Bay Creek Structure 4 Dam Reservoir Report

Last Updated: December 5, 2025

Bay Creek Structure 4 Dam, located in Reevesville, Illinois, was completed in 1977 by USDA NRCS and serves as a crucial flood risk reduction measure along the TRIB JOHNSON CREEK.


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Summary

This privately-owned earth dam stands at a height of 36 feet and has a length of 845 feet, with a storage capacity of 366 acre-feet. The dam is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its structural integrity.

Despite its low hazard potential, Bay Creek Structure 4 Dam plays a significant role in mitigating flood risks in Johnson County, Illinois. The dam features an uncontrolled spillway with a width of 116 feet and is equipped with uncontrolled outlet gates. While its condition assessment is currently unavailable, the dam operates under a moderate risk classification. With a history of moderate risk management measures, the dam remains a critical infrastructure for protecting the surrounding community from potential flooding events.

In the event of an emergency, the dam's Emergency Action Plan status is not specified, but it is inspected every five years to assess its performance and address any potential risks. Bay Creek Structure 4 Dam, with its efficient flood risk reduction capabilities and moderate risk management strategies, stands as a vital component of water resource management and climate resilience efforts in Johnson County, Illinois.

Year Completed

1977

Dam Length

845

Dam Height

36

River Or Stream

TRIB JOHNSON CREEK

Primary Dam Type

Earth

Nid Storage

366

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

36
       
Seasonal Comparison

Weather Forecast

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.