Evergreen Lake Dam Reservoir Report
Nearby: Woodland Lake Dam Osage Lake Dam
Last Updated: December 22, 2025
Evergreen Lake Dam, located in Macoupin, Illinois, was completed in 1953 and serves as a recreational site along the TRIB WEST FORK WOOD RIVER.
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Summary
The dam, with a height of 34 feet and a length of 387 feet, primarily functions for recreation purposes, providing a storage capacity of 222 acre-feet. The dam's spillway, with a width of 72 feet, is uncontrolled, and the hazard potential is rated as low, with a moderate risk assessment.
Managed by a private owner, Evergreen Lake Dam is regulated and permitted by the Illinois Department of Natural Resources, with inspections and enforcement carried out regularly. The dam's design type is earth with a buttress core, and it is situated in a picturesque setting that offers opportunities for outdoor activities. Despite its age, the dam is maintained to ensure its structural integrity and safety, with the last inspection conducted in June 2018 and a five-year inspection frequency.
For water resource and climate enthusiasts, Evergreen Lake Dam presents an interesting case study in dam management and recreational use. With its historical significance and role in providing water storage for recreational purposes, the dam stands as a testament to the importance of sustainable water resource management. Its location in a scenic environment adds to its appeal, making it a popular destination for outdoor enthusiasts and nature lovers alike. The dam's low hazard potential and moderate risk assessment highlight the importance of ongoing monitoring and maintenance to ensure the safety of both the structure and the surrounding area.
Year Completed |
1953 |
Dam Length |
387 |
Dam Height |
34 |
River Or Stream |
TRIB WEST FORK WOOD RIVER |
Primary Dam Type |
Earth |
Nid Storage |
222 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
34 |
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.
Evergreen Lake Dam