Germantown Dam Reservoir Report

Last Updated: December 5, 2025

Germantown Dam, located in Montgomery, Ohio, along the Twin Creek, was completed in 1922 by the Miami Conservancy District for the primary purpose of flood risk reduction.


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Summary

This earth dam stands at a height of 107 feet and has a length of 1210 feet, providing a storage capacity of 142,000 acre-feet. With a drainage area of 275 square miles, the dam plays a crucial role in managing the flow of water and reducing the risk of flooding in the region.

Managed by the local government, Germantown Dam is regulated by the Ohio Department of Natural Resources, ensuring regular inspections and enforcement to maintain its structural integrity. The dam has a high hazard potential but is currently assessed to be in fair condition as of the last inspection in March 2016. While there are no associated structures or locks, the dam serves as a vital infrastructure for flood control in the area, protecting downstream communities and land from potential water damage.

Water resource and climate enthusiasts would be intrigued by Germantown Dam's historical significance and engineering marvel in flood risk reduction. Its location along the Twin Creek and the collaboration between local and state agencies for regulation and maintenance make it a noteworthy site for understanding water management practices. With its high hazard potential and importance in the region's water infrastructure, Germantown Dam stands as a testament to the ongoing efforts to balance water resource management and environmental conservation for sustainable development.

Year Completed

1922

Dam Length

1210

Dam Height

107

River Or Stream

TWIN CREEK

Primary Dam Type

Earth

Drainage Area

275

Nid Storage

142000

Hazard Potential

High

Nid Height

107
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.