Mill Club Reservoir Report

Last Updated: December 5, 2025

Mill Club is a private water resource nestled in Radnor Township, Pennsylvania, along the picturesque Little Darby Creek.


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Summary

The dam, completed in 1908, stands at a height of 22 feet and spans 250 feet, creating a serene 2.5-acre surface area for recreational activities. With a primary purpose of recreation, Mill Club is regulated by the Pennsylvania Department of Environmental Protection and undergoes regular inspections to ensure safety and compliance.

Despite its fair condition assessment, the dam at Mill Club poses a significant hazard potential, highlighting the importance of proper risk management measures. The storage capacity of 58 acre-feet serves as a vital resource for the surrounding area, with a normal storage level of 28 acre-feet. The dam's existence adds to the natural charm of the Delaware County landscape, attracting water resource and climate enthusiasts seeking a tranquil retreat in the heart of Pennsylvania.

Mill Club's rich history and scenic location make it a captivating destination for those interested in water resources and climate. As the dam continues to serve its primary recreational purpose, efforts to maintain its safety and functionality underscore the vital role it plays in the local ecosystem. With the support of the Pennsylvania Department of Environmental Protection and ongoing inspections, Mill Club stands as a testament to the intersection of human ingenuity and environmental stewardship in the preservation of water resources.

Year Completed

1908

Dam Length

250

Dam Height

22

River Or Stream

LITTLE DARBY CREEK

Primary Dam Type

Earth

Surface Area

2.5

Drainage Area

1.6

Nid Storage

58

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

22
       
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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.