Hillsboro Upground Reservoir Reservoir Report

Last Updated: December 5, 2025

Hillsboro Upground Reservoir, also known as Harmony Lake, is a local government-owned water supply reservoir located in Rocky Fork, Ohio.


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Summary

Constructed in 1991 by Woolpert Consultants, this earth dam stands at a height of 48 feet and spans 4100 feet in length. With a storage capacity of 592.7 acre-feet, this reservoir primarily serves as a crucial water source for the surrounding area.

Managed by the Department of Natural Resources in Ohio, the Hillsboro Upground Reservoir plays a vital role in ensuring water supply for the community. However, with a significant hazard potential and a poor condition assessment reported in 2018, there is a pressing need for regular inspections and maintenance to address any potential risks or issues. Despite these challenges, the reservoir continues to be a key asset in meeting the water needs of Highland County.

With its scenic location and essential role in water supply, the Hillsboro Upground Reservoir is a noteworthy structure in the region. As water resource and climate enthusiasts, it is important to recognize the significance of this reservoir in ensuring a sustainable water source for the community while also considering the need for ongoing maintenance and management to safeguard its integrity and functionality for the future.

Year Completed

1991

Dam Length

4100

Dam Height

48

River Or Stream

UNNAMED TRIBUTARY TO CLEAR CREEK

Primary Dam Type

Earth

Surface Area

19.8

Drainage Area

0.03

Nid Storage

592.7

Hazard Potential

Significant

Nid Height

48
       
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.