Leoni Dam Reservoir Report

Last Updated: December 5, 2025

Leoni Dam, located in Jackson, Michigan, is a local government-owned structure on Leoni Creek, completed in 1913 for recreational purposes.


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Summary

The earth dam stands at a height of 9.6 feet with a hydraulic height of 9.7 feet, offering a maximum storage capacity of 130 acre-feet and a normal storage of 42 acre-feet. The dam spans 325 feet in length and covers a surface area of 30 acres, serving as a popular spot for outdoor activities amidst a picturesque setting.

Despite its historical significance and recreational value, Leoni Dam has a poor condition assessment as of its last inspection in July 2015. Classified with a low hazard potential and moderate risk level, the dam is in need of attention to ensure its structural integrity and continued safe operation. While the dam has state regulation, inspection, and enforcement in place, ongoing maintenance and potential risk management measures are essential to address its current condition and ensure the safety of surrounding communities and the environment.

As water resource and climate enthusiasts, it is crucial to monitor the maintenance and risk management efforts for Leoni Dam to preserve its recreational benefits and prevent any potential hazards. With its location in a scenic area and vital role in providing water storage and regulation, stakeholders must prioritize the upkeep and safety of the dam to protect both the local ecosystem and the community's enjoyment of this historic water resource feature.

Year Completed

1913

Dam Length

325

Dam Height

9.6

River Or Stream

Leoni Creek

Primary Dam Type

Earth

Surface Area

30

Hydraulic Height

9.7

Drainage Area

16.5

Nid Storage

130

Structural Height

9.6

Hazard Potential

Low

Nid Height

10
       
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.