Allen No. 1 Dam Reservoir Report
Last Updated: December 5, 2025
Allen No.
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Summary
1 Dam, located in Milligan, Ohio, is a privately owned structure completed in 1981 for the primary purpose of recreation. Standing at a height of 58.8 feet and with a length of 600 feet, this earth dam boasts a storage capacity of 53.8 acre-feet and a surface area of 3 acres. The dam is situated on a tributary to Moxahala Creek and falls under the jurisdiction of the Department of Natural Resources in Ohio.
Despite its fair condition assessment as of September 2018, the dam poses a high hazard potential, emphasizing the importance of regular inspections and maintenance to ensure public safety. With a maximum discharge capacity of 214 cubic feet per second, it is crucial for the state regulatory agency to uphold its permitting, inspection, and enforcement responsibilities. The dam's impact on the surrounding environment and potential risks underscore the need for a comprehensive emergency action plan to be in place.
Water resource and climate enthusiasts monitoring Allen No. 1 Dam should take note of its historical significance as part of the local recreational infrastructure. With its relatively small drainage area of 0.02 square miles, the dam plays a critical role in managing water resources in the region. As efforts continue to assess and mitigate risks associated with the dam, stakeholders must remain vigilant in safeguarding this essential structure for both recreational and environmental purposes.
Year Completed |
1981 |
Dam Length |
600 |
Dam Height |
58.8 |
River Or Stream |
TRIBUTARY TO MOXAHALA CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.02 |
Nid Storage |
53.8 |
Hazard Potential |
High |
Nid Height |
59 |
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.
Allen No. 1 Dam