Upper Sandusky Reservoir Dam Reservoir Report
Last Updated: December 21, 2025
The Upper Sandusky Reservoir Dam, also known as No.
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Summary
1, is a crucial structure located in Monocue, Ohio, that serves as a water supply source for the region. Constructed in 1957 by MADISON ENGINEERING ASSOCIATES, this earth dam stands at a height of 31 feet and stretches for 1600 feet, with a storage capacity of 850 acre-feet. Situated on a tributary to the Sandusky River, this dam is regulated by the Department of Natural Resources in Ohio, ensuring its safety and compliance with state regulations.
Despite its importance for water supply, the Upper Sandusky Reservoir Dam has been assessed as being in poor condition, with significant hazard potential. The dam has a normal storage capacity of 455 acre-feet and a drainage area of 1.38 square miles, making it a critical component of the local water infrastructure. With a maximum discharge capacity of 1650 cubic feet per second, the dam plays a crucial role in managing water flow and ensuring water availability for the community.
The dam's last inspection took place in June 2018, highlighting the need for ongoing maintenance and monitoring to address its poor condition. As a key water resource structure in the area, the Upper Sandusky Reservoir Dam is essential for water supply and flood control, underscoring the importance of investing in its upkeep and compliance with safety standards to safeguard the surrounding environment and community.
Year Completed |
1957 |
Dam Length |
1600 |
Dam Height |
31 |
River Or Stream |
TRIBUTARY TO SANDUSKY RIVER |
Primary Dam Type |
Earth |
Surface Area |
38 |
Drainage Area |
1.38 |
Nid Storage |
850 |
Hazard Potential |
Significant |
Nid Height |
31 |
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.
Upper Sandusky Reservoir Dam