Rolling Greens (Bethlehem Twp Det) Reservoir Report

Last Updated: December 6, 2025

Rolling Greens (Bethlehem Twp Det) is a vital flood risk reduction structure located in Bethlehem Township, Pennsylvania.


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Summary

Completed in 1986, this earth dam stands at a height of 12 feet and has a length of 375 feet, providing a storage capacity of 7.8 acre-feet. Situated along the TR NANCY RUN stream, this dam is under the regulatory oversight of the Pennsylvania Department of Environmental Protection, ensuring state permitting, inspection, and enforcement measures are in place to maintain its integrity.

With a hazard potential rated as high, Rolling Greens plays a crucial role in mitigating flooding risks in the region. Despite this, the condition assessment deems the structure as satisfactory, indicating it is currently able to perform its intended function effectively. Regular inspections are conducted to monitor its safety and functionality, with the most recent inspection carried out in January 2021, demonstrating a commitment to maintaining the dam's stability and resilience.

As an essential component of flood risk reduction efforts in Northampton County, Rolling Greens serves as a testament to the proactive measures taken by local government agencies to protect communities and infrastructure from potential water-related disasters. With a clear focus on public safety and environmental preservation, this dam stands as a crucial feature in the region's water resource management and climate resilience strategies, showcasing the importance of proactive infrastructure planning and maintenance in the face of changing climate conditions.

Year Completed

1986

Dam Length

375

Dam Height

12

River Or Stream

TR NANCY RUN

Primary Dam Type

Earth

Drainage Area

0.28

Nid Storage

7.8

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

12
       
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.