Coffeen Station Ash Pond 2 Dam Reservoir Report
Last Updated: December 5, 2025
Coffeen Station Ash Pond 2 Dam in Montgomery County, Illinois, is a rockfill dam with a buttress core that is state-regulated by the Illinois Department of Natural Resources.
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Summary
Situated on the east fork of Shoal Creek, this dam serves a primary purpose that is classified as "Other". While specific details such as dam height, volume, and completion year are not provided, the dam is marked as having a significant hazard potential and a moderate risk assessment rating.
The dam, owned by a public utility, falls under the jurisdiction of the state and is subject to state permitting, inspection, and enforcement. With a spillway type listed as "Uncontrolled", the dam poses a potential risk to the surrounding area in case of a breach. The last inspection date was in November 2020, with an inspection frequency of every three years. While the condition assessment is marked as "Not Available", the dam is designated as having a significant hazard potential, indicating a need for ongoing monitoring and management.
For water resource and climate enthusiasts, Coffeen Station Ash Pond 2 Dam presents an intriguing case study in dam safety and management. With a location on the Tributary East Fork Shoal Creek and a moderate risk assessment rating, this dam highlights the importance of regular inspections, emergency action planning, and risk management measures to ensure the safety of nearby communities and the surrounding environment. Despite some missing details regarding the dam's specifications, its state-regulated status and significant hazard potential warrant attention from those interested in the intersection of water resources, infrastructure, and climate resilience.
River Or Stream |
TRIB EAST FORK SHOAL CR |
Primary Dam Type |
Rockfill |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
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 Station Ash Pond 2 Dam