Rolling Green Community Pond Reservoir Report

Last Updated: December 5, 2025

Rolling Green Community Pond in Allendale Estates, Maryland, is a privately-owned recreational water resource that has been serving the local community since its completion in 1965.


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Summary

With a dam height of 22 feet and a capacity of 53 acre-feet, this earth dam structure spans 200 feet and covers a surface area of 4.5 acres. The pond is fed by Cool Branch Run-TR and is regulated by the Maryland Dam Safety agency, ensuring its safety and maintenance for recreational activities.

Despite its age, Rolling Green Community Pond has undergone structural modifications in 2000 to enhance its stability and functionality. Regular inspections indicate a satisfactory condition assessment, with a significant hazard potential that is managed through moderate risk assessment measures. The pond has a spillway width of 40 feet and a maximum discharge capacity of 950 cubic feet per second, providing a reliable outlet for excess water during heavy rainfall events. Its location within Harford County, Maryland, makes it a valuable water resource for both residents and visitors to enjoy outdoor activities such as fishing, boating, and picnicking.

Overall, Rolling Green Community Pond stands as a well-maintained and regulated water resource that not only provides recreational opportunities but also contributes to the local ecosystem. With its serene surroundings and efficient management practices, the pond remains a popular destination for water resource and climate enthusiasts seeking to appreciate the importance of sustainable water infrastructure in a changing climate.

Years Modified

2000 - Structural

Year Completed

1965

Dam Length

200

Dam Height

22

River Or Stream

Cool Branch Run-TR

Primary Dam Type

Earth

Surface Area

4.5

Drainage Area

0.23

Nid Storage

53

Outlet Gates

Valve - 0

Hazard Potential

Significant

Foundations

Soil

Nid Height

22
       
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.