Conservation Club 100 Lake Dam Reservoir Report
Last Updated: December 5, 2025
Conservation Club 100 Lake Dam, also known as Patoka Club Lake, is a privately-owned structure located in Marion, Illinois.
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Summary
Built in 1953, this earth dam stands at 30 feet tall and spans 400 feet in length. Its primary purpose is for recreation, providing a storage capacity of 391 acre-feet of water for activities such as fishing and boating.
Managed by the Illinois Department of Natural Resources (IDNR), the dam is regulated, permitted, inspected, and enforced by the state. It is classified as having a significant hazard potential, with a moderate risk assessment rating. While the condition assessment is not currently available, the dam has a regular inspection frequency of every 3 years to ensure its safety and functionality.
Situated on the TRIB NORTH FORK stream, Conservation Club 100 Lake Dam serves as a vital resource for water recreation enthusiasts in the area. With its uncontrolled spillway and outlet gates, the dam provides a scenic and enjoyable environment for visitors to enjoy the outdoors while also being a key component of the local ecosystem.
Year Completed |
1953 |
Dam Length |
400 |
Dam Height |
30 |
River Or Stream |
TRIB NORTH FORK |
Primary Dam Type |
Earth |
Nid Storage |
391 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
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.
Conservation Club 100 Lake Dam