Walnut Hills Lake Dam Reservoir Report

Last Updated: December 5, 2025

Walnut Hills Lake Dam in Ohio is a privately owned structure that serves primarily for recreational purposes.


°F

°F

mph

Wind

%

Humidity

Summary

With a height of 24 feet and a length of 440 feet, this earth dam holds a storage capacity of 28.1 acre-feet and covers a surface area of 3.5 acres. Located in OREGONIA, in Warren County, Ohio, the dam is regulated by the Department of Natural Resources and undergoes regular inspections to ensure its safety and compliance with state regulations.

Despite its significant hazard potential and poor condition assessment, Walnut Hills Lake Dam continues to be a popular spot for water resource and climate enthusiasts. Its proximity to the TRIBUTARY TO NORTH FORK river, along with its recreational facilities, makes it a valuable asset to the community. However, given its condition, there may be a need for increased maintenance and potential risk management measures to ensure the continued safety and functionality of the dam for future generations.

With a last inspection date in July 2019 and an inspection frequency of 5 years, stakeholders and local authorities must stay vigilant in monitoring the dam's integrity and addressing any concerns promptly. As climate change continues to impact water resources, infrastructure like Walnut Hills Lake Dam plays a crucial role in managing water flow and providing recreational opportunities. By staying proactive in maintenance and risk management, this dam can continue to serve its purpose effectively while safeguarding the surrounding environment and community.

Dam Length

440

Dam Height

24

River Or Stream

TRIBUTARY TO NORTH FORK

Primary Dam Type

Earth

Surface Area

3.5

Drainage Area

0.56

Nid Storage

28.1

Hazard Potential

Significant

Nid Height

24
       
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.