Roberts Lake Dam Reservoir Report
Last Updated: December 5, 2025
Roberts Lake Dam, located in Effingham, Illinois, was completed in 1965 and is primarily used for recreation.
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Summary
The dam, with a height of 22 feet and a length of 1010 feet, serves as a key feature on Fulfer Creek-offstream. Designed by the USDA NRCS, the dam is classified as an earth dam with a buttress core type. Its maximum storage capacity is 63 acre-feet, with a normal storage capacity of 48 acre-feet. The spillway type is uncontrolled with a spillway width of 53 feet.
The dam is privately owned and regulated by the Illinois Department of Natural Resources. It is state-jurisdictional and meets state permitting, inspection, and enforcement requirements. The hazard potential of the dam is categorized as low, with a moderate risk assessment rating. The last inspection was conducted in July 2015, with an inspection frequency of 5 years. While the condition assessment is not available, the dam's emergency action plan status and risk management measures remain undisclosed. Overall, Roberts Lake Dam presents a unique opportunity for water resource and climate enthusiasts to explore the intersection of man-made infrastructure and natural ecosystems in the region.
Year Completed |
1965 |
Dam Length |
1010 |
Dam Height |
22 |
River Or Stream |
FULFER CREEK-OFFSTREAM |
Primary Dam Type |
Earth |
Nid Storage |
63 |
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.
Roberts Lake Dam