Mystic Lake Dam Reservoir Report
Last Updated: December 19, 2025
Mystic Lake Dam in Greene County, Ohio, is a private earth dam built in 1950 for recreational purposes.
°F
°F
mph
Wind
%
Humidity
Summary
Located in the city of GOES, the dam stands at a height of 12.3 feet and has a storage capacity of 64.8 acre-feet. The dam, which is regulated by the Ohio Department of Natural Resources, is situated on a tributary to the Little Miami River and covers a surface area of 6.6 acres.
Despite its low hazard potential, Mystic Lake Dam has been assessed to be in poor condition as of June 2019. The dam has a drainage area of 0.28 square miles and a maximum discharge capacity of 176 cubic feet per second. With a history of state permitting, inspection, and enforcement, Mystic Lake Dam remains an important structure for both water resource management and climate enthusiasts in the region.
As a recreational dam in Ohio, Mystic Lake Dam offers opportunities for outdoor activities and water-based recreation. Its proximity to the Little Miami River and its picturesque surroundings make it an ideal spot for nature lovers and adventure seekers. With ongoing monitoring and regulation by state agencies, Mystic Lake Dam continues to serve its purpose while ensuring public safety and environmental protection in the area.
Year Completed |
1950 |
Dam Length |
308 |
Dam Height |
12.3 |
River Or Stream |
TRIBUTARY TO LITTLE MIAMI RIVER |
Primary Dam Type |
Earth |
Surface Area |
6.6 |
Drainage Area |
0.28 |
Nid Storage |
64.8 |
Hazard Potential |
Low |
Nid Height |
12 |
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.
Mystic Lake Dam