Heritage Glen Dam Reservoir Report

Last Updated: December 5, 2025

Heritage Glen Dam, also known as Heritage Glen Swm Pond 2, is a local government-owned structure located in New Orchard Estates, Prince George's County, Maryland.


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Summary

Completed in 2004, this earth dam stands at a height of 12 feet and spans 260 feet in length, with a primary purpose of flood risk reduction along the Southwest Branch-TR river or stream. The dam has a normal storage capacity of 0.33 acre-feet and is regulated by the Maryland Dam Safety agency.

With a significant hazard potential and a satisfactory condition assessment as of April 2021, Heritage Glen Dam is equipped with an uncontrolled spillway, valve outlet gates, and a maximum discharge capacity of 750 cubic feet per second. The dam's risk assessment deems it as moderate, with inspections conducted every 3 years to ensure its structural integrity and operational effectiveness. While the dam has not been modified in recent years, it plays a crucial role in mitigating flood risks and safeguarding the surrounding community from potential inundation events.

Year Completed

2004

Dam Length

260

Dam Height

12

River Or Stream

Southwest Branch-TR

Primary Dam Type

Earth

Surface Area

0.25

Drainage Area

0.06

Nid Storage

5

Outlet Gates

Valve - 0

Hazard Potential

Significant

Foundations

Soil

Nid Height

12
       
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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.