Monroe Street Dam Reservoir Report

Last Updated: December 22, 2025

Monroe Street Dam, located in Macon, Illinois, is a vital structure managed by the local government for flood risk reduction along the TRIB SPRING CREEK.


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Summary

Built in 1991 by the design firm BG&M, this earth dam stands at 16 feet tall and stretches 610 feet in length. With a storage capacity of 182 acre-feet, the dam plays a crucial role in mitigating the impact of heavy rainfall and protecting the surrounding areas from potential flooding.

Managed by the Illinois Department of Natural Resources, Monroe Street Dam has a hazard potential categorized as low and a moderate risk assessment rating. The dam features an uncontrolled spillway with a width of 212 feet and maximum discharge capacity of 4400 cubic feet per second. Despite its critical function in flood risk reduction, the dam's condition assessment is currently listed as "Not Available," highlighting the need for regular inspections to ensure its continued effectiveness in safeguarding the community.

With its strategic location and significant role in flood risk management, Monroe Street Dam stands as a crucial infrastructure asset in the region. As climate change continues to pose challenges for water resources and extreme weather events become more frequent, the proper maintenance and monitoring of this dam are essential to safeguarding the community and preserving the integrity of the surrounding environment.

Year Completed

1991

Dam Length

610

Dam Height

16

River Or Stream

TRIB SPRING CREEK

Primary Dam Type

Earth

Drainage Area

26

Nid Storage

182

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

16
       
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.
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