Shady Eighty Acres Lake Dam Reservoir Report
Nearby: Coles Lake Dam Greenfield City Dam
Last Updated: December 21, 2025
Shady Eighty Acres Lake Dam, located in Greene County, Illinois, is a privately owned structure with a primary purpose of recreation.
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Summary
This earth dam, completed in 1966, stands at a height of 17 feet and has a NID storage capacity of 105 acre-feet. The dam, situated on the Taylor Creek-Offstream, serves as a popular spot for outdoor enthusiasts to enjoy water-based activities in a serene natural setting.
Managed by the Illinois Department of Natural Resources, Shady Eighty Acres Lake Dam boasts a low hazard potential and moderate risk assessment. The dam features an uncontrolled spillway and outlet gates, with a width of 49 feet. Although the condition assessment is currently unavailable, regular inspections are conducted every 5 years to ensure the safety and integrity of the structure. With its picturesque surroundings and recreational opportunities, this dam is a must-visit destination for water resource and climate enthusiasts looking to explore the beauty of Illinois' waterways.
In the event of an emergency, contact information and guidelines for the Emergency Action Plan (EAP) are yet to be updated for Shady Eighty Acres Lake Dam. Overall, the dam poses a low threat level but remains a critical piece of infrastructure for the community. As climate change continues to impact water resources, it is essential to monitor and maintain structures like Shady Eighty Acres Lake Dam to ensure the safety of both the environment and the surrounding area.
Year Completed |
1966 |
Dam Length |
430 |
Dam Height |
17 |
River Or Stream |
TAYLOR CREEK-OFFSTREAM |
Primary Dam Type |
Earth |
Nid Storage |
105 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
17 |
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.
Shady Eighty Acres Lake Dam