Lake Jaycee Dam Reservoir Report
Last Updated: December 6, 2025
Lake Jaycee Dam, located in Mount Vernon, Illinois, was completed in 1905 and serves as a vital resource for both recreation and water supply in the area.
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Summary
Owned by the local government, the dam stands at a height of 30 feet with a length of 875 feet, creating a reservoir with a storage capacity of 2,110 acre-feet. The dam is situated on the Tributary Casey Fork river and is regulated by the Illinois Department of Natural Resources, with regular inspections and enforcement to ensure its safety and functionality.
With a spillway width of 51 feet and a maximum discharge capacity of 3,257 cubic feet per second, Lake Jaycee Dam is designed to manage significant water flow and mitigate potential hazards. The dam's hazard potential is rated as significant, with a moderate risk assessment score of 3. While the condition assessment is not currently available, the dam's emergency action plan status and risk management measures are not specified, indicating a need for further information on its preparedness and response protocols.
Overall, Lake Jaycee Dam plays a crucial role in the water resource management of Jefferson County, Illinois, providing both recreational opportunities and essential water supply for the community. Its earth dam structure and uncontrolled spillway highlight the importance of ongoing monitoring and maintenance to ensure the safety and effectiveness of this key infrastructure in the region's water management system.
Year Completed |
1905 |
Dam Length |
875 |
Dam Height |
30 |
River Or Stream |
TRIB CASEY FORK |
Primary Dam Type |
Earth |
Surface Area |
115 |
Drainage Area |
2.5 |
Nid Storage |
2110 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
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.
Lake Jaycee Dam