Lake Storey Dam Reservoir Report
Last Updated: December 18, 2025
Lake Storey Dam, located in Soperville, Illinois, is a significant earth dam constructed in 1942 by the Atchison, Topeka & Santa Fe company.
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Summary
Serving primarily for recreational purposes, the dam stands at a height of 53 feet and spans 770 feet in length, with a maximum storage capacity of 3016 acre-feet. The dam overlooks the TRIB SOUTH HENDERSON CREEK and has a spillway width of 240 feet, facilitating a maximum discharge rate of 33,710 cubic feet per second.
Despite its crucial role in providing recreational opportunities and water storage, Lake Storey Dam poses a high hazard potential due to its age and condition assessment being unavailable. The dam's risk assessment indicates a moderate level of risk, with a recent inspection conducted in September 2020. The dam is regulated by the Illinois Department of Natural Resources (IDNR) and falls under the jurisdiction of the state, ensuring that necessary inspections and enforcement measures are in place to mitigate potential risks and ensure public safety in the surrounding area. Enthusiasts of water resources and climate should take note of Lake Storey Dam as a key infrastructure contributing to the region's water management and recreational activities.
Year Completed |
1942 |
Dam Length |
770 |
Dam Height |
53 |
River Or Stream |
TRIB SOUTH HENDERSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
109 |
Drainage Area |
6.77 |
Nid Storage |
3016 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
53 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Edwards River Near Orion
|
66cfs |
Spoon River At London Mills
|
86cfs |
Henderson Creek Near Oquawka
|
45cfs |
Pope Creek Near Keithsburg
|
25cfs |
Indian Creek Near Wyoming
|
3cfs |
Edwards River Near New Boston
|
41cfs |
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 Storey Dam