Blanchester Reservoirs No. 1 & 2 Dam Reservoir Report

Last Updated: December 5, 2025

Blanchester Reservoirs No.


°F

°F

mph

Wind

%

Humidity

Summary

1 & 2 Dam, located in Blanchester, Ohio, was completed in 1924 with a primary purpose of providing water supply to the area. The dam is owned by the local government and is regulated by the Department of Natural Resources in Ohio. Standing at a height of 10.4 feet and with a length of 2585 feet, the dam has a storage capacity of 68 acre-feet and a surface area of 7.1 acres. Despite its fair condition assessment, the dam has a significant hazard potential, requiring inspections every five years to ensure its safety and functionality.

The dam is classified as an earth dam and serves an offstream water source for the community. With a drainage area of 0.01 square miles, the dam plays a crucial role in water management in the region. While it has not undergone significant modifications over the years, regular inspections are conducted to monitor its condition and address any potential risks. The emergency action plan for the dam was last revised in May 2020, indicating a proactive approach to emergency preparedness and risk management.

Blanchester Reservoirs No. 1 & 2 Dam stands as a vital infrastructure for water resource management in Clinton County, Ohio. With its historical significance dating back to the early 20th century, the dam continues to play a crucial role in providing water supply to the local community. As climate change impacts water resources, the maintenance and monitoring of dams like Blanchester Reservoirs No. 1 & 2 become increasingly important to ensure water security and resilience in the face of changing environmental conditions.

Year Completed

1924

Dam Length

2585

Dam Height

10.4

River Or Stream

OFFSTREAM

Primary Dam Type

Earth

Surface Area

7.1

Drainage Area

0.01

Nid Storage

68

Hazard Potential

Significant

Nid Height

10
       
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.