Justamir Association Lake Dam Reservoir Report
Last Updated: December 23, 2025
Justamir Association Lake Dam, located in Evansville, Illinois, is a private earth dam completed in 1931 with a primary purpose of recreation.
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Summary
The dam stands at 11 feet tall with a length of 330 feet, creating a storage capacity of 51 acre-feet. Despite its low hazard potential, the dam is regulated, permitted, inspected, and enforced by the Illinois Department of Natural Resources, ensuring its safety and compliance with state regulations.
Situated on the tributary Prairie Du Long Creek, Justamir Association Lake Dam offers a serene recreational space for water resource and climate enthusiasts to enjoy. The dam's spillway is uncontrolled, and it boasts a moderate risk assessment level of 3. While the condition assessment and emergency action plan details are not available, the dam is subject to regular inspections every 5 years to maintain its structural integrity and safety standards.
With its picturesque setting and historical significance dating back to the early 20th century, Justamir Association Lake Dam serves as a vital part of the local landscape in St. Clair County, Illinois. As an integral feature for water storage and recreational activities, the dam's management and maintenance ensure the preservation of this valuable water resource for future generations of enthusiasts to appreciate and enjoy.
Year Completed |
1931 |
Dam Length |
330 |
Dam Height |
11 |
River Or Stream |
TRIB PRAIRIE DU LONG CREEK |
Primary Dam Type |
Earth |
Nid Storage |
51 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
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.
Justamir Association Lake Dam