Grahams Lake Dam Reservoir Report
Nearby: Darwish Dam Glenview Farms Lake Dam
Last Updated: December 18, 2025
Grahams Lake Dam, located in Peoria, Illinois, is a privately owned structure with a primary purpose of providing recreational opportunities.
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Summary
Built in 1950 by the Soil Conservation Service (SCS), this earth dam stands at a height of 32 feet and spans 412 feet in length. With a storage capacity of 90 acre-feet, the dam is regulated by the Illinois Department of Natural Resources (IDNR) and undergoes inspections every five years to ensure its safety and functionality.
Despite its low hazard potential, Grahams Lake Dam plays a crucial role in managing the flow of the Trib Tiber Creek tributary. The dam features an uncontrolled spillway and outlet gates, contributing to its moderate risk assessment rating. While the dam's condition assessment is currently not available, it is important for water resource and climate enthusiasts to monitor its maintenance and regulatory compliance to prevent any potential risks associated with its operation.
With its scenic location and recreational benefits, Grahams Lake Dam serves as a vital piece of infrastructure in the community of Glasford-Offstream. As climate change continues to impact water resources, the proper management and maintenance of dams like Grahams Lake become increasingly important to ensure their long-term sustainability and resilience in the face of evolving environmental challenges.
Year Completed |
1950 |
Dam Length |
412 |
Dam Height |
32 |
River Or Stream |
TRIB TIBER CREEK |
Primary Dam Type |
Earth |
Nid Storage |
90 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Illinois River At Kingston Mines
|
5510cfs |
Spoon River At London Mills
|
86cfs |
Fondulac Creek Near East Peoria
|
0cfs |
Mackinaw River Near Green Valley
|
32cfs |
Farm Creek At Farmdale
|
19cfs |
Spoon River At Seville
|
143cfs |
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.
Grahams Lake Dam