Monon Reservoir Dam Reservoir Report

Last Updated: December 20, 2025

Monon Reservoir Dam, located in Greene, Indiana, was completed in 1915 and serves as a vital water resource for the region.


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Summary

The dam, standing at a height of 19.9 feet and with a length of 550 feet, has a storage capacity of 58 acre-feet and covers a surface area of 5.28 acres. While it is primarily categorized as an Earth dam, its primary purpose goes beyond flood control and water storage, making it a unique and important structure in the area.

Despite its age, Monon Reservoir Dam has been deemed to have a low hazard potential. However, its condition assessment is listed as poor, highlighting the need for potential improvements or maintenance measures. The last inspection of the dam was conducted in July 2001, indicating a significant gap in monitoring and upkeep. With its historical significance and importance as a water resource, ensuring the safety and stability of Monon Reservoir Dam is crucial for the surrounding community and the environment.

As a private-owned structure not regulated by the state, the responsibility for the upkeep and maintenance of Monon Reservoir Dam falls on its owners. With its poor condition assessment and outdated inspection records, there is a pressing need for renewed attention and potential upgrades to ensure the long-term integrity of the dam. Water resource and climate enthusiasts should keep a watchful eye on the future developments and maintenance efforts surrounding this significant piece of infrastructure in Indiana.

Year Completed

1915

Dam Length

550

Dam Height

19.9

Primary Dam Type

Earth

Surface Area

5.28

Drainage Area

0.25

Nid Storage

58

Hazard Potential

Low

Nid Height

20
       
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.