Coffeen East Fork Shoal Creek Gate Dam Reservoir Report
Last Updated: December 5, 2025
The Coffeen East Fork Shoal Creek Gate Dam, located in Montgomery County, Illinois, serves as a crucial water supply structure managed by a public utility.
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Summary
Completed in 2010, this dam stands at a height of 11.6 feet and has a storage capacity of 107.5 acre-feet, making it an essential component in maintaining the water resources of the region. With a low hazard potential and moderate risk assessment, the dam plays a vital role in managing the flow of the East Fork Shoal Creek and ensuring water availability for the surrounding areas.
Designed by Hanson Professional Services, Inc., this buttress dam is regulated and inspected by the Illinois Department of Natural Resources to ensure its structural integrity and operational effectiveness. The dam's primary purpose is water supply, catering to the needs of the Greenville community and beyond. Despite its relatively low hazard potential, the dam is subject to regular inspections and risk assessments to mitigate any potential risks and ensure the safety of the surrounding area. With its strategic location and efficient design, the Coffeen East Fork Shoal Creek Gate Dam stands as a testament to effective water resource management in Illinois.
Year Completed |
2010 |
Dam Length |
45 |
Dam Height |
11.6 |
River Or Stream |
EAST FORK SHOAL CREEK |
Primary Dam Type |
Other |
Drainage Area |
102.4 |
Nid Storage |
107.5 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
12 |
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 East Fork Shoal Creek Gate Dam