Humm Lake Dam Reservoir Report

Last Updated: December 5, 2025

Located in Golconda, Illinois, the Humm Lake Dam stands as a private structure regulating the flow of the tributary Hobbs Creek.


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Summary

Completed in 1966, this earth dam stretches 525 feet in length and reaches a modest height of 17 feet, providing a storage capacity of 58 acre-feet for recreational purposes. Despite its low hazard potential, the dam is under the jurisdiction of the Illinois Department of Natural Resources, which oversees its regulation, inspection, and enforcement.

With a spillway width of zero and uncontrolled outlet gates, the Humm Lake Dam poses a moderate risk level according to assessments. While its condition assessment is currently unavailable, the dam undergoes inspections every five years to ensure its structural integrity. Although the dam lacks an Emergency Action Plan (EAP) and inundation maps, its risk management measures and hazard potential contribute to its overall safety and functionality for the community and visitors alike. For water resource and climate enthusiasts, the Humm Lake Dam serves as a noteworthy example of a privately owned structure supporting recreational activities while maintaining regulatory compliance and risk management protocols.

Year Completed

1966

Dam Length

525

Dam Height

17

River Or Stream

TRIB HOBBS CREEK

Primary Dam Type

Earth

Nid Storage

58

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

17
       
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.