Pole Run No 4 Reservoir Report

Last Updated: December 7, 2025

Pole Run No 4 is a significant structure located in Mahanoy Township, Schuylkill County, Pennsylvania, managed by the local government for water supply purposes.


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Summary

Built in 1877, this earth dam stands at a height of 41.5 feet, with a storage capacity of 192 acre-feet. The dam overlooks the Pole Run river and has a drainage area of 0.58 square miles, serving as a vital resource for the surrounding community.

Despite its age, Pole Run No 4 has undergone modifications in 2004 and 2009 to ensure its continued functionality and safety. The dam has a high hazard potential but is currently assessed as being in satisfactory condition. Regular inspections are conducted, with the last one taking place in November 2020, to monitor its structural integrity and address any potential risks. The Pennsylvania Department of Environmental Protection oversees the regulatory aspects of the dam, including permitting, inspection, and enforcement, ensuring compliance with state guidelines.

For water resource and climate enthusiasts, Pole Run No 4 represents a historical and essential infrastructure that plays a crucial role in providing water supply to the local community. Its presence highlights the importance of proper dam management and maintenance to ensure the safety and sustainability of water resources in the region. As climate change continues to impact water availability and distribution, structures like Pole Run No 4 serve as vital assets in managing and conserving this precious resource for future generations.

Years Modified

2004 - Other, 2009 - Other

Year Completed

1877

Dam Length

750

Dam Height

41.5

River Or Stream

POLE RUN

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.58

Nid Storage

192

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

42
       
Seasonal Comparison

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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.