Evergreen Lake Dam Reservoir Report
Nearby: Comlara Park Pond Dam Stark Pond Dam
Last Updated: December 21, 2025
Evergreen Lake Dam in Mackinaw, Illinois, is a vital structure owned by the local government with a primary purpose of recreation and water supply.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1971, this earth dam stands at a height of 69 feet and has a length of 1780 feet, holding a storage capacity of 22,875 acre-feet. Situated on Six Mile Creek, the dam has a high hazard potential and is regulated, inspected, and enforced by the Illinois Department of Natural Resources.
The dam features an uncontrolled spillway with a width of 145 feet and is associated with the stunning Evergreen Lake. Its design by WARREN & VAN PRAAG, INC. ensures the safety and functionality of the structure, although its condition assessment is not currently available. With a moderate risk assessment rating, Evergreen Lake Dam plays a critical role in the area's water resource management and recreational activities. For water resource and climate enthusiasts, this dam offers a fascinating glimpse into the intersection of human infrastructure and natural ecosystems.
Year Completed |
1971 |
Dam Length |
1780 |
Dam Height |
69 |
River Or Stream |
SIX MILE CREEK |
Primary Dam Type |
Earth |
Nid Storage |
22875 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
69 |
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.
Evergreen Lake Dam