Lake Roberts Dam Reservoir Report
Last Updated: December 18, 2025
Lake Roberts Dam, located in Fulton County, Illinois, was completed in 1963 and is managed by a private owner with oversight from the Illinois Department of Natural Resources.
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Summary
Designed by the USDA NRCS, this earth dam stands at a height of 30 feet and spans 332 feet in length. Its primary purpose is for recreation, offering a serene water source for outdoor enthusiasts in the Avon-Offstream area.
With a storage capacity of 284 acre-feet, Lake Roberts Dam serves as a vital resource for the surrounding community, providing a picturesque backdrop for activities such as fishing, boating, and wildlife observation. The dam's low hazard potential and moderate risk assessment make it a safe and reliable structure for both water management and leisure purposes. Despite its uncontrolled spillway and outlet gates, the dam has undergone routine inspections every 5 years, with the last assessment conducted in August 2013.
Situated along the tributary of Cedar Creek, Lake Roberts Dam not only enhances the natural beauty of the region but also contributes to the overall water resource management in Illinois. With its tranquil waters and recreational opportunities, this earth dam stands as a testament to the importance of sustainable dam infrastructure for both environmental conservation and public enjoyment.
Year Completed |
1963 |
Dam Length |
332 |
Dam Height |
30 |
River Or Stream |
TRIB CEDAR CREEK |
Primary Dam Type |
Earth |
Nid Storage |
284 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Spoon River At London Mills
|
86cfs |
Spoon River At Seville
|
143cfs |
Illinois River At Kingston Mines
|
5510cfs |
Indian Creek Near Wyoming
|
3cfs |
Henderson Creek Near Oquawka
|
45cfs |
Edwards River Near Orion
|
66cfs |
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.
Lake Roberts Dam