Fillmore Lake Dam Reservoir Report
Last Updated: December 5, 2025
Fillmore Lake Dam, located in Coffeen-Offstream, Illinois, is a privately owned earth dam primarily used for recreation.
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Summary
Constructed in 1970 by the USDA NRCS, this dam stands at a height of 22 feet and has a length of 339 feet, providing a storage capacity of 104 acre-feet. The dam is situated on the tributary Dry Fork Hurricane Creek and is regulated by the Illinois Department of Natural Resources, with state permitting, inspection, and enforcement in place.
Despite being classified as having a low hazard potential, Fillmore Lake Dam is considered to have a moderate risk level. The spillway width is 50 feet, and the dam's condition assessment is not available as of now. The dam does not have an Emergency Action Plan (EAP) in place, but it undergoes inspections every 5 years. The risk management measures and inundation maps for the dam are also not currently prepared.
Water resource and climate enthusiasts interested in Fillmore Lake Dam will find its design and purpose intriguing, as well as the regulatory oversight by the state of Illinois. The dam serves as a recreational site and contributes to the management of water resources in Montgomery County. With a focus on risk assessment and potential modifications, there is ongoing attention to the safety and integrity of Fillmore Lake Dam in balance with its recreational function and environmental impact on the surrounding area.
Year Completed |
1970 |
Dam Length |
339 |
Dam Height |
22 |
River Or Stream |
TRIB DRY FORK HURRICANE CREEK |
Primary Dam Type |
Earth |
Nid Storage |
104 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
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.
Fillmore Lake Dam