |
Primary Dam Type |
Earth |
Nid Storage |
1285 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
28 |
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.
Main Lake Dam