Little Cache Structure 10 Dam Reservoir Report

Last Updated: December 5, 2025

Little Cache Structure 10 Dam, located in Johnson County, Illinois, was completed in 1969 with a primary purpose of flood risk reduction.


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Summary

Owned by the local government and regulated by the Illinois Department of Natural Resources, this earth dam stands at 36 feet high and spans a length of 1040 feet along the tributary of Little Cache Creek. With a maximum storage capacity of 1458 acre-feet and normal storage of 944 acre-feet, this dam plays a crucial role in water management in the region.

Designed by Clardia Engineering Co. and constructed with buttress core types, Little Cache Structure 10 Dam is equipped with uncontrolled spillways and outlet gates. Despite its low hazard potential and moderate risk assessment, the condition assessment of the dam is currently not available, with the last inspection conducted in June 2014. With a history of serving as a vital flood risk reduction structure and ensuring water supply for the local community, this dam stands as a testament to the importance of sustainable water resource management in the face of changing climate conditions.

Year Completed

1969

Dam Length

1040

Dam Height

36

River Or Stream

TRIB LITTLE CACHE CREEK

Primary Dam Type

Earth

Nid Storage

1458

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

36
       
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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.