A16 Pond Dam Reservoir Report

Last Updated: December 5, 2025

A16 Pond Dam, also known as Pond 60, is a Federal-owned structure in Williamson, Illinois, managed by the Fish and Wildlife Service.


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Summary

Built in 1970, this Earth dam stands at 13 feet high and spans 1260 feet in length, providing a storage capacity of 407 acre-feet for its primary purpose as a Fish and Wildlife Pond. The dam is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.

With a low hazard potential and a moderate risk assessment rating, A16 Pond Dam poses minimal danger to its surrounding area. Despite its unsatisfactory condition assessment in 2011, the dam continues to serve its purpose effectively, with a normal storage capacity of 110 acre-feet and a maximum discharge rate of 4430 cubic feet per second. The dam features an uncontrolled spillway with a width of 250 feet, ensuring proper water management during high flow events.

Located in an unnamed stream, A16 Pond Dam plays a crucial role in supporting the local ecosystem and providing habitat for fish and wildlife. With its association with the Fish and Wildlife Service, the dam not only serves as a water resource management structure but also contributes to conservation efforts in the region. Its historical significance and ongoing maintenance highlight the importance of sustainable water infrastructure for climate resilience and ecosystem health.

Year Completed

1970

Dam Length

1260

Dam Height

13

River Or Stream

Unnamed Stream

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

13

Drainage Area

1.5

Nid Storage

407

Structural Height

13

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

13
       
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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.