Dunmore No 1 Reservoir Report

Last Updated: December 7, 2025

Dunmore No 1, a private water supply dam located in Lackawanna, Pennsylvania, stands as a testament to engineering excellence since its completion in 1877.


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Summary

With a primary purpose of providing water supply, this earth dam boasts a height of 47 feet and a length of 400 feet, allowing for a storage capacity of 603 acre-feet. Situated on the Little Roaring Brook, the dam serves as a crucial resource for the surrounding community, with a normal storage capacity of 230 acre-feet and a surface area of 23 acres.

Despite its age, Dunmore No 1 has been maintained in fair condition, with a high hazard potential due to its location. Regular inspections by the Pennsylvania Department of Environmental Protection ensure the dam's structural integrity and operational efficiency are upheld. In 2006, the dam underwent modifications to enhance its safety and performance, reflecting a commitment to ensuring the continued reliability of this vital water resource infrastructure. As a key component of the local water supply system, Dunmore No 1 plays a crucial role in meeting the water needs of the region, highlighting the importance of effective dam management and regulation in safeguarding water resources in the face of changing climate conditions.

Years Modified

2006 - Other

Year Completed

1877

Dam Length

400

Dam Height

47

River Or Stream

LITTLE ROARING BROOK

Primary Dam Type

Earth

Surface Area

23

Drainage Area

4.5

Nid Storage

603

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

47
       
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.