Shelbyville Dam Reservoir Report
Last Updated: December 22, 2025
Shelbyville Dam, also known as Lake Shelbyville, is a concrete dam located in Shelby, Illinois, along the Kaskaskia River.
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Summary
Built in 1970 by the US Army Corps of Engineers, the dam stands at a height of 108 feet and has a structural height of 138 feet. With a storage capacity of over 1 million acre-feet and a maximum discharge of 162,500 cubic feet per second, the dam serves primarily for flood risk reduction, but also supports fish and wildlife habitat, navigation, recreation, and water supply.
The dam's high hazard potential is mitigated through regular inspections, emergency action plans, and risk management measures implemented by the US Army Corps of Engineers. In case of severe weather events or pressure on the dam, controlled releases of water are performed to maintain its structural integrity. The agency collaborates with local emergency managers to ensure public safety and preparedness in the event of a dam-related emergency. With a focus on continual monitoring and maintenance, the USACE works to minimize flood risks associated with the dam and protect downstream communities.
Overall, Shelbyville Dam plays a crucial role in managing water resources in the region and serves as a vital infrastructure for flood control and water supply. With its strategic location and effective risk management practices, the dam stands as a testament to the dedication of the US Army Corps of Engineers in safeguarding communities and the environment from potential hazards.
Year Completed |
1970 |
Dam Length |
3025 |
Dam Height |
108 |
River Or Stream |
KASKASKIA RIVER |
Primary Dam Type |
Concrete |
Surface Area |
11100 |
Hydraulic Height |
102 |
Drainage Area |
1054 |
Nid Storage |
1026546 |
Structural Height |
138 |
Outlet Gates |
Slide (sluice gate) - 2, Tainter (radial) - 3 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
138 |
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.
Shelbyville Dam