Norwalk Upper Reservoir Reservoir Report
Last Updated: December 5, 2025
Norwalk Upper Reservoir, located in Huron County, Ohio, is a critical water supply infrastructure managed by the local government.
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Summary
Built in 1896, this Earth dam stands at a height of 39.4 feet and has a storage capacity of 853.9 acre-feet, serving the primary purpose of providing water to the surrounding area. The reservoir covers a surface area of 51 acres and is fed by Norwalk Creek, with a drainage area of 7.33 square miles.
With a maximum discharge capacity of 9,426 cubic feet per second, the dam's hazard potential is rated as high, prompting regular inspections and maintenance to ensure its structural integrity. The last inspection in October 2016 deemed the dam's condition as satisfactory, highlighting its importance in water resource management for the region. Despite its age, Norwalk Upper Reservoir continues to play a vital role in safeguarding water supply and supporting the local community's needs, under the oversight of the Department of Natural Resources in Ohio.
Year Completed |
1896 |
Dam Length |
2800 |
Dam Height |
39.4 |
River Or Stream |
NORWALK CREEK |
Primary Dam Type |
Earth |
Surface Area |
51 |
Drainage Area |
7.33 |
Nid Storage |
853.9 |
Hazard Potential |
High |
Nid Height |
39 |
Seasonal Comparison
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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.
Norwalk Upper Reservoir