Eureka Lake Dam Reservoir Report
Nearby: Rich Lake Dam Forest Lemon Dam
Last Updated: December 28, 2025
Eureka Lake Dam, located in Eureka, Illinois, serves as a crucial water supply structure for the community.
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Summary
Built in 1942 by designer J. J. Woltman, this earth dam stands at a height of 33 feet and spans 536 feet in length. With a normal storage capacity of 290 acre-feet and a maximum storage of 404 acre-feet, the dam plays a vital role in sustaining the water needs of the area.
Managed by the local government and regulated by the Illinois Department of Natural Resources, Eureka Lake Dam poses a significant hazard potential due to its uncontrolled spillway and significant drainage area of 3.2 square miles. Despite its age, the dam is inspected every three years to ensure its structural integrity and safety. With a moderate risk assessment score of 3, the dam's risk management measures are currently not available, highlighting the need for continued monitoring and maintenance to mitigate potential risks.
Eureka Lake Dam stands as a testament to the importance of water resource infrastructure in managing and providing for the needs of local communities. Its role in supplying water and mitigating flood risks underscores the critical nature of maintaining and monitoring such structures to safeguard public safety and ensure the sustainable use of water resources for future generations.
Year Completed |
1942 |
Dam Length |
536 |
Dam Height |
33 |
River Or Stream |
TRIB WALNUT CREEK |
Primary Dam Type |
Earth |
Surface Area |
30 |
Drainage Area |
3.2 |
Nid Storage |
404 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
33 |
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.
Eureka Lake Dam