Green Lake Dam Reservoir Report
Last Updated: December 19, 2025
Green Lake Dam, located in North Greenfield, Ohio, is a privately owned structure designed by Buckeye Engineering, Ltd.
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Summary
The dam was completed in 2002 and stands at a height of 25 feet with a length of 480 feet. Its primary purpose is for recreation, providing a maximum storage capacity of 371.3 acre-feet and a normal storage capacity of 253.9 acre-feet. The dam sits on an unnamed tributary to Mill Creek, with a low hazard potential and a satisfactory condition assessment as of November 2020.
Managed by the Department of Natural Resources in Ohio, Green Lake Dam is regulated, permitted, inspected, and enforced by the state authorities. The dam features a surface area of 42.9 acres and a drainage area of 0.28 square miles. With a maximum discharge rate of 270 cubic feet per second, the dam ensures the safety of the surrounding area in case of emergencies. The dam is not under the jurisdiction of the US Army Corps of Engineers and has not undergone any modifications since its completion.
Green Lake Dam offers a serene recreational spot for water resource and climate enthusiasts in Logan County, Ohio. With its picturesque setting and reliable structural integrity, the dam provides a safe and enjoyable environment for outdoor activities such as fishing, boating, and picnicking. Its low hazard potential and satisfactory condition assessment make it a popular destination for visitors seeking to connect with nature and enjoy the beauty of the surrounding landscape.
Year Completed |
2002 |
Dam Length |
480 |
Dam Height |
25 |
River Or Stream |
UNNAMED TRIBUTARY TO MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
42.9 |
Drainage Area |
0.28 |
Nid Storage |
371.3 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Green Lake Dam