New London Reservoir Reservoir Report

Last Updated: December 5, 2025

New London Reservoir, located in Huron County, Ohio, is a vital water source managed by the local government.


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Summary

Built in 1975, this Earth type dam stands at a height of 39 feet and boasts a storage capacity of 5,365 acre-feet, providing water supply for the surrounding area. The reservoir covers a surface area of 220 acres and is regulated by the Ohio Department of Natural Resources, ensuring proper inspection, permitting, and enforcement measures are in place.

With a moderate risk assessment rating, the dam's condition was deemed satisfactory during the last inspection in October 2016. Despite its high hazard potential, the reservoir has an uncontrolled spillway and outlet gates, with emergency action plans in place. The surrounding area is at risk of inundation in the event of a breach, highlighting the importance of proper risk management and maintenance practices. Enthusiasts of water resources and climate will appreciate the role that New London Reservoir plays in supporting the region's water supply needs while also recognizing the ongoing efforts to ensure its safety and sustainability.

Year Completed

1975

Dam Length

11805

Dam Height

39

River Or Stream

VERMILION RIVER - OFFSTREAM

Primary Dam Type

Earth

Surface Area

220

Drainage Area

0.36

Nid Storage

5365

Outlet Gates

Uncontrolled

Hazard Potential

High

Foundations

Soil

Nid Height

39
       
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.