Venado Grande Lake Dam Reservoir Report
Last Updated: December 21, 2025
Venado Grande Lake Dam, located in Green Valley, Illinois, is a private-owned structure designed by Paul Adair for recreational purposes.
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Summary
Completed in 1975, this Earth-type dam stands at a height of 44 feet and stretches 415 feet in length, with a storage capacity of 1178 acre-feet. The dam, situated on the TRIB MACKINAW RIVER, is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and integrity.
With a significant hazard potential and a moderate risk assessment rating, Venado Grande Lake Dam remains a crucial part of the local water resource infrastructure. Its uncontrolled spillway and outlet gates contribute to its functionality for recreation and water storage purposes. Despite the limited data on its condition assessment, the dam's inspection frequency of every three years highlights the importance of maintaining its structural integrity to mitigate any potential risks to the surrounding community and environment.
Being a key feature in Tazewell County's water management system, Venado Grande Lake Dam serves as a vital asset for both recreational activities and water storage in the region. As climate change continues to impact water resources, the proper regulation, inspection, and maintenance of this dam are essential to ensure its long-term sustainability and resilience in the face of evolving environmental conditions.
Year Completed |
1975 |
Dam Length |
415 |
Dam Height |
44 |
River Or Stream |
TRIB MACKINAW RIVER |
Primary Dam Type |
Earth |
Nid Storage |
1178 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
44 |
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.
Venado Grande Lake Dam