Green Lane Reservoir Reservoir Report

Last Updated: December 6, 2025

Green Lane Reservoir, located in Montgomery County, Pennsylvania, is a gravity dam completed in 1957 primarily for water supply purposes.


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Summary

With a height of 87 feet and a storage capacity of 25,114 acre-feet, this reservoir on the Perkiomen Creek serves as a vital source of water for the region. The dam is owned by a private entity but is regulated by the Pennsylvania Department of Environmental Protection, ensuring that it meets state inspection and enforcement standards.

Despite its age, Green Lane Reservoir maintains a satisfactory condition assessment and has a high hazard potential due to its location and storage capacity. The reservoir also offers recreational opportunities in addition to its water supply function, with a surface area of 814 acres for activities like boating and fishing. The dam's emergency action plan status and risk management measures are currently unspecified, highlighting the need for continued monitoring and maintenance to ensure the safety and sustainability of this essential water resource in the face of evolving climate challenges.

Year Completed

1957

Dam Length

780

Dam Height

87

River Or Stream

PERKIOMEN CREEK

Primary Dam Type

Gravity

Surface Area

814

Drainage Area

71

Nid Storage

25114

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

87
       
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.