Jonay Pond Dam Reservoir Report

Last Updated: December 19, 2025

Jonay Pond Dam, located in Sullivan, Indiana, stands as a testament to engineering excellence since its completion in 1947.


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Summary

This private-owned structure serves a variety of purposes, with a primary focus on water resource management. The dam is classified as an Earth type, standing at a height of 11 feet with a length of 987 feet, providing a storage capacity of 107 acre-feet.

With a low hazard potential and a condition assessment of "Not Rated," Jonay Pond Dam remains a crucial component of the local water infrastructure. Despite not being state-regulated, the dam plays a significant role in controlling water flow and ensuring the stability of the surrounding environment. Its location in Congressional District 08, Indiana, further highlights its importance in the region's water resource management.

While the last inspection dates back to 1990, the dam continues to provide reliable water storage and management capabilities. With a maximum discharge capacity of 113 cubic feet per second and a surface area of 11.97 acres, Jonay Pond Dam represents a vital asset for climate enthusiasts and water resource professionals alike, showcasing the intersection of human ingenuity and environmental stewardship in maintaining a sustainable water supply for the community.

Year Completed

1947

Dam Length

987

Dam Height

11

Primary Dam Type

Earth

Surface Area

11.97

Hydraulic Height

11

Drainage Area

0.45

Nid Storage

107

Structural Height

11

Hazard Potential

Low

Nid Height

11
       
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.