Workman Lake Dam Reservoir Report
Last Updated: December 5, 2025
Workman Lake Dam, located in Knox County, Ohio, is a privately owned structure designed by the USDA's Soil Conservation Service.
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Summary
The dam, primarily used for recreation, stands at a height of 30.2 feet and has a storage capacity of 89.9 acre-feet. With a drainage area of 0.32 square miles, the dam serves as a tributary to the Kokosing River, providing essential water resources for the surrounding area.
Despite its significant hazard potential, Workman Lake Dam is currently in poor condition, as per its last inspection in November 2019. The dam has a history of modifications and is under state regulation, permitting, inspection, and enforcement. The Department of Natural Resources in Ohio oversees the regulatory aspects of the dam, ensuring its safety and compliance with state standards. With a risk assessment and emergency action plan in place, efforts are made to manage and mitigate potential risks associated with the dam.
Enthusiasts of water resources and climate will find Workman Lake Dam to be a fascinating structure with a rich history and vital role in the region's water management. As a key recreational site and a significant hydraulic feature, the dam showcases the intersection of human engineering and environmental conservation. Its condition and regulatory oversight demonstrate the ongoing efforts to balance water resource utilization with safety and sustainability in the face of changing climate patterns.
Dam Length |
420 |
Dam Height |
30.2 |
River Or Stream |
TRIBUTARY TO KOKOSING RIVER |
Primary Dam Type |
Earth |
Surface Area |
6.2 |
Drainage Area |
0.32 |
Nid Storage |
89.9 |
Hazard Potential |
Significant |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Workman Lake Dam