Forest Lake Club Lake Dam Reservoir Report
Last Updated: December 30, 2025
Forest Lake Club Lake Dam, located in Macoupin, Illinois, is a private dam with a primary purpose of recreation.
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Summary
Built in 1904, this Earth dam stands at a height of 30 feet and has a length of 300 feet, providing a maximum storage capacity of 80 acre-feet. The dam overlooks the TRIB CAHOKIA CREEK and is regulated by the Illinois Department of Natural Resources.
Despite its low hazard potential, the dam has a moderate risk assessment rating. The dam features an uncontrolled spillway with a width of 37 feet and is equipped with uncontrolled outlet gates. The last inspection took place in July 2017, with a scheduled inspection frequency of 5 years. While the condition assessment is currently not available, the dam is actively monitored for any potential risks or hazards.
Forest Lake Club Lake Dam offers a picturesque recreational setting for water resource and climate enthusiasts to enjoy. With its historical significance and scenic surroundings, this dam serves as a vital structure in the local community, providing both leisure opportunities and essential water management functions.
Year Completed |
1904 |
Dam Length |
300 |
Dam Height |
30 |
River Or Stream |
TRIB CAHOKIA CREEK |
Primary Dam Type |
Earth |
Nid Storage |
80 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
Seasonal Comparison
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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.
Forest Lake Club Lake Dam