Coffeen Power Sta. Supplemental Cooling Lake Dam Reservoir Report
Last Updated: December 5, 2025
The Coffeen Power Station Supplemental Cooling Lake Dam in Illinois, designed by SARGENT & LUNDY, stands as a crucial structure for water resource and climate enthusiasts.
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Summary
Completed in 2000, this earth dam spans 8485 feet and reaches a height of 21 feet, offering a storage capacity of 735 acre-feet. Located in Montgomery County, the dam plays a vital role in managing the water supply for the Coffeen community and surrounding areas.
Maintained by the Illinois Department of Natural Resources, the dam is inspected every three years to ensure its safety and integrity. With a significant hazard potential, the Coffeen Power Station Supplemental Cooling Lake Dam is equipped with a controlled spillway and slide gates for efficient water release. The risk assessment for this dam is rated at a very high level, emphasizing the importance of regular monitoring and upkeep to mitigate potential dangers.
As a critical infrastructure in the region, the Coffeen Power Station Supplemental Cooling Lake Dam serves as a testament to the intersection of water resource management and climate resilience. With its strategic location on the TRIB MCDAVID BRANCH tributary and state-regulated status, this dam stands as a cornerstone in ensuring water availability and safety for the Coffeen community and beyond.
Year Completed |
2000 |
Dam Length |
8485 |
Dam Height |
21 |
River Or Stream |
TRIB MCDAVID BRANCH |
Primary Dam Type |
Earth |
Surface Area |
80 |
Drainage Area |
80 |
Nid Storage |
735 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
21 |
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.
Coffeen Power Sta. Supplemental Cooling Lake Dam