Patterson Springs Lake Dam Reservoir Report
Last Updated: December 20, 2025
Patterson Springs Lake Dam in Illinois, completed in 1945, stands as a testament to both engineering ingenuity and the importance of water resource management.
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Summary
This privately owned earth dam, with a height of 13 feet and a length of 240 feet, serves primarily for recreational purposes, offering visitors a tranquil escape in the beautiful surroundings of Douglas County. Situated in the city of Hugo-Offstream, the dam overlooks the Tributary of Embarras River, providing a serene backdrop for outdoor enthusiasts.
Managed by the Illinois Department of Natural Resources, the dam has a low hazard potential and is subject to regular state inspections and enforcement measures to ensure its safety and compliance with regulations. The uncontrolled spillway, with a width of 31 feet, adds to the charm of the dam while serving its crucial function in managing water levels and ensuring the safety of surrounding areas. With a maximum storage capacity of 50 acre-feet, Patterson Springs Lake Dam is a vital component of the local water infrastructure, contributing to the overall water resource management efforts in the region.
Despite its age, Patterson Springs Lake Dam remains a reliable structure with a moderate risk assessment score. While the condition assessment is not currently available, the dam continues to be a focal point for water resource and climate enthusiasts, showcasing the intersection of engineering marvels and environmental stewardship. As visitors explore the area and enjoy the recreational opportunities it offers, they can also appreciate the significance of responsible dam management in maintaining a sustainable balance between human needs and the preservation of natural resources.
Year Completed |
1945 |
Dam Length |
240 |
Dam Height |
13 |
River Or Stream |
TRIB EMBARASS RIVER |
Primary Dam Type |
Earth |
Nid Storage |
50 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
13 |
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.
Patterson Springs Lake Dam