Clovertowne Lake Dam Reservoir Report

Last Updated: December 25, 2025

Clovertowne Lake Dam, located in St.


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Summary

Clair County, Illinois, was completed in 1984 and is owned privately. The dam, designed by THOUVENOT, WADE & MOERCHEN, stands at a height of 32 feet and spans 200 feet in length. Its primary purpose is for recreation, with a storage capacity of 70 acre-feet and a maximum discharge rate of 30 cubic feet per second. The dam is situated on the TRIB NEGRO HOLLOW CREEK and is regulated by the Illinois Department of Natural Resources.

Despite its low hazard potential, the dam has a moderate risk assessment due to its lack of condition assessment data. The last inspection was conducted in October 2018 with a frequency of every 5 years. The spillway is uncontrolled, with a width of 9 feet, and the outlet gates are also uncontrolled. While an Emergency Action Plan (EAP) is not available, the dam's risk management measures and inundation maps are yet to be prepared.

Overall, Clovertowne Lake Dam serves as a vital recreational resource in the area, offering a serene environment for outdoor enthusiasts. Its design and construction uphold safety standards, although there is room for improvement in terms of risk assessment and emergency preparedness. Water resource and climate enthusiasts can appreciate the significance of maintaining and enhancing the functionality of such dams to ensure sustainable water management practices in the region.

Year Completed

1984

Dam Length

200

Dam Height

32

River Or Stream

TRIB NEGRO HOLLOW CREEK

Primary Dam Type

Earth

Nid Storage

70

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

32
       
Seasonal Comparison

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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.