Happy Hills Lake Dam Reservoir Report
Nearby: Avis Dam Lake Hope Dam
Last Updated: December 27, 2025
Happy Hills Lake Dam in Coonville, Ohio, is a privately-owned structure designed by John Fuller and regulated by the Department of Natural Resources.
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Summary
Completed in 1954, this earth dam stands at a height of 43.8 feet and serves primarily for recreational purposes, with a storage capacity of 66.3 acre-feet. Situated on a tributary to East Branch Raccoon Creek, the dam poses a significant hazard potential with a poor condition assessment as of its last inspection in November 2016.
Despite its poor condition, Happy Hills Lake Dam continues to attract water resource and climate enthusiasts due to its picturesque location and the recreational opportunities it offers. Its proximity to Huntington District and the oversight of the state regulatory agency ensure the safety of the surrounding community and the preservation of the dam's integrity. However, with no recent modifications or risk assessment data available, the future maintenance and management of this dam remain uncertain, prompting further attention from stakeholders and authorities to prevent any potential hazards or environmental risks.
Year Completed |
1954 |
Dam Length |
395 |
Dam Height |
43.8 |
River Or Stream |
TRIBUTARY TO EAST BRANCH RACCOON CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.5 |
Drainage Area |
0.02 |
Nid Storage |
66.3 |
Hazard Potential |
Significant |
Nid Height |
44 |
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.
Happy Hills Lake Dam